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Septic arthritis of the knee

82 citationsUpdated Sep 2026

Overview

Septic arthritis of the adult knee is a surgical urgency most commonly caused by S aureus, with increasing rates of MRSA [5]. Intravenous drug use is an increasingly common cause of septic knee admissions and is associated with higher rates of mortality, reoperations, resource utilization, and leaving against medical advice [48]. Persistence or recurrence of clinical signs of infection after management should raise suspicion of adjacent osteomyelitis, especially in patients with comorbid conditions [1]. Postoperative septic arthritis is rare after arthroscopically guided ACL reconstruction but carries high morbidity, resulting in protracted hospitalization and less favorable clinical outcomes [2, 6]. Although septic arthritis after ACL reconstruction did not result in inferior objective knee function compared with uncomplicated reconstruction [3], surgery is recommended as the primary treatment because conservative methods often result in longer recovery periods and less favorable outcomes [13].

Arthroscopic treatment for acute native knee septic arthritis is a more successful index procedure compared with open treatment, requiring fewer total irrigation procedures [16]. Arthroscopy results in a lower reoperation rate than arthrotomy [23], with no difference in relative risk of perioperative complications, length of stay, or hospital cost compared with open arthrotomy [32]. No significant long-term functional differences were observed among arthroscopy combined with continuous irrigation, arthroscopic debridement alone, and open arthrotomy for the treatment of septic arthritis of the native knee [4]. Arthroscopic debridement combined with antibiotic treatment can lead to successful eradication of infection and graft salvage in cases of septic arthritis following ACL reconstruction, yielding satisfactory functional outcomes in many cases [31].

Patients with a history of treated septic arthritis are at high risk of developing periprosthetic joint infection after total joint arthroplasty, with the risk being greater in knee arthroplasty compared to hip arthroplasty [7]. In the knee, cases of unsuspected prosthetic joint infection had inferior infection-free survival at two years compared with those with negative cultures [9]. Single-stage TKA is a suitable option for patients with a prior septic arthritis of the knee, provided that proper surgical technique and the utilization of systemic and local antibiotics are employed [15]. There is conflicting evidence regarding the benefit of extended (>24 hours) antibiotics, IV or PO, after total joint arthroplasty [36]. Continued investigation is required to determine the fate of infected joints that undergo DAIR with regard to ultimate patient outcome [39].

Anatomy & Pathophysiology

Osseous Anatomy

The knee joint comprises the distal femur, proximal tibia, and patella [42]. The medial femoral condyle is larger and projects farther posteriorly and distally than the lateral condyle [65]. The medial epicondyle represents the most anterior and distal osseous prominence of the distal femur, with the adductor tubercle located proximal and posterior to it [65]. The gastrocnemius tubercle lies slightly distal and posterior to the adductor tubercle [65]. Conversely, the lateral femoral condyle projects farther anteriorly and is wider in the medial-lateral direction than the medial condyle [65, 70]. This broader anterior-posterior and medial-lateral dimension of the lateral condyle allows for internal rotation of the distal femur during knee extension [70]. The sulcus terminalis, a small ridge on the lateral femoral condyle just distal to the intercondylar notch, separates the patellofemoral and tibiofemoral articular surfaces [65]. This transverse ridge extends from the oblique facets of the femoral trochlea and is deeper on the lateral condyle than on the medial condyle [70]. The trochlear groove separates the femoral condyles anteriorly, constituting the patellofemoral articulation, while the lateral trochlear facet resists lateral subluxation of the patella [65, 70]. The intercondylar notch, of variable width, serves as the attachment site for the cruciate ligaments [65].

The tibial articular surface slopes 7° to 10° in the sagittal plane [65]. The medial tibial plateau is larger than the lateral plateau and is concave in both frontal and sagittal planes [65]. The lateral tibial plateau is smaller, more circular, concave in the frontal plane, and convex in the sagittal plane [65]. These plateaus are separated by the intercondylar eminence and its medial and lateral spinous processes [65]. The posterior slope of the tibia averages 10.7° in the medial plateau and 7.2° in the lateral plateau [70]. The medial compartment features a large surface area with a convex femoral condyle and concave tibial plateau, whereas the lateral compartment has a smaller surface area with a convex femoral condyle and convex lateral plateau in the sagittal plane [70]. The tibial tuberosity, the attachment site for the patellar tendon, is typically midline anteriorly but may be slightly lateral [65]. Gerdy’s tubercle, the insertion site of the iliotibial band, is located 2 to 3 cm lateral to the tibial tubercle on the proximal tibia [65]. The proximal fibula articulates with a facet on the lateral cortex of the tibia but is not part of the knee articulation [65]. The fibular head is located a mean of 1.5 cm distal to the joint line, with a range of 6 to 32 mm below the joint line [70].

The patella is the largest sesamoid bone in the body, averaging 2.5 cm in thickness [65]. It possesses the thickest articular surface in the body, measuring approximately 5 mm in the midportion and 2 mm on the sides [65]. The patellar articular surface contains a vertical central ridge separating the broader lateral facet from the medial facet, along with a smaller, more medial facet known as the odd facet [65, 70]. The odd facet is a small facet on the distal medial patella that articulates in deep flexion of the knee [70]. Patellar morphology is classified by Wiberg: Type I features medial and lateral facets of equal size; Type II, the most common, has a medial facet that is smaller and one half the size of the lateral facet; and Type III presents a medial facet so far medial that the central ridge is barely noticeable [70].

Ligamentous Anatomy

The anterior cruciate ligament (ACL) travels from the medial border of the lateral femoral condyle to its insertion site anterolateral to the medial tibial spine [42]. The ACL is composed of 90% type I collagen and 10% type III collagen [65, 66]. Its mean length is 33 mm and mean midsubstance width is 11 mm [65], with other measurements citing a length of 30 mm and diameter of 11 mm [66]. The femoral attachment is a semicircular area (20 mm long and 10 mm wide) on the posteromedial aspect of the lateral femoral condyle, divided by the bifurcate ridge and bordered by the intercondylar ridge [65, 66]. The tibial attachment is a broad, irregular, oval-shaped area (30 mm long and 10 mm wide) slightly medial and anterior to the midline, between the medial and lateral tibial spinous processes [65]. This tibial insertion is immediately medial to the attachment of the anterior horn of the lateral meniscus and posterior to the tubercle of the anterior horn of the medial meniscus [66]. The ACL contains two bundles named according to their tibial insertions: anteromedial and posterolateral [66]. The anteromedial bundle originates proximal to the bifurcate ridge and is tight in flexion, increasing anterior tibial translation at 60° and 90° of knee flexion [66, 70]. The posterolateral bundle originates distal to the bifurcate ridge and is tight in extension, responsible for preventing the pivot-shift phenomenon and stabilizing against anterior translation with 30° of knee flexion [66, 70]. The primary function of the ACL is to resist anterior tibial translation in knee flexion via the anteromedial bundle and rotatory loads in knee extension via the posterolateral bundle [66, 75].

The posterior cruciate ligament (PCL) is the largest intra-articular ligament, with an average length of 38 mm and a mean diameter at the midpoint of 13 mm [65, 70, 78]. Its cross-sectional area is approximately 120% to 150% greater than that of the ACL [78]. The PCL runs from the lateral aspect of the medial femoral condyle to the posterior aspect of the tibia, just below the joint line [42, 78]. It is most narrow in its midsubstance, fanning out at both the femoral origin and tibial insertion [78]. The femoral attachment is a broad, semicircular or crescent-shaped area on the anterolateral aspect of the medial femoral condyle, adjacent to the articular surface, with a mean length of 30 mm and mean width of 5 mm [70, 78]. In the coronal plane, this attachment is typically between 12 and 4 o'clock in the right knee and between 12 and 8 o'clock in the left knee [78]. The PCL has two distinct bundles defined by their femoral insertion: anterolateral (AL) and posteromedial (PM) [78]. The AL bundle is larger, comprising 85% of the PCL's cross-sectional area, and is stronger, stiffer, and tight in knee flexion [70, 78]. The PM bundle is tight in knee extension [70]. The insertion of the two bundles is separated by a medial bifurcate ridge [78]. The PCL inserts onto a midline depression on the tibia, 10 to 15 mm below the level of the medial and lateral tibial plateaus [70, 78]. The tibial fossa for the PCL is trapezoidal in shape [78]. The AL bundle occupies the superolateral aspect of the tibial footprint, while the PM bundle occupies the inferomedial aspect of the intercondylar fossa [78]. The primary function of the PCL is to resist posterior tibial translation at all degrees of knee flexion [66, 75].

At least one meniscofemoral ligament is present in 93% of knees [78]. These ligaments lie anterior (ligament of Humphrey) and posterior (ligament of Wrisberg) to the PCL [78]. They connect the posterior horn of the lateral meniscus to the intercondylar notch and contribute significantly to the PCL footprint and cross-sectional area, with a mean contribution of 17.2% in one cadaver study [78]. The meniscofemoral ligaments are thought to be secondary restraints to posterior translation and act to stabilize the posterior horn of the lateral meniscus [78].

The medial collateral ligament (MCL) has superficial and deep portions that stabilize the knee against valgus stresses [42, 75]. The MCL originates on the femoral sulcus approximately 3.2 cm proximal and 4.8 cm posterior to the articular surface of the femur at the knee [70]. The adductor tubercle, a prominence on the medial condyle proximal to the MCL origin, is the site of insertion of the adductor magnus muscle [70]. The superficial MCL proximal division resists valgus tibial translation, while the distal division resists tibial external rotation in knee extension [66]. The deep MCL resists valgus translation and tibial internal and external rotation [66]. The posteromedial corner, which includes the posterior oblique ligament (POL), resists valgus stress [75]. The POL resists tibial internal rotation, especially in knee extension [66].

The lateral collateral ligament (LCL), also known as the fibular collateral ligament (FCL), runs from the lateral femoral condyle to the head of the fibula [42]. It is the main stabilizer against varus stress and is part of the posterolateral “complex” or “corner” that also resists external rotation [42, 75]. The LCL resists varus tibial translation and tibial external rotation, especially at 30 degrees of knee flexion [66]. The posterolateral corner resists posterior translation, external rotation, and varus angulation of the tibia [75]. This corner is composed of the FCL, iliotibial band, popliteofibular ligament, biceps femoris, and popliteus tendon [75]. The popliteofibular ligament, present in 90% of knees, runs from the tendon of the popliteus muscle to the styloid on the posterior fibular head [42]. It resists tibial external rotation, especially in knee flexion, and posterior tibial displacement [66]. The popliteus tendon resists tibial external rotation, especially in knee flexion, and varus tibial translation [66].

The posterior joint capsule originates at the proximal margin of the posterior femoral condyles and attaches below the tibial plateau [78]. It is continuous medially with the superficial MCL and the POL [78]. A variably sized defect in the posteromedial joint capsule between the medial head of the gastrocnemius and the direct attachment of the semimembranosus is commonly present and is likely the cause of Baker's cysts [78]. The semimembranosus has multiple extensions to the posterior aspect of the knee, including proximal posterior capsular arms, distal tibial expansions, and contributions to the oblique popliteal ligament [78]. The oblique popliteal ligament is a distinct thickening of the capsule arising medially as a confluence of a semimembranosus expansion and an arm of the POL [78]. It is usually 48 mm long and widens from 9.5 mm medially to 16.4 mm at its lateral attachment [78]. The oblique popliteal ligament attaches to both the fabella and the posterior tibia just lateral to the PCL [78]. It did not attach to the lateral femoral condyle in any of the 20 knees dissected by LaPrade et al. [78]. The posterior capsule is strengthened by an expansion from the medial aspect of the popliteus that attaches to the posteromedial joint capsule [78]. The oblique popliteal ligament resists knee hyperextension and varus tibial translation [66].

Meniscal Anatomy

The menisci are C-shaped or crescent-shaped fibrocartilaginous disks with a triangular cross section that provide shock absorption, increase congruency between joint surfaces, enhance joint stability, and aid in the distribution of synovial fluid [42, 70]. They consist of type I collagen fibers arranged obliquely, radially, and vertically [70]. The menisci provide a concave surface with which the convex femoral condyles can articulate; without them, the convex femoral condyles articulate with the relatively flat tibial plateaus, decreasing surface area of contact and increasing pressure on the articular cartilage [42]. The medial meniscus is firmly attached to the joint capsule along its entire peripheral edge and attaches more anterior and posterior [42, 70]. It has less mobility than the lateral meniscus and is more susceptible to tearing when trapped between the femoral condyle and tibial plateau [42]. The lateral meniscus is circular, larger than the medial meniscus, and carries a greater share of the lateral compartment pressure than the medial meniscus carries for the medial compartment [42, 70]. The lateral meniscus is attached to the anterior and posterior capsule, but there is a region posterolaterally where it is not firmly attached [42]. The menisci are attached to collateral ligaments via coronary ligaments [70].

Vascular & Neural Supply

The middle geniculate artery is the primary blood supply to both the ACL and PCL [65, 70]. The posterior articular branch of the posterior tibial nerve provides innervation to both the ACL and PCL [65, 70]. The vascular supply of the menisci is derived from the geniculate arteries, which penetrate into 20% to 30% of the peripheral medial meniscus and 10% to 25% of the peripheral lateral meniscus [70]. The popliteus artery travels through the adductor hiatus, where it is relatively immobile, and distally through the fibrous arch deep to the soleus muscle [75]. The common peroneal nerve travels along the posterior edge of the biceps femoris and continues distally around the fibular neck [75]. The tibial nerve, after branching from the sciatic nerve, courses distally through the center of the popliteus fossa [75].

Classification

Septic arthritis of the adult knee and hip constitutes a surgical urgency most commonly caused by S. aureus, with increasing rates of MRSA [5]. The pathogen spectra of periprosthetic and native joint infections differ considerably [137]. An arthroscopic staging of the initial joint infection has prognostic and therapeutic consequences [24].

Tsukayama: A classification system popularised by Tsukayama divides periprosthetic joint infections into four categories based on the time elapsed since the operation and the pre-operative status [119]. Infections associated with prosthetic joints can be categorised into three groups: early infections (occurring within three months after surgery), delayed infections (appearing between three and 24 months after surgery), and late infections (emerging more than 24 months after surgery) [119].

Periprosthetic Infection Types: Periprosthetic infections can be considered as four types based on duration and interval from the index procedure: early postoperative, acute hematogenous, late chronic, and positive intraoperative cultures found at revision for presumed aseptic failure [128]. Early postoperative periprosthetic infections are usually seeded intraoperatively or caused by hematogenous spread and present within 4 weeks of the index procedure [128]. Acute hematogenous periprosthetic infections are characterized by an acute presentation in a previously well-functioning joint arthroplasty and may be associated with a documented or suspected bacteremia [128]. Late chronic periprosthetic infections present indolently 1 month or more after the index arthroplasty and usually represent low-grade infections thought to originate perioperatively [128]. Late chronic periprosthetic infections also include missed acute infections (early postoperative or hematogenous) that are now greater than 4 weeks in duration [128].

Staging System: A staging system for periprosthetic infections incorporates the infection classification system with the status of the host, including both systemic and local compromising factors [128]. Patients with periprosthetic joint infection are graded according to infection type (I, II, III), systemic host grade (A, B, C), and local extremity grade (1, 2, 3) [50].

Clinical Presentation

Diagnostic Criteria and Laboratory Findings

Laboratory data combined with clinical symptoms are an essential component of the proper diagnosis of septic arthritis [93]. The Kocher criteria for differentiating septic arthritis from transient synovitis include fever >101.3°F, refusal to bear weight, leukocyte count >12,000, and ESR >40 [93]. The diagnostic sensitivity for septic arthritis using the Kocher criteria was 93% when 3 criteria were positive and 99% when all 4 criteria were positive [93]. However, if the identical Kocher criteria were applied to the knee, 52% of septic knee cases could be missed [93]. One study noted only a 59% predicted probability of having septic arthritis in patients with all 4 Kocher criteria being positive [93]. Organisms such as Kingella with a less severe presentation can be missed by a strictly parameter-based approach to septic arthritis [93]. CRP greater than 2 mg/dL is an independent risk factor for septic arthritis [93]. In a modified criteria study, fever >38.5°C was the best predictor of septic arthritis, followed by an elevated CRP level, an elevated ESR, refusal to bear weight, and an elevated serum white blood cell count [93]. In the modified criteria study, patients with 5 positive criteria had a 98% chance of having septic arthritis, those meeting 4 criteria had a 93% chance, and those meeting 3 criteria had an 83% chance [93]. The efficacy of conventional microbiological testing in the diagnostics of different types of joint infections is questionable [33]. The diagnosis of septic arthritis of the knee might be improved using a machine learning-based prediction model [20].

Clinical Signs and Differential Diagnosis

In acute septic arthritis due to Clostridium welchii, local and systemic findings were similar to other pyarthroses [37]. Post-steroid septic arthritis can present with mild clinical findings but have tremendous consequences with a very long recovery time [14]. A tenosynovial giant-cell tumor should be considered as part of the differential for a patient with acute onset knee pain and effusion without a history of trauma and with a lack of systemic symptoms [106]. Hematogenous septic arthritis in an otherwise healthy individual usually is obvious clinically, and the presenting signs generally indicate that an arthrocentesis not only will yield a definitive diagnosis but also will constitute the first step in treatment [94]. A hemophiliac with acute intra-articular bleeding has a warm, swollen, and tender joint, frequently without a history of trauma; these findings are similar to those of septic arthritis [94]. The possibility of sepsis is rarely considered in hemophiliacs because the history supports the diagnosis of hemarthrosis so strongly that no further tests are performed [94]. If adequate therapy for a hemarthrosis is not immediately successful, prompt investigation for sepsis should be conducted [94].

Diagnostic Workup and Imaging

The diagnosis of septic knee arthritis must be suspected at the early stage of the disease, and diagnostic joint aspiration must be immediately performed when the diagnosis is suspected [11]. A high index of suspicion for septic knee arthritis with adjacent chronic osteomyelitis may result from careful examination of plain radiographs [19]. Further imaging studies, including CT or MRI, are essential for diagnosis of septic knee arthritis with adjacent chronic osteomyelitis [19]. MRI was excellent at distinguishing damage to the cartilage and can be useful in early follow-up evaluation of patients with septic arthritis after ACL reconstruction [27]. There was no difference in infection-free survival between culture-positive and culture-negative groups following total hip arthroplasty [9]. This case report demonstrates the importance of considering atypical prosthetic joint infection in painful total knee arthroplasty with negative cultures and equivocal laboratory results [99].

Specific Clinical Contexts

Septic arthritis developing due to migration of an intramedullary nail into the knee is an extremely rare complication [113]. K pneumoniae septic arthritis is extremely uncommon [22].

Investigations

Diagnostic Principles and Urgency: Septic arthritis of the adult knee is a surgical urgency most commonly caused by S. aureus, with increasing rates of MRSA [5]. A high index of suspicion for septic knee arthritis with adjacent chronic osteomyelitis may result from careful examination of plain radiographs, and further imaging studies, including CT or MRI, are essential for diagnosis [19].

Laboratory: The Synovasure PJI assay does not accurately diagnose native joint septic arthritis nor provide utility in distinguishing septic vs crystalline arthritis [144]. Data suggest enhanced expression and activation of MMP-9 in septic native knee arthritis compared with aseptic arthritis [147].

Other Considerations: Patients with a history of treated septic arthritis are at high risk of developing periprosthetic joint infection after total joint arthroplasty, with the risk appearing greater in knee arthroplasty compared to hip arthroplasty [7].

Post-Arthroplasty Workup: Knee periprosthetic joint infection (PJI) is more often identified by current MSIS histological than microbiological criteria [25]. Based on a low certainty of evidence, MRI and SPECT/CT are currently the most accurate modalities available to aid the diagnosis of aseptic loosening of knee arthroplasty components [121].

Treatment

Non-Operative

Medical management may achieve functional recovery comparable to surgical intervention in select patients with septic arthritis [105]. However, conservative methods often result in longer recovery periods and less favorable outcomes, particularly following ACL reconstruction, where surgery is recommended as the primary treatment [13].

Operative

Indications: Septic arthritis of the knee constitutes a surgical emergency requiring immediate diagnostic joint aspiration and rapid surgical and antibiotic care to prevent further cartilage destruction [60, 11, 103]. Multidisciplinary management, such as referral to a Bone and Joint Infection Center, significantly decreases treatment failure rates [30]. Recent or current knee sepsis is an absolute contraindication to total knee arthroplasty [46].

Surgical Approach / Technique: Arthroscopy is as effective as arthrotomy in adults, demonstrating a lower reinfection rate and less frequent initial inflammatory signs [51]. Arthroscopic treatment serves as a more successful index procedure requiring fewer total irrigation procedures compared with open treatment [16]. No significant long-term functional differences exist among arthroscopy with continuous irrigation, arthroscopic debridement alone, and open arthrotomy [4]. Arthroscopic debridement is a viable first-line option [58]. In children, arthroscopic drainage combined with antibiotic therapy provides good medium-term functional and radiological results [60]. For recalcitrant cases, complete arthroscopic synovectomy offers better visibility of gutters and less postoperative pain, facilitating early mobilization [63].

Debridement and Infection Eradication: Most septic joints (62%) are managed effectively with a single surgical debridement [18]. In post-ACL reconstruction cases, arthroscopic debridement combined with antibiotics can lead to infection eradication and graft salvage [31]. Aggressive debridement with graft and hardware removal effectively controls persistent infection [131].

Post-ACL Reconstruction Specifics: Although rare, postoperative septic arthritis after ACL reconstruction carries high morbidity, resulting in protracted hospitalization and poor clinical outcomes [2, 6]. Despite this, septic arthritis after ACLR did not result in inferior objective knee function compared with uncomplicated ACLR [3]. Autograft soaking in vancomycin reduces infection risk, with an infection rate of 0% in the vancomycin group compared to 1.85% in the control group [104]. An aggressive progression of septic arthritis and osteomyelitis after ACL reconstruction has been documented in a healthy patient [26].

Complications and Risk Factors: Intravenous drug use (IDU) is an increasing cause of septic knee admissions, associated with higher rates of mortality, reoperations, resource utilization, and leaving against medical advice [48].

Arthroplasty Considerations: Management of septic arthritis by arthroplasty yields very good functional results, with infection eradication rates of 87% in evolutive septic arthritis and 95% in quiescent septic arthritis [8]. A short-interval two-stage approach for acutely septic osteoarthritic knees shows consistent infection eradication at 1-year follow-up, with range of motion and knee scores comparing favorably to other case series [10]. Staged joint replacement significantly improves knee mobility and HSS scores [21]. Tantalum metaphyseal cones provide excellent clinical and radiographic midterm outcomes with a low complication rate for severe bone defects in septic knee revision [56].

Salvage Procedures: When the knee is not amenable to reconstruction, arthrodesis is the last option to obtain a painless, stable knee [45]. The most common indication is a nonreconstructable failed TKA, usually due to infection and extensor mechanism loss [45]. Less common indications include septic arthritis, osteomyelitis, posttraumatic arthritis in young manual laborers, painful ankylosis, neuropathic knee, and paralytic deformity [45]. Contraindications include bilateral knee involvement and ipsilateral hip arthrodesis [45]. Complications include painful nonunion (most common), infection, deep vein thrombosis, peroneal nerve palsy, and wound dehiscence [45]. Positioning depends on limb-length discrepancy: if less than 2 cm, the knee is placed in 5° to 7° of valgus and 15° of flexion; if 2 to 4 cm, the knee is placed in extension for ground clearance; if greater than 4 cm, bone grafting or a prosthetic spacer may be considered [45]. Functional results using a modular customized intramedullary nail are comparable to literature standards, with the technique being simple and reliable [52].

Complications

Infection Persistence and Recurrence: Diagnosis of septic knee arthritis with adjacent chronic osteomyelitis requires a high index of suspicion derived from careful examination of plain radiographs, supplemented by essential further imaging studies including CT or MRI [19]. In the context of periprosthetic joint infection (PJI), the risk of failure after one-year follow-up is high following revision surgery [54]. Specifically, survivorship free from persistent PJI at 1 year is low at 76% in unicompartmental knee arthroplasty treated with debridement, antibiotics, and implant retention [29].

Postoperative Complications Following Ligament Reconstruction: Postoperative septic arthritis is a rare but serious complication following arthroscopic ACL reconstruction [17], with a reported prevalence of 1.8% in one series [41]. An aggressive progression of septic arthritis and osteomyelitis has been presented in a healthy patient after ACL reconstruction [26]. Similarly, postoperative septic arthritis after arthroscopic PCL and complex knee ligament reconstructions is a rare but serious complication [38].

Surgical Outcomes and Complication Rates: The probability of treatment failure, defined as removal of implants, was not significantly different between patients treated with a single irrigation and debridement and those subjected to additional procedures for periprosthetic joint infections [120]. However, the interval between serial irrigation and debridements was a significant factor determining outcomes in patients treated with multiple procedures for periprosthetic joint infections [120]. Patients treated with multiple irrigation and debridements for periprosthetic joint infections had a significantly higher prevalence of peripheral vascular disease [120].

Long-Term Joint Outcomes and Arthroplasty Risks: Management of septic arthritis by arthroplasty using a specific protocol yielded very good functional results in both knee and hip, with 87% eradication of infection in evolutive septic arthritis and 95% in quiescent septic arthritis [8]. Single-stage total knee arthroplasty is a suitable option for patients with a prior septic arthritis of the knee, provided that proper surgical technique and the utilization of systemic and local antibiotics are employed [15]. Consistent infection eradication was found at a 1-year follow-up with postoperative range of motion and knee scores comparing favourably with those of other case series in patients undergoing short-interval two-stage approach to primary total knee arthroplasty for acutely septic osteoarthritic knees [10]. Knee mobility and HSS scores were significantly improved postoperation in both treatment groups undergoing staged joint replacement for septic arthritic knee [21].

Wound Complications: Wound complications after total knee arthroplasty increase cost, length of hospitalization, readmission rates, and the risk of deep infection [127].

Aseptic Loosening: Aseptic loosening became more important with longer follow-up in the context of modern knee arthroplasty failure analysis [125].

Other Considerations: It is important to direct empirical antimicrobials at MRSA in patients presenting with adult haematogenous native joint septic arthritis, especially those with recent health care system exposure [34].

Recovery

Light activity (weeks): The evidence provided does not specify a typical week range for light activity, desk work, driving, or light activities of daily living.

Full activity (months): The evidence provided does not specify a month range for the return to manual work, sport, or full range of motion and strength.

Complete recovery / outcome plateau (months): The evidence provided does not specify a month range for the stabilization of pain, strength, and final functional outcomes.

Rehabilitation protocol: The evidence provided does not detail specific physical therapy phasing, immobilisation duration, weight-bearing or range-of-motion progression schedules, or timing for sling or brace removal.

Functional milestones: Postoperative septic arthritis following ACL reconstruction carries a high morbidity that results in poor clinical outcome [2] and, in arthroscopically guided cases, protracted hospitalization and ultimately a less favorable clinical outcome [6]. Management of septic arthritis by arthroplasty using the present protocol gave very good functional results in both knee and hip [8]. Consistent infection eradication was found at a 1-year follow-up with postoperative range of motion and knee scores comparing favourably with those of other case series for short-interval two-stage primary total knee arthroplasty in acutely septic osteoarthritic knees [10]. One-stage revision of septic knee prostheses achieved an infection control rate of 95% and higher knee scores than reported for two-stage revisions [53]. Two-stage re-implantation with an articulating spacer for infected total knee arthroplasty effectively treats infection and gives excellent knee motion between stages, and at mid- to long-term follow-up [138].

Other Considerations: Surgery is recommended as the primary treatment for septic arthritis after ACL reconstruction, noting that while conservative methods can be effective in some cases, they often result in longer recovery periods and less favorable outcomes [13]. MRI was excellent at distinguishing damage to the cartilage and can be useful in early follow-up evaluation of patients with septic arthritis after ACL reconstruction, in contrast to radiograph analyses [27]. Infection eradication rates for arthroplasty following septic arthritis were 87% in evolutive septic arthritis and 95% in quiescent septic arthritis [8]. Survivorship free from persistent periprosthetic joint infection at 1 year is low at 76% but is consistent with similar reports of DAIRs for total knee arthroplasties [29]. The prognosis for complete return of joint function in Hemophilus influenzae septic arthritis is excellent if appropriate therapy is initiated promptly [47]. Periprosthetic joint infection led to the poorer survivorship free of any revision of 70% at 10 years in patients with neuropathic (Charcot) arthropathy undergoing primary total knee arthroplasty [134]. Successful outcomes are possible with prolonged combination antibiotics and often require 2-stage revision arthroplasty for Brucella periprosthetic joint infections following total knee arthroplasty [148]. The two-stage procedure for the treatment of infected arthritic knees after failed eradication surgery was effective in all patients [149].

Key Evidence

  • [L3] Persistence or recurrence of clinical signs of infection after management of septic knee arthritis in adults should raise the suspicion of adjacent osteomyelitis, especially in patients with comorbid conditions. [1] (10.1097/01.blo.0000229336.44524.65)
  • [L4] Although postoperative septic arthritis is rare after ACL reconstruction, it carries a high morbidity that results in poor clinical outcome. [2] (10.1007/s00167-009-0793-1)
  • [L3] Septic arthritis after ACLR did not result in inferior objective knee function compared with uncomplicated ACLR. [3] (10.1016/j.arthro.2014.03.019)
  • [L3] No significant long-term functional differences were observed among the three surgical methods used to treat septic arthritis of the knee. [4] (10.1186/s12891-025-08724-7)
  • [L5] Septic arthritis of the adult knee and hip is a surgical urgency most commonly caused by S aureus with increasing MRSA rates. [5] (10.1016/j.arth.2019.10.062)
  • [L4] Although postoperative septic arthritis is rare after arthroscopically guided ACL reconstruction, it carries a high morbidity that results in protracted hospitalization and ultimately a less favorable clinical outcome. [6] (10.1177/03635465990270050301)
  • [L3] Patients with a history of treated septic arthritis are at high risk of developing periprosthetic joint infection after total joint arthroplasty, with the risk appearing greater in knee arthroplasty compared to hip arthroplasty. [7] (10.1097/corr.0000000000000734)
  • [L4] Management of septic arthritis by arthroplasty using the present protocol gave very good functional results in both knee and hip, with 87% of eradication of infection in evolutive septic arthritis and 95% in quiescent septic arthritis. [8] (10.1016/j.otsr.2010.06.009)
  • [L3] In the knee, such cases had inferior infection-free survival at two years compared with those with negative cultures; there was no difference between the groups following THA. [9] (10.1302/0301-620x.99b11.bjj-2016-0655.r2)
  • [L5] Consistent infection eradication was found at a 1-year follow-up with postoperative range of motion and knee scores comparing favourably with those of other case series. [10] (10.1007/s00167-016-3982-8)
  • [L4] The diagnosis of septic knee arthritis must be suspected at the early stage of the disease, and diagnostic joint aspiration must be immediately performed when the diagnosis is suspected. [11] (10.1007/s00167-006-0224-5)
  • [L4] The authors recommend surgery as the primary treatment for septic arthritis after ACL reconstruction, noting that while conservative methods can be effective in some cases, they often result in longer recovery periods and less favorable outcomes. [13] (10.1016/j.arthro.2009.06.012)
  • [L4] Post-steroid septic arthritis can present with mild clinical findings but have tremendous consequences with a very long recovery time. [14] (10.1007/s00167-008-0679-7)
  • [L3] Single-stage TKA is a suitable option for patients with a prior septic arthritis of the knee, provided that proper surgical technique and the utilization of systemic and local antibiotics are employed. [15] (10.1016/j.arth.2020.02.065)
  • [L3] Arthroscopic treatment for acute native knee septic arthritis was a more successful index procedure and required fewer total irrigation procedures compared with open treatment. [16] (10.2106/jbjs.16.00110)
  • [L4] Postoperative septic arthritis is rare but serious after arthroscopic ACL reconstruction. [17] (10.1177/0363546515603054)
  • [L4] Most (62%) of the septic joints were managed effectively with a single surgical debridement. [18] (10.2106/jbjs.n.00593)
  • [L4] A high index of suspicion may result from careful examination of plain radiographs, and further imaging studies, including CT or MRI, are essential for diagnosis of septic knee arthritis with adjacent chronic osteomyelitis. [19] (10.1007/s00167-009-0976-9)
  • [L3] The diagnosis of septic arthritis of the knee might be improved using a machine learning-based prediction model. [20] (10.1007/s00167-020-06418-2)
  • [L4] Knee mobility and HSS scores were significantly improved postoperation in both treatment groups. [21] (10.1186/s13018-020-02062-1)
  • [L5] K pneumoniae septic arthritis is extremely uncommon. [22] (10.1016/j.arth.2007.12.018)
  • [L1] Based on the available evidence, arthroscopy for the treatment of septic arthritis of the knee results in a lower reoperation rate than arthrotomy. [23] (10.1136/jisakos-2018-000269)
  • [L4] An arthroscopic staging of the initial joint infection has prognostic and therapeutic consequences. [24] (10.1007/s001670000129)
  • [L3] Knee PJI is more often identified by current MSIS histological than microbiological criteria. [25] (10.1007/s00402-019-03159-x)
  • [L4] The authors presented a previously unpublished aggressive progression of septic arthritis and osteomyelitis after ACL reconstruction in a healthy patient. [26] (10.1007/s00167-007-0424-7)
  • [L2] In contrast to radiograph analyses, MRI was excellent at distinguishing damage to the cartilage and can be useful in early follow-up evaluation of patients with septic arthritis after ACL reconstruction. [27] (10.1177/23259671211052519)
  • [L3] Survivorship free from persistent PJI at 1 year is low at 76% but is consistent with similar reports of DAIRs for total knee arthroplasties. [29] (10.1016/j.arth.2020.02.036)
  • [L3] Multidisciplinary management of septic arthritis improved treatment success, with the failure rate significantly decreasing after setting up the Bone and Joint Infection Referral Center. [30] (10.1016/j.otsr.2018.08.006)
  • [L1] Arthroscopic debridement combined with antibiotic treatment can lead to successful eradication of infection and graft salvage, with satisfactory functional outcomes in many cases of septic arthritis following ACL reconstruction. [31] (10.1302/0301-620x.98b5.35990)
  • [L3] Patients undergoing arthroscopic treatment of septic arthritis of the knee showed no difference in relative risk of perioperative complications, length of stay, or hospital cost compared with patients who underwent open arthrotomy. [32] (10.1055/s-0039-1693450)
  • [L4] Based on our data, the efficacy of conventional microbiological testing in the diagnostics of different type of joint infections is questionable. [33] (10.1016/j.injury.2020.02.058)
  • [L3] It is important to direct empirical antimicrobials at MRSA in patients presenting with adult haematogenous native joint septic arthritis, especially those with recent health care system exposure. [34] (10.1007/s00402-007-0285-z)
  • [L1] There is conflicting evidence regarding the benefit of extended (>24 hours) antibiotics, IV or PO, after TJA. [36] (10.5435/jaaos-d-21-00977)
  • [L4] In acute septic arthritis due to Clostridium welchii, local and systemic findings were similar to other pyarthroses, with apparently little or no cartilage destruction and subsequent excellent functional recovery. [37] (10.2106/00004623-196850060-00015)
  • [L4] Postoperative septic arthritis after arthroscopic PCL and complex knee ligament reconstructions is a rare but serious complication. [38] (10.1007/s00167-018-4902-x)
  • [L3] Continued investigation is required to determine the fate of infected joints that undergo DAIR with regard to ultimate patient outcome. [39] (10.1097/corr.0000000000003138)
  • [L3] Salvage of an infection-free prosthetic knee was achieved in only about two thirds of the cases. [40] (10.1016/j.arth.2010.04.017)
  • [L4] The prevalence of septic arthritis after an ACL reconstruction in this series was 1.8%. [41] (10.1007/s00167-012-2264-3)
  • [L4] The prognosis for complete return of joint function in this infection is excellent if appropriate therapy is initiated promptly. [47] (10.2106/00004623-197456020-00021)
  • [L3] IDU is increasingly the cause of septic knee admissions and is associated with higher rates of mortality, reoperations, resource utilization, and leaving against medical advice. [48] (10.1097/01.blo.0000534682.68856.d8)
  • [L2] [50] (10.1007/s00264-011-1267-x)
  • [L1] Arthroscopy is as effective as arthrotomy in the treatment of septic arthritis of the knee in adults, but arthroscopy has demonstrated a lower reinfection rate and less frequent clinical signs of initial inflammatory reaction. [51] (10.1007/s00167-015-3918-8)
  • [L4] The functional results are comparable to those in the literature, and the technique is simple and reliable. [52] (10.1016/j.otsr.2009.07.006)
  • [L3] One-stage revision of septic knee prostheses achieved an infection control rate of 95% and higher knee scores than reported for two-stage revisions. [53] (10.1007/s11999-011-2174-6)
  • [L3] The risk of failure after one-year follow-up is high after revision for periprosthetic joint infection. [54] (10.1002/ksa.12762)
  • [L3] Excellent clinical and radiographic midterm outcomes were achieved with a low complication rate. [56] (10.1016/j.arth.2018.08.026)
  • [L3] For high-risk candidates, articulating spacers can preserve knee function, reduce morbidity from second-stage surgery, and lower the costs with similar rates of infection clearance as 2-stage exchange. [57] (10.1016/j.arth.2023.01.036)
  • [L3] These findings conclude that arthroscopic debridement can be an alternative first-line option in managing septic arthritis. [58] (10.1007/s00167-018-5328-1)
  • [L4] [60] (10.1016/j.otsr.2015.09.007)
  • [L4] This knee arthrodesis technique proved effective with no failures in this short series, especially in cases of primary infection. [61] (10.1016/j.otsr.2009.04.006)
  • [Paper] [63] (10.1016/j.eats.2016.11.002)
  • [L5] [93] (10.5435/jaaos-d-20-00835)
  • [Case_report] [94] (10.2106/00004623-198365020-00021)
  • [L5] This case report demonstrates the importance of considering atypical prosthetic joint infection in painful total knee arthroplasty with negative cultures and equivocal laboratory results. [99] (10.5435/jaaosglobal-d-21-00183)
  • [L3] [104] (10.1007/s00167-014-3438-y)
  • [L3] Medical methods may be as effective as surgical methods for functional recovery in patients with septic arthritis. [105] (10.1186/s12891-024-08147-w)
  • [L5] This case illustrates that TGCT should be considered as part of the differential for a patient with acute onset knee pain and effusion without a history of trauma and with a lack of systemic symptoms. [106] (10.5435/jaaosglobal-d-20-00089)
  • [L5] Septic arthritis developing due to migration of an intramedullary nail into the knee is an extremely rare complication. [113] (10.1016/s0020-1383(13)70143-8)
  • [L1] [119] (10.1016/j.jisako.2023.09.003)
  • [L3] [120] (10.1016/j.arth.2015.06.051)
  • [L3] Based on a low certainty of evidence, MRI and SPECT/CT are currently the most accurate modalities available to aid the diagnosis of aseptic loosening of knee arthroplasty components. [121] (10.1002/ksa.12206)
  • [L3] Aseptic loosening became more important with longer followup. [125] (10.1007/s11999-017-5396-4)
  • [L5] Wound complications after total knee arthroplasty increase cost, length of hospitalization, readmission rates, and the risk of deep infection; prevention is ideal through optimal patient health, careful planning, and detailed postoperative care. [127] (10.1016/j.arth.2007.03.014)
  • [L4] [128] (10.1007/s11999-010-1293-9)
  • [L4] We believe that two-stage reimplantation remains a viable treatment option for patients who have an infection with a resistant organism at the site of a total knee replacement. [130] (10.2106/jbjs.e.01192)
  • [L4] Aggressive debridement with graft and hardware removal effectively controls infection in persistent septic arthritis of the knee after ACL reconstruction. [131] (10.1097/01.blo.0000181499.49740.e5)
  • [L4] While 10-year survivorship free of aseptic revision was 88%, periprosthetic joint infection led to the poorer survivorship free of any revision of 70% at 10 years. [134] (10.1016/j.arth.2018.04.003)
  • [L3] The pathogen spectra of periprosthetic and native joint infections differ considerably. [137] (10.1186/s13018-021-02850-3)
  • [L4] Two-stage re-implantation with an articulating spacer for infected TKA effectively treats infection and gives excellent knee motion between stages, and at mid- to long-term follow-up. [138] (10.1016/j.arth.2008.04.003)
  • [L4] The Synovasure PJI assay does not accurately diagnose native joint septic arthritis nor provide utility in distinguishing septic vs crystalline arthritis. [144] (10.1016/j.arth.2021.03.020)
  • [L4] The data presented suggest enhanced expression and activation of MMP-9 in septic native knee arthritis compared with aseptic. [147] (10.1007/s00167-011-1676-9)
  • [L3] Successful outcomes are possible with prolonged combination antibiotics and often require 2-stage revision arthroplasty, though diagnostic and treatment approaches vary widely. [148] (10.2106/jbjs.rvw.25.00079)
  • [L4] The two-stage procedure for the treatment of infected arthritic knees after failed eradication surgery was effective in all patients. [149] (10.1007/s00167-020-06106-1)

See Also

References

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d. Effective Technological Measures means those measures that, in the absence of proper authority, may not be circumvented under laws fulfilling obligations under Article 11 of the WIPO Copyright Treaty adopted on December 20, 1996, and/or similar international agreements.

e. Exceptions and Limitations means fair use, fair dealing, and/or any other exception or limitation to Copyright and Similar Rights that applies to Your use of the Licensed Material.

f. Licensed Material means the artistic or literary work, database, or other material to which the Licensor applied this Public License.

g. Licensed Rights means the rights granted to You subject to the terms and conditions of this Public License, which are limited to all Copyright and Similar Rights that apply to Your use of the Licensed Material and that the Licensor has authority to license.

h. Licensor means the individual(s) or entity(ies) granting rights under this Public License.

i. NonCommercial means not primarily intended for or directed towards commercial advantage or monetary compensation. For purposes of this Public License, the exchange of the Licensed Material for other material subject to Copyright and Similar Rights by digital file-sharing or similar means is NonCommercial provided there is no payment of monetary compensation in connection with the exchange.

j. Share means to provide material to the public by any means or process that requires permission under the Licensed Rights, such as reproduction, public display, public performance, distribution, dissemination, communication, or importation, and to make material available to the public including in ways that members of the public may access the material from a place and at a time individually chosen by them.

k. Sui Generis Database Rights means rights other than copyright resulting from Directive 96/9/EC of the European Parliament and of the Council of 11 March 1996 on the legal protection of databases, as amended and/or succeeded, as well as other essentially equivalent rights anywhere in the world.

l. You means the individual or entity exercising the Licensed Rights under this Public License. Your has a corresponding meaning.

Section 2 -- Scope.

a. License grant.

1. Subject to the terms and conditions of this Public License, the Licensor hereby grants You a worldwide, royalty-free, non-sublicensable, non-exclusive, irrevocable license to exercise the Licensed Rights in the Licensed Material to:

a. reproduce and Share the Licensed Material, in whole or in part, for NonCommercial purposes only; and

b. produce, reproduce, and Share Adapted Material for NonCommercial purposes only.

2. Exceptions and Limitations. For the avoidance of doubt, where Exceptions and Limitations apply to Your use, this Public License does not apply, and You do not need to comply with its terms and conditions.

3. Term. The term of this Public License is specified in Section 6(a).

4. Media and formats; technical modifications allowed. The Licensor authorizes You to exercise the Licensed Rights in all media and formats whether now known or hereafter created, and to make technical modifications necessary to do so. The Licensor waives and/or agrees not to assert any right or authority to forbid You from making technical modifications necessary to exercise the Licensed Rights, including technical modifications necessary to circumvent Effective Technological Measures. For purposes of this Public License, simply making modifications authorized by this Section 2(a) (4) never produces Adapted Material.

5. Downstream recipients.

a. Offer from the Licensor -- Licensed Material. Every recipient of the Licensed Material automatically receives an offer from the Licensor to exercise the Licensed Rights under the terms and conditions of this Public License.

b. No downstream restrictions. You may not offer or impose any additional or different terms or conditions on, or apply any Effective Technological Measures to, the Licensed Material if doing so restricts exercise of the Licensed Rights by any recipient of the Licensed Material.

6. No endorsement. Nothing in this Public License constitutes or may be construed as permission to assert or imply that You are, or that Your use of the Licensed Material is, connected with, or sponsored, endorsed, or granted official status by, the Licensor or others designated to receive attribution as provided in Section 3(a)(1)(A)(i).

b. Other rights.

1. Moral rights, such as the right of integrity, are not licensed under this Public License, nor are publicity, privacy, and/or other similar personality rights; however, to the extent possible, the Licensor waives and/or agrees not to assert any such rights held by the Licensor to the limited extent necessary to allow You to exercise the Licensed Rights, but not otherwise.

2. Patent and trademark rights are not licensed under this Public License.

3. To the extent possible, the Licensor waives any right to collect royalties from You for the exercise of the Licensed Rights, whether directly or through a collecting society under any voluntary or waivable statutory or compulsory licensing scheme. In all other cases the Licensor expressly reserves any right to collect such royalties, including when the Licensed Material is used other than for NonCommercial purposes.

Section 3 -- License Conditions.

Your exercise of the Licensed Rights is expressly made subject to the following conditions.

a. Attribution.

1. If You Share the Licensed Material (including in modified form), You must:

a. retain the following if it is supplied by the Licensor with the Licensed Material:

i. identification of the creator(s) of the Licensed Material and any others designated to receive attribution, in any reasonable manner requested by the Licensor (including by pseudonym if designated);

ii. a copyright notice;

iii. a notice that refers to this Public License;

iv. a notice that refers to the disclaimer of warranties;

v. a URI or hyperlink to the Licensed Material to the extent reasonably practicable;

b. indicate if You modified the Licensed Material and retain an indication of any previous modifications; and

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.