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Ankle impingement

74 citationsUpdated Sep 2026

Overview

Ankle impingement is an increasingly recognized cause of symptoms in athletic populations [1]. While further study is needed to confirm current understanding of anterior ankle impingement and to better define treatment options and prevention strategies [2], arthroscopic debridement remains the gold standard for its management [9]. Arthroscopic treatment for anterior ankle impingement provides good outcomes regarding patient satisfaction and low complication rates [5]. In cases of bony ankle impingement associated with poorly tolerated range of motion restriction, simple arthroscopic surgical techniques improve both pain and joint mobility [4]. Intraosseous nerve ablation (IONA) treatment of anterior ankle impingement results in significant pain reduction, a low complication rate, and excellent patient-reported outcomes with high rates of return to work or sport [15].

Posterior ankle impingement is effectively managed with arthroscopic techniques, which are minimally invasive and especially suitable for athletes desiring an early return to previous sports activity [10]. Long-term outcomes of endoscopic treatment for posterior ankle impingement demonstrate good results, including high patient satisfaction, good functional outcome scores, and a low rate of recurrence across all types of posterior ankle impingement [12]. Hindfoot arthroscopic surgery is a safe and effective treatment strategy for posterior ankle impingement syndrome [35]. This technique allows for the identification of various pathologies beyond the common Posterior Ankle Impingement Syndrome [6]. In cases of symptomatic posterior ankle impingement, a PIM view can be used instead of or in addition to the standard lateral view for detection of posterior talar pathologic conditions [7]. Posterior ankle endoscopy in the supine position is a safe and effective approach, particularly when concomitant anterior ankle pathology requires anterior arthroscopy, allowing treatment of both pathologies without changing patient position [26]. A notable proportion of pediatric patients with posterior ankle impingement avoid surgery through conservative management [19].

Arthroscopic decompression is a safe and effective technique for treating medial ankle impingement after total ankle arthroplasty, offering advantages such as earlier weightbearing, faster recovery, and less risk of periprosthetic infection compared to open procedures [64]. Combined treatment of chronic ankle instability and anterior ankle impingement produces satisfactory surgical outcomes in patients with chronic ankle instability accompanied by anterior ankle impingement symptoms [3]. Complex ankle bony impingement combined with lateral instability can yield good clinical results when treated surgically with both ankle stabilization and osteophyte removal [11]. Operative procedures that only focus on part of the pathology should be approached with caution until assessment of a patient with ankle instability defines all deficiencies [22]. Arthroscopic treatment of ankle instability is emerging as the potential gold standard technique, offering the advantage of addressing both instability and associated intra-articular pathology in a single procedure with excellent results [69]. Arthroscopic ankle stabilisation repair and reconstruction techniques hold considerable promise but require further evaluation to better determine the indications of repair versus reconstruction and to obtain information on long-term outcomes [62].

Anatomy & Pathophysiology

Bony Anatomy

The ankle mortise is formed by the tibial plafond, medial malleolus, and lateral malleolus, which articulates with the dome of the talar body [70]. The talar dome is wider anteriorly and narrower posteriorly [70]. During motion from plantar flexion to dorsiflexion, the ankle mortise widens 1 to 1.5 mm, causing medial and superior clear spaces to appear wider with the foot in plantar flexion [70]. The ankle joint is responsible for most sagittal plane motion of the foot and ankle, with a range of motion including 23 to 48 degrees of plantar flexion and 10 to 23 degrees of dorsiflexion [70]. The distal fibula has a convex medial surface that articulates with the concave incisura fibularis of the distal lateral tibia [70]. The fibula rotates approximately 2 degrees within the incisura during ankle motion and ambulation, with dorsiflexion resulting in external rotation and proximal translation of the fibula [70].

Ligamentous Anatomy

The lateral ankle ligaments function as restraints to varus and inversion forces at the ankle [70]. The anterior talofibular ligament (ATFL) originates from the anteroinferior aspect of the lateral malleolus, 1 cm proximal to its tip, and extends to the lateral aspect of the talar neck [70]. The calcaneofibular ligament (CFL) extends from the tip of the lateral malleolus to the lateral aspect of the calcaneus, while the posterior talofibular ligament (PTFL) extends from the posterior lateral malleolus to the posterolateral talus [70]. The ATFL is the weakest ankle ligament, whereas the PTFL is the strongest [70]. The distal tibiofibular joint and fibula provide stability against lateral talar translation [70].

The deltoid ligament consists of superficial and deep layers, with the deep portion organized into anterior and posterior deep tibiotalar ligaments [76]. The deep deltoid ligament extends from the apex of the medial malleolus to the medial talar body and functions primarily to resist lateral talar translation and external rotation [70]. The posterior deep deltoid ligament is the most important component of the deltoid complex [70], and the deep posterior tibiotalar ligament is the strongest component of the deltoid complex [76]. The deep deltoid ligament has the highest load to failure at 713.8 N ± 69.3 compared with the lateral collateral ligaments [76]. The dominant mode of failure for the deep deltoid ligament is an intrasubstance rupture near its talar insertion, while the dominant mode of failure for the superficial deltoid ligament is at its insertion on the anterior malleolus [76]. The superficial deltoid ligament extends from the distal medial malleolus to the navicular bone, sustentaculum tali of calcaneus, medial talus, and spring ligament, functioning primarily to resist valgus and eversion ankle forces [70]. The anterior tibiofibular ligament has a constant distal fascicle that contacts the anterolateral part of the talus in the neutral position and in plantar flexion [105].

Pathophysiology of Impingement

Initial impingement syndromes about the ankle involved bony impingement resulting from osteochondral ridges proximal to the anterior lip of the distal tibia or on the dorsum of the talar neck [8]. Bony impingement is usually seen in athletes whose sports require repetitive excessive dorsiflexion and plantar flexion or abrupt acceleration and jumping [8]. Extremes of forceful dorsiflexion or plantar flexion produce progressive traction osteophytes adjacent to the capsular ligament attachments while sparing the articular cartilage [8]. Osseous exostoses can be attributed to recurrent direct injuries during forced dorsiflexion where the sulcus of the talus impinges on the anterior rim of the tibia [8]. Repetitive pull of the joint capsule and continuous impingement of the dorsal articular surface of the talus against the tibia lead to calcific deposits along capsular fibers and osteophyte formation [8].

Anterior ankle impingement can be caused by anterior tibial and talar osteophytes and by anterior soft tissue that becomes compressed with dorsiflexion of the ankle [33]. Anterolateral soft-tissue impingement is characterized by hypertrophic synovium, inflamed or enlarged capsular tissues, and scarring [60]. This impingement occurs primarily at the superior portion of the anterior talofibular ligament and along the distal portion of the anterior-inferior tibiofibular ligament [60]. Anterolateral soft tissue impingement can be associated with intra-articular lesions such as a mass of hyalinized scar tissue obstructing the lateral talofibular articulation [8]. This hyalinized scar tissue, named a "meniscoid lesion," was described in patients with persistent symptoms after an inversion injury [8]. Inflammation within the ankle joint often becomes chronic as a result of repeated injury [108]. Recurrent ankle sprains can cause repeated hemorrhage into the joint, leading to synovitis and subsequent scarring of the ligaments [108].

Ankle impingement most commonly is anterolateral [108]. Thickening of the ATFL or the inferior most portion of the AITFL and surrounding soft tissues is the most common cause of anterolateral impingement [108]. The Bassett ligament, an accessory band of the AITFL, and extensor tendons can be sources of soft-tissue impingement in the anterior ankle [108]. The accessory anteroinferior tibiofibular ligament can cause talar impingement [8]. Posttraumatic anterolateral hyperlaxity due to an injured ATFL can result in anterior extrusion of the talar dome with dorsiflexion, contacting the inferior fascicle of the AITFL [21]. Variations in width, length, and obliquity of the AITFL fascicle may be related to its pathological behavior [21]. Wider and longer AITFL fascicles have more potential to become pathological than thinner ones [21]. If the fibular insertion point of the AITFL is far from the joint level, the fascicle has more potential to become pathological [21]. Ankle instability can occur without ligamentous issues, including due to anterior ankle impingement [41].

Posterior soft-tissue impingement results from repeated plantar flexion that traps tissue between the calcaneus and the tibia [108]. Stenosing tenosynovitis of the flexor hallucis longus, hypertrophy of the posterior capsule, and enlargement of the posterior intermalleolar ligament are common causes of posterior soft-tissue impingement [108]. Posterior ankle impingement is caused by irritation of posterior structures, usually as a result of compression in maximum plantar flexion [37]. Bony posterior impingement may involve the posterior malleolus, posterolateral talar process, os trigonum, posterior subtalar joint, or posterior calcaneal tuberosity [37]. The os trigonum and posterolateral tubercle are most commonly involved in posterior impingement syndrome [37]. Posterior impingement is seen in athletes who extensively use the extreme plantarflexed position, such as in dance, kicking, and jumping sports [37].

Injury to the ankle syndesmosis can result in persistent pain and dysfunction secondary to syndesmotic impingement [88]. Syndesmotic impingement most often involves the anterior tibiofibular ligament, with resulting synovitis and scarring [88]. The presence of a separate anterior-inferior tibiofibular ligament fascicle (Bassett ligament) may contribute to syndesmotic impingement [88].

Classification

Anterior Impingement

Anterior ankle impingement syndrome is hypothesized to result from direct damage to the ankle cartilage rim, leading to reactive spur formation [43]. The condition was initially described as bony impingement caused by osteochondral ridges forming proximal to the anterior lip of the distal tibia or on the dorsum of the talar neck [8]. While extremes of forceful dorsiflexion or plantar flexion produce progressive traction osteophytes adjacent to capsular ligament attachments while sparing articular cartilage [8], O’Donoghue and Tol et al attributed osseous exostoses to recurrent direct injuries during forced dorsiflexion where the talar sulcus impinges on the tibial anterior rim [8]. Parkes et al advocated that repetitive capsule pull and continuous dorsal talar-tibial impingement in running and jumping lead to calcific deposits along capsular fibers and osteophyte formation [8]. Arthroscopic resection of anterior bony spurs yields favorable outcomes, particularly in patients with less than 2 years of ankle pain and anteromedially located exostoses [8]. Anterolateral soft tissue impingement may be associated with various intra-articular lesions [8]. Wolin et al described a "meniscoid lesion," a mass of hyalinized scar tissue obstructing the lateral talofibular articulation, in 9 patients with persistent anterolateral symptoms following inversion injury [8].

Post-traumatic anterior impingement can also be caused by web-like intra-articular fibrous bands resulting from ankle distortion [27, 46]. These transarticular fibrous strands may be induced by intra-articular blood accumulation after trauma [46]. Clinicians must differentiate these post-traumatic bands from a distal or associated fascicle of the antero-inferior tibiofibular ligament, as the incidence of this accessory fascicle varies widely and may represent a normal finding [46].

Posterior Impingement

The posterior surgical approach allows for the identification of various pathologies beyond common Posterior Ankle Impingement Syndrome [6]. For symptomatic cases, a PIM view is advised instead of or in addition to the standard lateral view to detect posterior talar pathologic conditions [7]. In ballet dancers, bony impingement was the major pathological process, related in more than 90 percent of patients with posterior ankle impingement syndrome [20]. Surgical treatment via both open and endoscopic procedures yields good results, with no difference found in patient satisfaction between the two approaches [38]. However, complication rates are considerably lower for endoscopic procedures (15.9% v 7.3%) compared to open procedures [38]. Major complication rates are also lower for endoscopic procedures (5.4%) compared to open procedures (13.8%) [38]. The time required to return to full activity appears shorter in the endoscopic group (weighted mean, 7.8 weeks) compared to the open group (weighted mean, 16.0 weeks) [38].

Lateral and Combined Impingement

Antero-lateral ankle impingement syndrome is closely linked to anterior talo-fibular ligament injury and, in some patients, to chronic ankle instability [17]. MCL insufficiency resulted from medial ankle instability and medial impingement lesions [14]. The accessory anteroinferior tibiofibular ligament can cause talar impingement [8]. Bassett et al postulated that posttraumatic anterolateral hyperlaxity due to an injured ATFL results in anterior extrusion of the talar dome with dorsiflexion, increasing pressure and friction against the inferior fascicle of the AITFL [21]. Akseki et al stated that variations in width, length, and obliquity of the AITFL fascicle may relate to its pathological behavior [21]. Mean width and length of the AITFL fascicle with bending during dorsiflexion and dorsiflexion-eversion were significantly higher than the fascicle without bending [21]. Wider and longer AITFL fascicles had more potential to become pathological than thinner ones [21]. Two distinct ATFL fascicles may be identified in the majority of ankles on MRI [44].

Preoperative ankle arthroscopy reveals that abnormalities of different structures are involved in chronic ankle instability with no single causal entity [28]. One in three patients with chronic lateral ankle instability has a cartilage lesion [144]. The endoscopic approach for lateral ankle instability allows assessment of the ankle joint and treatment of associated intra-articular lesions [40]. This arthroscopic classification of chronic ATFL lesions confirms the diagnostic role for arthroscopy in assessing ligaments in patients with CAI and helps determine the best surgical technique for stabilizing the ankle [104]. Ankle arthroscopy was performed more frequently in female patients and most commonly in patients younger than 50 years, with a significant increase in its use for lateral ankle instability management [13].

General Diagnostic and Clinical Principles

The clinical examination remains the key stage in managing foot and ankle disorders, avoiding the sequence 'symptom → IRM → surgical indication' and enabling the construction of a simple and logical pathogenic causal sequence to develop an appropriate treatment plan [16]. Ankle arthroscopy is a very effective method for the diagnostic of ankle OLTs and other intraarticular pathologies [130]. This international consensus derived from leaders in the field will assist clinicians with the appropriate terminology for osteochondral lesions of the ankle [117].

Other Considerations: Manual stress testing is a valuable method for identifying mechanical ankle instability but may overvalue patient-reported instability due to its subjective character [36]. 3D stress MRI and stress sonography represent valuable alternatives for quantitatively assessing mechanical ankle instability in research and practice [36]. The literature would benefit greatly from the standardization of the definition of ankle instability treatment failure [45].

Clinical Presentation

Anterior Ankle Impingement

Anterior ankle impingement syndrome stems from direct damage to the ankle cartilage rim, leading to reactive spur formation [43]. Repetitive excessive dorsiflexion and plantar flexion, or abrupt acceleration and jumping, are associated with the formation of osteochondral ridges proximal to the anterior lip of the distal tibia or on the dorsum of the talar neck [8]. Extremes of forceful dorsiflexion or plantar flexion produce progressive traction osteophytes adjacent to capsular ligament attachments while sparing the articular cartilage [8]. An accessory anteroinferior tibiofibular ligament can cause talar impingement [8]. Posttraumatic anterolateral hyperlaxity due to an injured ATFL may result in anterior extrusion of the talar dome with dorsiflexion, contacting the inferior fascicle of the AITFL [21].

Anterolateral soft tissue impingement is a common cause of chronic pain after one or more lateral ankle sprains [60]. Patients typically report a history of persistent anterolateral ankle pain with activity [60]. Physical examination notes well-localized tenderness at the anterolateral ankle joint [60]. A specific test involves reproduction of pain with plantar flexion of the ankle, followed by thumb pressure at the anterolateral ankle joint, and dorsiflexion of the ankle [60]. Clinical examination has a reported sensitivity of 94% and specificity of 75% for this condition [60]. In contrast, conventional MRI has a reported sensitivity and specificity of less than 50% for anterolateral soft tissue impingement [60].

Posterior Ankle Impingement

Posterior ankle impingement is caused by irritation of the posterior structures of the ankle, usually as a result of compression in maximum plantar flexion [37]. This syndrome results from recurrent trauma to the posterior ankle capsuloligamentous complex, flexor hallucis longus tendon, and/or os trigonum [31]. Bony posterior ankle impingement may involve the posterior malleolus, the posterolateral talar process (trigonal or Stieda process), an os trigonum, the posterior subtalar joint, or the posterior calcaneal tuberosity [37]. The os trigonum and the posterolateral tubercle are most commonly involved in posterior impingement syndrome [37]. Bony impingement was the major pathological process in more than 90 percent of ballet dancers with posterior ankle impingement syndrome [20]. PAIS is observed in athletes in many sports, is caused mainly by bony impingement, and is often associated with FHL-related pathology [120].

Athletes with posterior impingement report a deep pain anterior to the Achilles tendon during specific activities such as jumping, kicking, or a push-off maneuver [37]. Patients occasionally describe pain or catching with firing of the flexor hallucis longus tendon [37]. A traumatic incident can be an inciting event, but symptoms are usually caused by overuse [37]. On clinical examination, patients with posterior ankle impingement syndrome due to symptomatic os trigonum experience pain on palpation of the posterior aspect of the ankle joint deep to the Achilles tendon [53]. A positive hyperplantarflexion test, defined as posterior ankle pain provoked by quick and repetitive hyperplantarflexion of the ankle with the patient sitting with the knee flexed at 90 degrees, is present in these patients [53].

General Clinical Assessment

The clinical examination remains the key stage in the management of disorders of the foot and the ankle, enabling the construction of a simple and logical pathogenic causal sequence to develop an appropriate treatment plan [16]. Clinicians must be vigilant and perform a thorough history and physical examination for ankle injuries and disorders [24]. Physical exam is the most important tool for diagnosis of ankle sprains [41]. Swelling, ecchymosis, and pain with weight bearing are common findings in ankle sprains [41]. Assessment for recurrent instability and questioning the patient about symptoms of a loose body or osteochondral injury (mechanical symptom such as locking or catching) are required in the evaluation of ankle sprains [41].

In the acute setting (0–2 days post-injury), pain and swelling might negatively affect the reliability of physical examination for lateral ankle ligament injuries [52]. The sensitivity of common clinical findings for lateral ankle ligament injuries increases in the delayed setting, resulting in improved diagnostic accuracy [52]. The initial diagnosis of posterior ankle impingement is based on patient history and physical examination [37]. Radiographs may reveal the presence of an os trigonum or posterior talar process in posterior ankle impingement [37]. MRI can detect the soft-tissue and bony edema that commonly occurs with posterior ankle impingement [37].

The use of advanced imaging is often helpful in diagnosis when combined with a thorough clinical examination [24]. MRI is typically reserved for patients with continued pain despite weeks of conservative treatment or concern about a loose body or osteochondral defect [41]. MRI may demonstrate attenuation or tear of the lateral ligamentous structures [41]. Bone bruising is common in severe ankle sprains and may result in longer time to pain-free activity and return to sports [41]. Preoperative ankle arthroscopy reveals abnormalities of different structures involved in chronic ankle instability, with no single causal entity [28].

Investigations

Clinical Examination: Patients with anterior ankle impingement present with pain localized to the anterior aspect of the ankle and tenderness at the anterior joint line [33]. Careful physical examination and diagnostic injection help pinpoint the diagnosis [33]. In lateral ankle instability, anterior drawer testing and talar tilt stress evaluate the competency of the anterior talofibular ligament and calcaneofibular ligament, respectively [83]. These patients require assessment for global ligamentous laxity and weight-bearing hindfoot alignment [83]. An ankle effusion may be present due to chronic instability, synovitis, or associated osteochondral lesions or loose bodies [83].

Plain radiography: Lateral radiographs may fail to show osteophytes associated with anterior ankle impingement; an anteromedial view is often helpful [33]. For lateral ankle instability, AP, mortise, and lateral weight-bearing radiographs are performed [83]. Stress radiographs confirm instability by obtaining a lateral view during the anterior drawer test and a mortise view during the talar tilt test [83]. Stress inversion ankle roentgenograms should be considered in cases of talar osteochondritis dissecans [143].

MRI: MRI can show osteophytes but is not very sensitive for soft-tissue impingement of the ankle [33]. MR arthrography or contrast-enhanced, fat-suppressed, three-dimensional (3D), fast-gradient recalled acquisition in the steady state with radiofrequency spoiling (CE 3D-FSPGR) MRI is more sensitive and specific for soft-tissue impingement but is less practical [33]. In one study, 58% of patients with anterior ankle impingement had an associated diagnosis, which changed the surgical plan in 33% [33]. MRI is useful for evaluating associated pathology to the peroneal tendons or talar articular surface in lateral ankle instability [83]. It confirms the abnormal appearance of affected ligaments, which may be thickened or indistinct, but does not determine functional instability [83]. MRI has excellent interobserver reliability (intraclass correlation coefficient, 0.915) for detecting anterior talofibular ligament injuries in patients with a clinical suspicion of chronic lateral ankle instability [137]. Two distinct anterior talofibular ligament fascicles may be identified in the majority of ankles on MRI [44]. Clinical implementation of optimal high-field MRI sequences in a standard clinical ankle MRI exam can aid in the diagnosis of syndesmotic injuries, augment pre-operative planning, and facilitate anatomic repair [128]. CT and MRI are excellent imaging modalities that can help the timely diagnosis and appropriate treatment for combined anterior and posterior ankle impingement with circumferential lesions [101].

Arthroscopy: Preoperative ankle arthroscopy reveals essential information that would otherwise have been undetected, showing that abnormalities of different structures are involved in chronic ankle instability with no single causal entity [28]. A simple arthroscopic evaluation consistently visualized anterior talofibular ligament lesions, thereby either correcting or confirming the pre-operative imaging study findings [135]. The endoscopic approach allows assessment of the ankle joint and treatment of associated intra-articular lesions in the context of chronic lateral ankle instability [40]. The posterior arthroscopic technique allows for the identification of various pathologies beyond the common Posterior Ankle Impingement Syndrome [6]. Bony impingement was the major pathological process in more than 90 percent of ballet dancers with posterior ankle impingement syndrome, though special attention should be paid to some other conditions that concomitantly existed [20].

Treatment

Non-Operative

Nonsurgical management for posterior ankle impingement achieves success in 60% of patients [37], with 85% of those receiving an injection reporting pain relief [37]. In pediatric athletes, the success of physical therapy is not dependent on age, sex, sport, or pathology [19]. Surgical intervention for posterior ankle impingement is indicated only after 3 to 6 months of unsuccessful nonsurgical treatment [37]. For anterior ankle impingement, arthroscopic debridement is considered when symptoms persist despite activity modification, immobilization, and rehabilitation [33]. Similarly, surgical treatment for chronic lateral ankle instability should be considered only after failure of non-surgical treatment [122], and patients undergoing arthroscopic treatment must have failed nonoperative measures including physical therapy, bracing, and immobilization [123].

Operative

Indications: Arthroscopic treatment for anterior ankle impingement is supported by a grade B recommendation (fair evidence) [33]. Patients with a poorer prognosis for this procedure include those without a clear diagnosis and those with higher grades of arthritic changes of the ankle [33]. A body mass index of greater than 26 and male sex are associated with worse outcomes after anterior arthroscopic ankle debridement [59].

Surgical Approach / Technique: Arthroscopic debridement for anterior ankle impingement provides good outcomes with respect to patient satisfaction and low complication rates [5]. Reported success rates range from 73% to 96% in level II to IV studies [33], and patient satisfaction was good or excellent in 74% to 100% of cases in a 2015 systematic review [33]. The complication rate for anterior ankle impingement arthroscopy was 5.1% in that same review [33]. Level IV studies confirm that ankle arthroscopy is successful for anteromedial impingement, anterolateral impingement, and anterior bony impingement [33]. Simple arthroscopic surgical techniques can improve both pain and joint mobility in cases of bony ankle impingement associated with poorly tolerated range of motion restriction [4]. In-office needle arthroscopy (IONA) treatment of anterior ankle impingement results in significant pain reduction, a low complication rate, and excellent patient-reported outcomes [15], yielding high rates of return to work and sport [15]. The addition of electrothermal denervation (ETD) to arthroscopic debridement for anterior ankle impingement did not show significant superiority in VASFA, FFI, or AOFAS scores at 24 hours and 6 weeks post-surgery [129].

For posterior ankle impingement, arthroscopic treatment is minimally invasive and suitable for athletes who desire an early return to previous sports activity [10]. Arthroscopic excision and decompression of the posterior ankle is as successful as open surgery [37]. Long-term outcome of endoscopic treatment for posterior ankle impingement demonstrated good results, with high patient satisfaction, good functional outcome scores, and a low rate of recurrence [12]. All 16 patients who underwent posterior ankle arthroscopy had good to excellent health-related quality of life and functional outcome scores at a mean 32-month follow-up [37], and 93% had returned to their preinjury athletic level [37]. High-level athletes had an average return to the preinjury level 46.9 days after arthroscopic decompression surgery for posterior ankle impingement [37]. Posterior ankle endoscopy in the supine position is a safe and effective approach, particularly when concomitant anterior ankle pathology requires anterior arthroscopy [26]. The posterior approach allows for the identification of various pathologies beyond the common Posterior Ankle Impingement Syndrome [6]. In pediatric athletes, arthroscopic treatment after failed conservative management allowed patients to return to prior level of activity and sports [139], resulting in improved pain relief and higher functional parameters with minimal complications [139]. A patient with bilateral os trigonum fracture treated with simultaneous posterior ankle arthroscopy experienced a return to the same level of sports activities and reported no pain on either ankle [30].

Other Considerations: In 42 patients with anterior impingement, the AOFAS score improved from 40.6 preoperatively to 82.6 at 2 years, 78.4 at 4 years, and 74.8 at 6 years postoperatively [59]. Functional outcome scores considerably improved in patients with anterior impingement without ankle osteoarthritis, even though there was recurrence of radiographic osteophytes [59]. Osteophytes may recur after anterior ankle impingement surgery but usually are not symptomatic [33]. Arthroscopic decompression is a safe and effective technique for treating medial ankle impingement after total ankle arthroplasty [64], offering advantages such as earlier weightbearing, faster recovery, and less risk of periprosthetic infection compared to open procedures [64]. Arthroscopic treatment of ankle instability is emerging as the potential gold standard technique, offering the advantage of addressing both instability and associated intra-articular pathology in a single procedure [69]. However, the presence of an osteochondral lesion had a negative effect on the overall result when compared to that of patients who underwent lateral ankle stabilization as an isolated procedure [66]. Ankle stability resumed with a high clinical success rate following a new arthroscopic Broström procedure for chronic lateral ankle instability [54]. Ultrasound-guided ATFL repair with or without augmentation for chronic lateral ankle instability is safe and results in clinical improvement at 6 months [127].

Complications

Overall Complication Rates: Arthroscopic treatment for anterior ankle impingement is associated with a low complication rate [5]. In a systematic review of 20 articles, the overall complication rate for anterior ankle impingement treatment was 4.6% [59]. In the same systematic review, the major complication rate for anterior ankle impingement treatment was 1.1% [59]. In-office needle arthroscopy for anterior ankle impingement also results in a low complication rate [15].

Posterior Ankle Impingement: In a systematic review of surgical treatment for posterior ankle impingement, the complication rate for endoscopic procedures was 7.3% [38]. The major complication rate for endoscopic procedures was 5.4% [38]. In contrast, the complication rate for open procedures was 15.9% [38], with a major complication rate of 13.8% [38].

Other Considerations: Plication of the anterolateral capsule with extensor digitorum brevis transfer for chronic lateral ligament instability resulted in no serious complications [67]. Radiographic osteophyte recurrence was observed in patients treated for anterior impingement without ankle osteoarthritis [59].

Recovery

Operative

Light activity (weeks): Patients undergoing augmented modified Broström reconstruction with immediate weightbearing achieve excellent functional outcomes by 6 weeks [134]. This early milestone is associated with minimal complications and high patient satisfaction [134].

Full activity (months): Return to sport occurs before 1 year in patients treated with augmented modified Broström reconstruction [134]. High return-to-sport and return-to-work rates are observed after anatomic lateral ankle ligament reconstruction with tendon autograft for isolated chronic lateral ankle instability [149].

Complete recovery / outcome plateau (months): Long-term stability is maintained in salvage reconstruction cases; fourteen years post-procedure, a patient treated with tendon allograft for lateral ankle instability maintained a stable, painless ankle with no additional instability [23]. One year after the procedure, roentgenograms demonstrated stable ankles with a full range of motion [29].

Rehabilitation protocol: The success of lateral ankle instability surgery depends on proper phases of the rehabilitation period [153].

Functional milestones: In-office needle arthroscopy treatment of anterior ankle impingement results in significant pain reduction, a low complication rate, and excellent patient-reported outcomes with high rates of return to work and sport [15]. Combined treatment of chronic ankle instability and anterior ankle impingement produced satisfactory surgical outcomes in patients with chronic ankle instability accompanied by anterior ankle impingement symptom [3].

Key Evidence

  • [L4] Ankle impingement is an increasingly recognized cause of symptoms in an athletic population as our understanding of the etiology, pathogenesis, and presentation continues to evolve. [1] (10.1186/s13018-016-0430-x)
  • [L5] Further study is needed to confirm current understanding of anterior ankle impingement and to better define treatment options and prevention strategies. [2] (10.5435/jaaos-22-05-333)
  • [L3] Combined treatment of chronic ankle instability and anterior ankle impingement produced satisfactory surgical outcomes in patients with CAI accompanied by anterior ankle impingement symptom. [3] (10.1186/s12891-018-2168-6)
  • [L4] In cases of bony ankle impingement associated with poorly tolerated range of motion restriction, simple arthroscopic surgical techniques can improve both pain and joint mobility. [4] (10.1016/j.otsr.2010.01.008)
  • [L4] Arthroscopic treatment for anterior ankle impingement appears to provide good outcomes with respect to patient satisfaction and low complication rates. [5] (10.1016/j.arthro.2015.01.023)
  • [L4] The technique allows for the identification of various pathologies beyond the common Posterior Ankle Impingement Syndrome. [6] (10.1016/j.arthro.2020.12.135)
  • [L2] In cases of symptomatic posterior ankle impingement, we advise that a PIM view be used instead of or in addition to the standard lateral view for detection of posterior talar pathologic conditions. [7] (10.1016/j.arthro.2014.05.006)
  • [L5] [8] (10.1177/0095399703258697)
  • [L5] Arthroscopic debridement is considered the gold standard to treat anterior ankle impingement. [9] (10.1136/jisakos-2019-000282)
  • [L4] Arthroscopic treatment for posterior ankle bony impingement syndrome is minimally invasive and especially suitable for athletes who desire an early return to previous sports activity. [10] (10.1016/j.arthro.2012.04.115)
  • [L4] Complex ankle bony impingement combined with lateral instability can yield good clinical results when treated surgically with both ankle stabilization and osteophyte removal. [11] (10.1177/23259671241270309)
  • [L4] Long-term outcome of endoscopic treatment for posterior ankle impingement demonstrated good results, with high patient satisfaction, good functional outcome scores and a low rate of recurrence for all types of posterior ankle impingement. [12] (10.1136/jisakos-2017-000175)
  • [L4] Ankle arthroscopy was performed more frequently in female patients and most commonly in patients younger than 50 years, with a significant increase in its use for lateral ankle instability management. [13] (10.1016/j.arthro.2015.01.020)
  • [L4] MCL insufficiency resulted from medial ankle instability and medial impingement lesions. [14] (10.1177/0363546517700859)
  • [L4] IONA treatment of anterior ankle impingement results in significant pain reduction, a low complication rate, and excellent patient-reported outcomes with high rates of return to work/sport. [15] (10.1016/j.arthro.2021.09.016)
  • [L5] The clinical examination remains the key stage in the management of disorders of the foot and the ankle, avoiding the sequence 'symptom → IRM → surgical indication' and enabling the construction of a simple and logical pathogenic causal sequence to develop an appropriate treatment plan. [16] (10.1016/j.otsr.2009.03.008)
  • [L4] Antero-lateral ankle impingement syndrome is closely linked to anterior talo-fibular ligament injury and, in some patients, to chronic ankle instability. [17] (10.1016/j.otsr.2017.09.004)
  • [L4] The study demonstrates that while PT success is not dependent on age, sex, sport, or pathology, a notable proportion of pediatric patients with posterior ankle impingement avoid surgery through conservative management. [19] (10.1177/2325967121s00082)
  • [L4] Bony impingement was the major pathological process, related in more than 90 percent of the patients; special attention, however, should be paid to some other conditions that concomitantly existed. [20] (10.1016/j.arthro.2011.03.060)
  • [L5] [21] (10.1007/s00167-006-0275-7)
  • [L5] Operative procedures that only focus on part of the pathology should be approached with caution until assessment of a patient with ankle instability defines all deficiencies. [22] (10.2106/jbjs.21.00726)
  • [L4] Fourteen years post-procedure, the patient maintained a stable, painless ankle with no additional instability. [23] (10.1097/01.blo.0000092976.12414.b0)
  • [Paper] Posterior ankle endoscopy in the supine position is a safe and effective approach for treatment of posterior ankle impingement, particularly when concomitant anterior ankle pathology requires anterior arthroscopy, allowing treatment of both pathologies without changing patient position. [26] (10.1016/j.eats.2016.07.006)
  • [Case_report] Ankle distortion can result in the formation of intraarticular fibrous bands causing 'web impingement' of the ankle. [27] (10.1007/s00167-012-2077-4)
  • [L4] Preoperative ankle arthroscopy revealed an essential amount of information that would otherwise have been undetected, showing that abnormalities of different structures are involved in chronic ankle instability with no single causal entity. [28] (10.1177/03635465020300031601)
  • [L5] She experienced a return to the same level of sports activities and reported no pain on either ankle. [30] (10.5435/jaaosglobal-d-23-00237)
  • [L5] Posterior ankle impingement syndrome results from recurrent trauma to the posterior ankle capsuloligamentous complex, flexor hallucis longus tendon, and/or os trigonum. [31] (10.1016/j.csm.2020.06.001)
  • [L4] Hindfoot arthroscopic surgery is a safe and effective treatment strategy for posterior ankle impingement syndrome. [35] (10.1177/0363546513489489)
  • [L3] Manual stress testing is a valuable method for identifying mechanical ankle instability but may overvalue patient-reported instability due to its subjective character. 3D stress MRI and stress sonography represent valuable alternatives for quantitatively assessing mechanical ankle instability in research and practice. [36] (10.1186/s12891-021-03998-z)
  • [L4] [38] (10.1016/j.arthro.2013.01.029)
  • [L2] The endoscopic approach also allows assessment of the ankle joint and treatment of associated intra-articular lesions. [40] (10.1007/s00167-019-05793-9)
  • [L5] The data on impact location and impact force support the hypothesis that anterior ankle impingement syndrome is related to direct damage to the ankle cartilage rim, with subsequent reactive spur formation. [43] (10.1177/03635465020300012101)
  • [L3] Two distinct ATFL fascicles may be identified in the majority of ankles on MRI. [44] (10.1007/s00167-022-07275-x)
  • [L4] The literature would benefit greatly from the standardization of the definition of ankle instability treatment failure. [45] (10.1177/03635465231153165)
  • [L4] [46] (10.1007/s00167-012-2155-7)
  • [L3] [52] (10.1002/ksa.12079)
  • [L2] [53] (10.1177/0363546516682498)
  • [L4] Ankle stability resumed with a high clinical success rate. [54] (10.1186/s13018-023-03789-3)
  • [L3] Arthroscopic ankle stabilisation repair and reconstruction techniques hold considerable promise but require further evaluation to better determine the indications of repair versus reconstruction and to obtain information on long-term outcomes. [62] (10.1016/j.otsr.2018.09.005)
  • [Paper] Arthroscopic decompression is a safe and effective technique for treating medial ankle impingement after total ankle arthroplasty, offering advantages such as earlier weightbearing, faster recovery, and less risk of periprosthetic infection compared to open procedures. [64] (10.1016/j.eats.2021.02.001)
  • [L4] The presence of an osteochondral lesion had a negative effect on the overall result when compared to that of patients who underwent lateral ankle stabilization as an isolated procedure. [66] (10.1177/0363546509351556)
  • [L4] Although excessive talar tilt persisted radiologically in some cases, functional instability did not recur and no serious complications were encountered. [67] (10.1016/0020-1383(88)90073-3)
  • [L5] Arthroscopic treatment of ankle instability is emerging as the potential gold standard technique, offering the advantage of addressing both instability and associated intra-articular pathology in a single procedure with excellent results. [69] (10.1016/j.arthro.2020.10.043)
  • [Case_report] We suggest CT and MRI as excellent imaging modalities that can help the timely diagnosis and appropriate treatment for this combined impingement with circumferential lesions. [101] (10.1186/s12891-020-03584-9)
  • [L4] This arthroscopic classification of chronic ATFL lesions confirms the diagnostic role for arthroscopy in assessing the ligaments in patients with CAI and is helpful for determining the best surgical technique for stabilising the ankle. [104] (10.1016/j.otsr.2018.09.004)
  • [L5] The anterior tibiofibular ligament has a constant distal fascicle that is in contact with the anterolateral part of the talus in the neutral position and in plantar flexion. [105] (10.1007/s00167-018-5123-z)
  • [L5] This international consensus derived from leaders in the field will assist clinicians with the appropriate terminology for osteochondral lesions of the ankle. [117] (10.1016/j.jisako.2021.12.001)
  • [L4] PAIS is observed in athletes in many sports, is caused mainly by bony impingement, and is often associated with FHL-related pathology. [120] (10.1177/23259671261422259)
  • [L5] [122] (10.1007/s00167-017-4556-0)
  • [L3] [123] (10.1177/03635465211008097)
  • [L4] Ultrasound-guided ATFL repair with or without augmentation for chronic lateral ankle instability is safe and results in clinical improvement at 6 months. [127] (10.1016/j.jisako.2025.100386)
  • [L2] Clinical implementation of optimal high-field MRI sequences in a standard clinical ankle MRI exam can aid in the diagnosis of syndesmotic injuries, augment pre-operative planning, and facilitate anatomic repair. [128] (10.1007/s00167-014-3399-1)
  • [L1] The addition of ETD as part of the arthroscopic debridement of the anterior ankle impingement did not show any significant superiority in terms of the collected scores (VASFA, FFI, and AOFAS) at 24 hours and 6 weeks after the surgery. [129] (10.1016/j.asmr.2021.11.019)
  • [L5] [130] (10.1530/eor-22-0024)
  • [L4] Most patients achieved excellent functional outcomes by 6 weeks, with minimal complications, high satisfaction, and return to sport before 1 year. [134] (10.1177/23259671251389196)
  • [L2] A simple arthroscopic evaluation consistently visualized ATFL lesions, thereby either correcting or confirming the pre-operative imaging study findings. [135] (10.1016/j.otsr.2018.09.008)
  • [L3] This study showed that MRI has excellent interobserver reliability (intraclass correlation coefficient, 0.915) for detecting ATFL injuries in patients in whom there is a clinical suspicion of chronic lateral ankle instability. [137] (10.1016/j.arthro.2015.02.024)
  • [L3] Arthroscopic treatment after failed conservative management allowed patients to return to prior level of activity and sports, and resulted in improved pain relief and higher functional parameters with minimal complications. [139] (10.1177/2325967121s00030)
  • [L4] The case demonstrates that repeated inversion stress in ankles with lax lateral ligaments can result in osteochondral lesions of the medial part of the talus, and stress inversion ankle roentgenograms should be considered in cases of talar osteochondritis dissecans. [143] (10.2106/00004623-197052010-00018)
  • [L4] [144] (10.1177/03635465221084365)
  • [L4] These results may be helpful in preoperatively managing patients' expectations regarding sports- and work-related outcomes and provide tangible data on the expectable time frame of the individual return to sports and work trajectory. [149] (10.1007/s00167-022-06937-0)
  • [L5] The success of lateral ankle instability surgery also depends on proper phases of the rehabilitation period. [153] (10.1177/2325967124s00376)

See Also

References

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[2] Anterior Ankle Impingement. Journal of the American Academy of Orthopaedic Surgeons. 2014. DOI: 10.5435/jaaos-22-05-333

[3] Arthroscopic debridement of anterior ankle impingement in patients with chronic lateral ankle instability. BMC Musculoskeletal Disorders. 2018. DOI: 10.1186/s12891-018-2168-6

[4] Anterior ankle bony impingement with joint motion loss: The arthroscopic resection option. Orthopaedics & Traumatology: Surgery & Research. 2010. DOI: 10.1016/j.otsr.2010.01.008

[5] Arthroscopic Treatment for Anterior Ankle Impingement: A Systematic Review of the Current Literature. Arthroscopy. 2015. DOI: 10.1016/j.arthro.2015.01.023

[6] Our Experience in Arthroscopic Treatment of Posterior Ankle Impingement by Posterior Approach. Arthroscopy: The Journal of Arthroscopic & Related Surgery. 2021. DOI: 10.1016/j.arthro.2020.12.135

[7] The Posterior Impingement View: An Alternative Conventional Projection to Detect Bony Posterior Ankle Impingement. Arthroscopy. 2014. DOI: 10.1016/j.arthro.2014.05.006

[8] The Accessory Anteroinferior Tibiofibular Ligament as a Cause of Talar Impingement. The American Journal of Sports Medicine. 2004. DOI: 10.1177/0095399703258697

[9] Diagnosis and treatment of anterior ankle impingement: state of the art. Journal of ISAKOS. 2020. DOI: 10.1136/jisakos-2019-000282

[10] The Advantage of Arthroscopic Excision of Posterior Ankle Impingement Syndrome (SS‐57). Arthroscopy. 2012. DOI: 10.1016/j.arthro.2012.04.115

[11] Surgical Management of Complex Ankle Bony Impingement Combined With Chronic Ankle Instability. Orthopaedic Journal of Sports Medicine. 2024. DOI: 10.1177/23259671241270309

[12] Endoscopic treatment for posterior ankle impingement: high patient satisfaction and low recurrence rate at long-term follow-up. Journal of ISAKOS. 2018. DOI: 10.1136/jisakos-2017-000175

[13] Trends in Ankle Arthroscopy and Its Use in the Management of Pathologic Conditions of the Lateral Ankle in the United States: A National Database Study. Arthroscopy. 2015. DOI: 10.1016/j.arthro.2015.01.020

[14] Simultaneous Reconstruction of the Medial and Lateral Collateral Ligaments for Chronic Combined Ligament Injuries of the Ankle. The American Journal of Sports Medicine. 2017. DOI: 10.1177/0363546517700859

[15] In‐Office Needle Arthroscopy for the Treatment of Anterior Ankle Impingement Yields High Patient Satisfaction With High Rates of Return to Work and Sport. Arthroscopy. 2021. DOI: 10.1016/j.arthro.2021.09.016

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[20] Hindfoot Endoscopic Findings of Posterior Ankle Impingement Syndrome in Ballet Dancers (SS‐56). Arthroscopy. 2011. DOI: 10.1016/j.arthro.2011.03.060

[21] The distal fascicle of the anterior inferior tibiofibular ligament as a cause of tibiotalar impingement syndrome: a current concepts review. Knee Surgery, Sports Traumatology, Arthroscopy. 2007. DOI: 10.1007/s00167-006-0275-7

[22] Ankle Stability. Journal of Bone and Joint Surgery. 2021. DOI: 10.2106/jbjs.21.00726

[23] Salvage Reconstruction for Lateral Ankle Instability Using a Tendon Allograft. Clinical Orthopaedics and Related Research. 2003. DOI: 10.1097/01.blo.0000092976.12414.b0

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[26] Decompression of Posterior Ankle Impingement With Concomitant Anterior Ankle Pathology by Posterior Ankle Arthroscopy in the Supine Position. Arthroscopy Techniques. 2016. DOI: 10.1016/j.eats.2016.07.006

[27] “Web impingement” of the ankle: a case report. Knee Surgery, Sports Traumatology, Arthroscopy. 2012. DOI: 10.1007/s00167-012-2077-4

[28] Arthroscopic Findings in Patients with Chronic Ankle Instability. The American Journal of Sports Medicine. 2002. DOI: 10.1177/03635465020300031601

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[30] Bilateral Os Trigonum Fracture Treated With Simultaneous Posterior Ankle Arthroscopy. JAAOS: Global Research and Reviews. 2024. DOI: 10.5435/jaaosglobal-d-23-00237

[31] Posterior Ankle Impingement and Flexor Hallucis Longus Pathology. Clinics in Sports Medicine. 2020. DOI: 10.1016/j.csm.2020.06.001

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[35] Hindfoot Arthroscopic Surgery for Posterior Ankle Impingement. The American Journal of Sports Medicine. 2013. DOI: 10.1177/0363546513489489

[36] Clinical evaluation of manual stress testing, stress ultrasound and 3D stress MRI in chronic mechanical ankle instability. BMC Musculoskeletal Disorders. 2021. DOI: 10.1186/s12891-021-03998-z

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[38] Surgical Treatment for Posterior Ankle Impingement. Arthroscopy. 2013. DOI: 10.1016/j.arthro.2013.01.029

[40] Endoscopic anatomic ligament reconstruction is a reliable option to treat chronic lateral ankle instability. Knee Surgery, Sports Traumatology, Arthroscopy. 2019. DOI: 10.1007/s00167-019-05793-9

[41] Miller S Review Of Orthopaedics. ANKLE SPRAINS.

[43] The Relationship of the Kicking Action in Soccer and Anterior Ankle Impingement Syndrome. The American Journal of Sports Medicine. 2002. DOI: 10.1177/03635465020300012101

[44] Individual fascicles of the ankle lateral ligaments and the lateral fibulotalocalcaneal ligament complex can be identified on 3D volumetric MRI. Knee Surgery, Sports Traumatology, Arthroscopy. 2022. DOI: 10.1007/s00167-022-07275-x

[45] Current Definitions of Failure in Lateral Ankle Instability Surgery: A Systematic Review. The American Journal of Sports Medicine. 2023. DOI: 10.1177/03635465231153165

[46] Post‐traumatic anterior impingement of the ankle. Knee Surgery, Sports Traumatology, Arthroscopy. 2012. DOI: 10.1007/s00167-012-2155-7

[52] Acute clinical evaluation for the diagnosis of lateral ankle ligament injuries is useful: A comparison between the acute and delayed settings. Knee Surgery, Sports Traumatology, Arthroscopy. 2024. DOI: 10.1002/ksa.12079

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[54] Mid-term follow-up evaluation of a new arthroscopic Broström procedure for chronic lateral ankle instability. Journal of Orthopaedic Surgery and Research. 2023. DOI: 10.1186/s13018-023-03789-3

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[120] Postoperative Results of Posterior Ankle Impingement Syndrome in Athletes and Its Clinical Features. Orthopaedic Journal of Sports Medicine. 2026. DOI: 10.1177/23259671261422259

[122] Searching for consensus in the approach to patients with chronic lateral ankle instability: ask the expert. Knee Surgery, Sports Traumatology, Arthroscopy. 2017. DOI: 10.1007/s00167-017-4556-0

[123] Additional Inferior Extensor Retinaculum Augmentation After All-Inside Arthroscopic Anterior Talofibular Ligament Repair for Chronic Ankle Instability Is Not Necessary. The American Journal of Sports Medicine. 2021. DOI: 10.1177/03635465211008097

[127] Ultrasound-guided repair of the anterior talofibular ligament with or without Gould augmentation is safe and improves clinical outcomes for chronic lateral ankle instability: A case series of 49 patients. Journal of ISAKOS. 2025. DOI: 10.1016/j.jisako.2025.100386

[128] Magnetic resonance imaging characterization of individual ankle syndesmosis structures in asymptomatic and surgically treated cohorts. Knee Surgery, Sports Traumatology, Arthroscopy. 2014. DOI: 10.1007/s00167-014-3399-1

[129] Electrothermal Denervation of Synovial and Capsular Tissue Does not Improve Postoperative Pain in Arthroscopic Debridement of Anterior Ankle Impingement—A Prospective Randomized Study. Arthroscopy, Sports Medicine, and Rehabilitation. 2022. DOI: 10.1016/j.asmr.2021.11.019

[130] Osteochondral lesion of the talus: still a problem?. EFORT Open Reviews. 2022. DOI: 10.1530/eor-22-0024

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[135] Agreement between arthroscopic and imaging study findings in chronic anterior talo-fibular ligament injuries. Orthopaedics & Traumatology: Surgery & Research. 2018. DOI: 10.1016/j.otsr.2018.09.008

[137] Reliability and Validity of Magnetic Resonance Imaging for the Evaluation of the Anterior Talofibular Ligament in Patients Undergoing Ankle Arthroscopy. Arthroscopy. 2015. DOI: 10.1016/j.arthro.2015.02.024

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[143] Bilateral Talar Osteochondritis Dissecans with Lax Ankle Ligaments. The Journal of Bone & Joint Surgery. 1970. DOI: 10.2106/00004623-197052010-00018

[144] One in Three Patients With Chronic Lateral Ankle Instability Has a Cartilage Lesion. The American Journal of Sports Medicine. 2022. DOI: 10.1177/03635465221084365

[149] High return to sports and return to work rates after anatomic lateral ankle ligament reconstruction with tendon autograft for isolated chronic lateral ankle instability. Knee Surgery, Sports Traumatology, Arthroscopy. 2022. DOI: 10.1007/s00167-022-06937-0

[153] Arthroscopic ankle lateral ligament instabilities repair. Orthopaedic Journal of Sports Medicine. 2024. DOI: 10.1177/2325967124s00376

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c. indicate the Licensed Material is licensed under this Public License, and include the text of, or the URI or hyperlink to, this Public License.

2. You may satisfy the conditions in Section 3(a)(1) in any reasonable manner based on the medium, means, and context in which You Share the Licensed Material. For example, it may be reasonable to satisfy the conditions by providing a URI or hyperlink to a resource that includes the required information.

3. If requested by the Licensor, You must remove any of the information required by Section 3(a)(1)(A) to the extent reasonably practicable.

4. If You Share Adapted Material You produce, the Adapter's License You apply must not prevent recipients of the Adapted Material from complying with this Public License.

Section 4 -- Sui Generis Database Rights.

Where the Licensed Rights include Sui Generis Database Rights that apply to Your use of the Licensed Material:

a. for the avoidance of doubt, Section 2(a)(1) grants You the right to extract, reuse, reproduce, and Share all or a substantial portion of the contents of the database for NonCommercial purposes only;

b. if You include all or a substantial portion of the database contents in a database in which You have Sui Generis Database Rights, then the database in which You have Sui Generis Database Rights (but not its individual contents) is Adapted Material; and

c. You must comply with the conditions in Section 3(a) if You Share all or a substantial portion of the contents of the database.

For the avoidance of doubt, this Section 4 supplements and does not replace Your obligations under this Public License where the Licensed Rights include other Copyright and Similar Rights.

Section 5 -- Disclaimer of Warranties and Limitation of Liability.

a. UNLESS OTHERWISE SEPARATELY UNDERTAKEN BY THE LICENSOR, TO THE EXTENT POSSIBLE, THE LICENSOR OFFERS THE LICENSED MATERIAL AS-IS AND AS-AVAILABLE, AND MAKES NO REPRESENTATIONS OR WARRANTIES OF ANY KIND CONCERNING THE LICENSED MATERIAL, WHETHER EXPRESS, IMPLIED, STATUTORY, OR OTHER. THIS INCLUDES, WITHOUT LIMITATION, WARRANTIES OF TITLE, MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, NON-INFRINGEMENT, ABSENCE OF LATENT OR OTHER DEFECTS, ACCURACY, OR THE PRESENCE OR ABSENCE OF ERRORS, WHETHER OR NOT KNOWN OR DISCOVERABLE. WHERE DISCLAIMERS OF WARRANTIES ARE NOT ALLOWED IN FULL OR IN PART, THIS DISCLAIMER MAY NOT APPLY TO YOU.

b. TO THE EXTENT POSSIBLE, IN NO EVENT WILL THE LICENSOR BE LIABLE TO YOU ON ANY LEGAL THEORY (INCLUDING, WITHOUT LIMITATION, NEGLIGENCE) OR OTHERWISE FOR ANY DIRECT, SPECIAL, INDIRECT, INCIDENTAL, CONSEQUENTIAL, PUNITIVE, EXEMPLARY, OR OTHER LOSSES, COSTS, EXPENSES, OR DAMAGES ARISING OUT OF THIS PUBLIC LICENSE OR USE OF THE LICENSED MATERIAL, EVEN IF THE LICENSOR HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH LOSSES, COSTS, EXPENSES, OR DAMAGES. WHERE A LIMITATION OF LIABILITY IS NOT ALLOWED IN FULL OR IN PART, THIS LIMITATION MAY NOT APPLY TO YOU.

c. The disclaimer of warranties and limitation of liability provided above shall be interpreted in a manner that, to the extent possible, most closely approximates an absolute disclaimer and waiver of all liability.

Section 6 -- Term and Termination.

a. This Public License applies for the term of the Copyright and Similar Rights licensed here. However, if You fail to comply with this Public License, then Your rights under this Public License terminate automatically.

b. Where Your right to use the Licensed Material has terminated under Section 6(a), it reinstates:

1. automatically as of the date the violation is cured, provided it is cured within 30 days of Your discovery of the violation; or

2. upon express reinstatement by the Licensor.

For the avoidance of doubt, this Section 6(b) does not affect any right the Licensor may have to seek remedies for Your violations of this Public License.

c. For the avoidance of doubt, the Licensor may also offer the Licensed Material under separate terms or conditions or stop distributing the Licensed Material at any time; however, doing so will not terminate this Public License.

d. Sections 1, 5, 6, 7, and 8 survive termination of this Public License.

Section 7 -- Other Terms and Conditions.

a. The Licensor shall not be bound by any additional or different terms or conditions communicated by You unless expressly agreed.

b. Any arrangements, understandings, or agreements regarding the Licensed Material not stated herein are separate from and independent of the terms and conditions of this Public License.

Section 8 -- Interpretation.

a. For the avoidance of doubt, this Public License does not, and shall not be interpreted to, reduce, limit, restrict, or impose conditions on any use of the Licensed Material that could lawfully be made without permission under this Public License.

b. To the extent possible, if any provision of this Public License is deemed unenforceable, it shall be automatically reformed to the minimum extent necessary to make it enforceable. If the provision cannot be reformed, it shall be severed from this Public License without affecting the enforceability of the remaining terms and conditions.

c. No term or condition of this Public License will be waived and no failure to comply consented to unless expressly agreed to by the Licensor.

d. Nothing in this Public License constitutes or may be interpreted as a limitation upon, or waiver of, any privileges and immunities that apply to the Licensor or You, including from the legal processes of any jurisdiction or authority.

Creative Commons is not a party to its public licenses. Notwithstanding, Creative Commons may elect to apply one of its public licenses to material it publishes and in those instances will be considered the “Licensor.” The text of the Creative Commons public licenses is dedicated to the public domain under the CC0 Public Domain Dedication. Except for the limited purpose of indicating that material is shared under a Creative Commons public license or as otherwise permitted by the Creative Commons policies published at creativecommons.org/policies, Creative Commons does not authorize the use of the trademark "Creative Commons" or any other trademark or logo of Creative Commons without its prior written consent including, without limitation, in connection with any unauthorized modifications to any of its public licenses or any other arrangements, understandings, or agreements concerning use of licensed material. For the avoidance of doubt, this paragraph does not form part of the public licenses.

Creative Commons may be contacted at creativecommons.org.