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Sagittal Band Rupture (Boxer's Knuckle)

Sagittal band injury with extensor subluxation: Rayan-Murray classification, relative-motion splinting vs repair/reconstruction, boxer's knuckle vs spontaneous.

Overview

Sagittal band rupture, or Boxer's knuckle, involves radial dislocation of the extensor tendon when the band is partially divided [1]. Even minimal damage causes measurable subluxation, though 10% intact fibers confer stability against this displacement [3]. Complications of such injuries include volar subluxation of the MCP joints, extensor quadriga, swan neck deformity, and subsequent joint contractures [9].

Surgical management consists of radial sagittal band repair or reconstruction, often utilizing anomalous extensor slips to the middle finger for added stability [5, 6]. Centralization of the extensor tendon and sagittal band repair is the treatment of choice for professional athletes [4]. Precisely executed operative treatment results in pain relief, functional restoration, and unrestricted return to competition for the vast majority of boxers [2].

Conservative management is feasible for middle and ring finger dislocations and serves as a reasonable first-line treatment for chronic incompetence [1, 11]. An MCP joint blocking orthosis or extension orthosis yields satisfactory results in 71% of patients, achieving good to excellent outcomes or resolution of symptomatic translocation [8, 12]. However, manual labor, longer symptom duration, and Grade III injury are associated with higher treatment failure rates in nonsurgical cases [12]. A modified classification system has been proposed to guide treatment and standardize documentation [7].

Anatomy & Pathophysiology

Dislocation of the extensor tendon may occur when the radial sagittal band is only partially divided [1], while even minimal damage to the sagittal band results in measurable subluxation of the extensor tendon [3]. The presence of 10% intact sagittal band fibers confers some stability against subluxation [3]. Injury to an extensor tendon and/or sagittal band may lead to volar subluxation of the metacarpophalangeal (MCP) joints [9], extensor quadriga [9], swan neck deformity [9], or subsequent joint contractures [9].

Severe flexion deformity of the MCP joint from the combined forces of the extrinsic digital flexors and intrinsic muscles results in great tension in the retinacular ligaments of the extensor mechanism, particularly the sagittal band [27]. This tension can lead to attenuation of the sagittal band and subsequent extensor tendon dislocation [27]. Knowledge of thumb sagittal band anatomy supports repair of radial sagittal band injuries to prevent tendon instability [24].

Classification

Pathophysiology and Phenotypes: Dislocation of the extensor tendon may occur when the radial sagittal band is only partially divided [1], and even minimal sagittal band damage results in measurable subluxation of the extensor tendon [3]. The presence of 10% intact sagittal band fibers confers some stability against subluxation [3]. Sagittal band injuries may lead to volar subluxation of the metacarpophalangeal (MCP) joints [9], extensor quadriga [9], swan neck deformity [9], and subsequent joint contractures [9].

Familial Considerations: Six cases of extensor tendon dislocation in the same family suggest a possible familial predisposition potentially due to genetic weakness in the sagittal bands or common environmental factors [14]. However, the condition of extensor tendon dislocation is not proven to be truly genetic [14].

Other Considerations: A review provides a contemporary perspective on sagittal band injuries and describes a modification to the most prevalent classification system to guide treatment and allow standardization in documenting and describing injuries [7].

Clinical Presentation

Traumatic extensor tendon dislocation may occur when the radial sagittal band is only partially divided [1], as even minimal damage results in measurable subluxation of the extensor tendon [3]. The presence of 10% intact sagittal band fibers confers some stability against subluxation [3], though injuries frequently lead to volar subluxation of the metacarpophalangeal (MCP) joints [9].

Inspection and palpation may reveal the dislocated tendon, which is crucial to recognize in a boxer [10]. While nonoperative treatment is generally unsuccessful [10], accurate recognition and treatment are vital. Early diagnosis and repair of an acute, displaced, complete radial collateral ligament avulsion with injury to the sagittal band of the small finger MCP joint is associated with a good outcome [15].

Range-of-motion and stability testing may demonstrate extensor quadriga [9], swan neck deformity [9], or subsequent joint contractures [9]. Surgical reconstruction is required for optimal return to function in cases where nonoperative treatment fails [10].

Familial patterns exist, with six cases of extensor tendon dislocation in the same family suggesting a possible predisposition [14]. This familial predisposition may be due to a genetic weakness in the sagittal bands or common environmental factors [14], though the condition is not proven to be truly genetic [14].

Investigations

Clinical Assessment and Classification: Dislocation of the extensor tendon may occur when the radial sagittal band is only partially divided [1], and even minimal sagittal band damage results in measurable subluxation of the extensor tendon [3]. The presence of 10% intact sagittal band fibers confers some stability against subluxation [3]. Sagittal band injuries may lead to volar subluxation of the metacarpophalangeal (MCP) joints, extensor quadriga, swan neck deformity, and subsequent joint contractures [9]. A modification to the most prevalent classification system for sagittal band injuries has been described to guide treatment and allow standardization in documenting and describing injuries [7].

Prognostic Factors and Etiology: Six cases of extensor tendon dislocation in the same family suggest a possible familial predisposition potentially due to genetic weakness in the sagittal bands or common environmental factors [14], though the condition of extensor tendon dislocation is not proven to be truly genetic [14]. Manual labor is associated with a higher likelihood of treatment failure in nonsurgically treated sagittal band injuries [12]. Longer symptom duration is associated with a higher likelihood of treatment failure in nonsurgically treated sagittal band injuries [12]. Grade III injury is associated with a higher likelihood of treatment failure in nonsurgically treated sagittal band injuries [12].

Other Considerations: An MCP extension orthosis for sagittal band injury led to mostly satisfactory results with 71% of patients achieving resolution of symptomatic tendon translocation [12]. An MCP joint blocking orthosis for sagittal band injury led to mostly satisfactory results, with 71% of patients achieving good to excellent outcomes [8]. Splinting the injured digit in neutral or hyperextension can successfully treat acute sagittal band injuries [13]. Splintage is a reasonable first line of treatment for chronic sagittal band incompetence before advising surgical intervention [11]. Accurate recognition and treatment is crucial for traumatic extensor tendon dislocation in a boxer as nonoperative treatment is generally unsuccessful [10]. Surgical reconstruction is required for optimal return to function in traumatic extensor tendon dislocation in a boxer [10]. Early diagnosis and repair of an acute, displaced, complete radial collateral ligament avulsion with injury to the sagittal band of the small finger MCP joint is associated with a good outcome [15]. Surgical management of closed sagittal band injury consists of repair or reconstruction of the radial sagittal band, with numerous adjunctive techniques described to prevent subluxation [6]. An anomalous slip of the extensor tendon to the middle finger can be a resource for surgical reconstruction that adds stability to primary sagittal band repair [5]. Centralization of the extensor tendon and sagittal band repair is recommended as the treatment of choice for Boxer's knuckle in professional athletes [4]. Precisely executed operative treatment of Boxer's knuckle has resulted in an expectant favorable outcome, with the vast majority of boxers experiencing relief of pain, restoration of function, and an unrestricted return to competition [2]. Relative motion splinting after long extensor repair and sagittal band ruptures with tendon subluxation permitted 98% recovery of flexion and 96% recovery of total active motion compared with the normal uninjured side in a series of 180 patients [20].

Treatment

Non-Operative

Conservative management is feasible for partial radial sagittal band divisions in the middle and ring fingers, as even 10% intact fibers confer stability against subluxation [1, 3]. Acute closed injuries in non-rheumatoid patients can be successfully treated with a sagittal band bridge or splinting in neutral or hyperextension, yielding results comparable to surgical reconstruction without scar formation [13, 19]. Splintage serves as a reasonable first-line treatment for chronic sagittal band incompetence prior to considering surgery [11]. While MP joint blocking orthoses have produced satisfactory results in 71% of patients with good to excellent outcomes, nonoperative treatment of traumatic extensor tendon dislocation in boxers is generally unsuccessful, often necessitating surgical reconstruction for optimal functional return [8, 10].

Operative

Indications: Surgical intervention is indicated for Boxer's knuckle and traumatic carpal boss to achieve pain relief, functional restoration, and unrestricted return to competition [2]. Centralization of the extensor tendon and sagittal band repair is the treatment of choice for professional athletes [4].

Surgical Approach / Technique: Surgical management of closed sagittal band injuries involves repair or reconstruction of the radial sagittal band, utilizing numerous adjunctive techniques to prevent subluxation [6]. For chronic nontraumatic extensor tendon subluxations, an operative approach under local anesthesia allows optimal tension placement through active intraoperative observation of flexion and extension [25]. An anomalous slip of the extensor tendon to the middle finger may be utilized as a resource for surgical reconstruction to add stability to primary sagittal band repair [5].

Other Considerations: A modification to the most prevalent classification system for sagittal band injuries has been described to guide treatment and standardize the documentation and description of these injuries [7].

Complications

Instability: Partial division of the radial sagittal band may result in tendon dislocation [1], while minimal damage results in measurable extensor tendon subluxation [3]. The presence of 10% intact sagittal band fibers confers some stability against subluxation [3]. Extensor tendon and/or sagittal band injury may lead to volar subluxation of the metacarpophalangeal joints [9]. Nonoperative treatment of traumatic extensor tendon dislocation in a boxer is generally unsuccessful [10].

Extensor-mechanism: Extensor tendon and/or sagittal band injury may lead to extensor quadriga [9], swan neck deformity [9], and subsequent joint contractures [9].

Other Considerations: Six cases in the same family suggest a possible familial predisposition to extensor tendon dislocation [14]. This predisposition may be due to genetic weakness in the sagittal bands or common environmental factors [14], though the condition is not proven to be truly genetic [14].

Recovery

Light activity (weeks): Acute closed sagittal band injuries in non-rheumatoid patients can be successfully treated with conservative management using a sagittal band bridge, while acute injuries can also be managed by splinting the injured digit in neutral or hyperextension [13, 19]. Conservative treatment is feasible when the radial sagittal band is only partially divided [1]. An MCP extension orthosis or MP joint blocking orthosis for sagittal band injury led to mostly satisfactory results, with 71% of patients achieving good to excellent outcomes or resolution of symptomatic tendon translocation [8, 12].

Full activity (months): Operative treatment of Boxer's knuckle and traumatic carpal boss results in relief of pain, restoration of function, and an unrestricted return to competition in the vast majority of cases [2]. Centralization of the extensor tendon and sagittal band repair is recommended as the treatment of choice for Boxer's knuckle in professional athletes [4]. Surgical management consists of repair or reconstruction of the radial sagittal band, with numerous adjunctive techniques described to prevent subluxation, including the use of an anomalous slip of the extensor tendon to the middle finger to add stability to primary repair [5, 6]. Relative motion splinting after long extensor repair and sagittal band ruptures with tendon subluxation permitted 98% recovery of flexion and 96% recovery of total active motion compared with the normal uninjured side in a series of 180 patients [20].

Complete recovery / outcome plateau (months): Early diagnosis and repair of an acute, displaced, complete radial collateral ligament avulsion with injury to the sagittal band of the small finger MCP joint is associated with a good outcome [15]. Conservative management using a sagittal band bridge produces results comparable to surgical reconstruction without associated scar formation [19].

Rehabilitation protocol: Conservative treatment of tendon dislocation in the middle and ring fingers is feasible when the radial sagittal band is only partially divided [1]. Even minimal sagittal band damage results in measurable subluxation, though the presence of even 10% intact sagittal band fibers confers some stability against subluxation [3]. A modified classification system for sagittal band injuries is available to guide treatment and allow standardization in documenting and describing injuries [7].

Functional milestones: Nonoperative treatment of traumatic extensor tendon dislocation in a boxer is generally unsuccessful, and surgical reconstruction is required for optimal return to function [10]. Manual labor is associated with a higher likelihood of treatment failure in nonsurgically treated sagittal band injuries [12]. Longer symptom duration is associated with a higher likelihood of treatment failure in nonsurgically treated sagittal band injuries [12]. Grade III injury is associated with a higher likelihood of treatment failure in nonsurgically treated sagittal band injuries [12].

Key Evidence

  • [L5] Dislocation may occur when the radial sagittal band is only partially divided, which may explain why conservative treatment of tendon dislocation in the middle and ring fingers is feasible. (10.1177/1753193420963257)
  • [L4] Precisely executed operative treatment of both injuries has resulted in an expectant favorable outcome, as in the vast majority of cases the boxers have experienced relief of pain, restoration of function, and an unrestricted return to competition. (10.1016/j.csm.2009.06.004)
  • [L5] Even minimal sagittal band damage results in measurable subluxation, but the presence of even 10% intact fibers confers some stability against subluxation. (10.1016/j.jhsa.2025.04.026)
  • [L4] The authors recommend centralization of the extensor tendon and sagittal band repair as the treatment of choice for this injury. (10.1177/03635465000280061701)
  • [L4] An anomalous slip of the extensor tendon to the middle finger can be a resource for surgical reconstruction that adds stability to primary sagittal band repair. (10.1016/j.jhsa.2012.05.029)
  • [L5] Surgical management consists of repair or reconstruction of the radial sagittal band, with numerous adjunctive techniques described to prevent subluxation. (10.5435/jaaos-d-13-00203)
  • [L4] This review provides a contemporary perspective on sagittal band injuries and describes a modification to the most prevalent classification system to guide treatment and allow standardization in documenting and describing injuries. (10.1016/j.jhsa.2021.09.011)
  • [L4] MP joint blocking orthosis for sagittal band injury led to mostly satisfactory results, with 71% of patients achieving good to excellent outcomes. (10.1016/j.jhsa.2018.06.113)
  • [Paper] An extensor tendon and/or sagittal band injury may lead to a number of complications including volar subluxation of the MCP joints, extensor quadriga, swan neck deformity, and subsequent joint contractures. (10.1007/s12593-015-0172-8)
  • [L5] Accurate recognition and treatment is crucial as nonoperative treatment is generally unsuccessful and surgical reconstruction is required for optimal return to function. (10.1249/01.mss.0000089340.89660.eb)
  • [L4] Even in patients with chronic sagittal band incompetence, splintage is a reasonable first line of treatment before advising surgical intervention. (10.1177/1753193414530591)
  • [L4] An MCP extension orthosis for sagittal band injury led to mostly satisfactory results with 71% of patients achieving resolution of symptomatic tendon translocation, but manual labor, longer symptom duration, and grade III injury were associated with a higher likelihood of treatment failure. (10.1016/j.jhsa.2018.11.011)
  • [L4] Qualitative synthesis of available literature suggests that acute sagittal band injuries can be successfully treated by splinting the injured digit in neutral or hyperextension. (10.1177/1558944719895622)
  • [L4] Six cases in the same family suggest a possible familial predisposition to extensor tendon dislocation, potentially due to a genetic weakness in the sagittal bands or common environmental factors, though the condition is not proven to be truly genetic. (10.1177/1753193413489083)
  • [L4] Early diagnosis and repair of an acute, displaced, complete radial collateral ligament avulsion with injury to the sagittal band of the small finger MCP joint is associated with good outcome. (10.1007/s11552-008-9087-1)
  • [L4] The study supported the hypothesis that acute closed sagittal band injuries in non-rheumatoid patients can be successfully treated with conservative management using a sagittal band bridge, producing results comparable to surgical reconstruction without associated scar formation. (10.1197/j.jht.2006.11.007)
  • [L4] In a series of 180 patients with 1 to 3 lacerated extensor tendons studied over a 10-year interval, relative motion splinting permitted 98% recovery of flexion and 96% recovery of total active motion compared with the normal uninjured side. (10.1053/oa.2000.5972)
  • [L5] Knowledge of this anatomy supports repair of radial SB injuries to prevent tendon instability. (10.1016/j.jhsa.2008.01.039)
  • [L4] The operative approach under local anesthesia allows optimal placement of tension in the reconstruction at the time of surgery through the observation of flexion and extension actively performed by the patient on the operating table. (10.1016/s0749-0712(21)00064-0)
  • [L4] Severe flexion deformity of the MP joint from the combined forces of the extrinsic digital flexors and intrinsic muscles results in great tension in the retinacular ligaments of the extensor mechanism, in particular the SB, which can lead to attenuation of the SB and subsequent extensor tendon dislocation. (10.1054/jhsb.1998.0005)

See Also

References

[1] Functional anatomy of the sagittal bands and mechanisms of extensor tendon dislocation: a cadaveric study. Journal of Hand Surgery (European Volume). 2020. DOI: 10.1177/1753193420963257

[2] Disabling Hand Injuries in Boxing: Boxer's Knuckle and Traumatic Carpal Boss. Clinics in Sports Medicine. 2009. DOI: 10.1016/j.csm.2009.06.004

[3] The Association Between the Extent of Sagittal Band Disruption and Extensor Tendon Subluxation in Different Flexion Angles: A Cadaveric Study. The Journal of Hand Surgery. 2026. DOI: 10.1016/j.jhsa.2025.04.026

[4] Boxer's Knuckle in the Professional Athlete. The American Journal of Sports Medicine. 2000. DOI: 10.1177/03635465000280061701

[5] Anomalous Tendon to the Middle Finger for Sagittal Band Reconstruction: Report of 2 Cases. The Journal of Hand Surgery. 2012. DOI: 10.1016/j.jhsa.2012.05.029

[6] Closed Sagittal Band Injury of the Metacarpophalangeal Joint. Journal of the American Academy of Orthopaedic Surgeons. 2015. DOI: 10.5435/jaaos-d-13-00203

[7] Sagittal Band Injuries: A Review and Modification of the Classification System. The Journal of Hand Surgery. 2022. DOI: 10.1016/j.jhsa.2021.09.011

[8] Prognostic Factors for Conservatively Treated Sagittal Band Injuries of the Metacarpophalangeal Joint. The Journal of Hand Surgery. 2018. DOI: 10.1016/j.jhsa.2018.06.113

[9] Relationship Between Juncturae Tendinum and Sagittal Bands. Journal of Hand and Microsurgery. 2015. DOI: 10.1007/s12593-015-0172-8

[10] Traumatic Extensor Tendon Dislocation in a Boxer: A Case Study. Medicine & Science in Sports & Exercise. 2003. DOI: 10.1249/01.mss.0000089340.89660.eb

[11] Splintage in the treatment of sagittal band incompetence and extensor tendon subluxation. Journal of Hand Surgery (European Volume). 2014. DOI: 10.1177/1753193414530591

[12] Prognostic Factors for Nonsurgically Treated Sagittal Band Injuries of the Metacarpophalangeal Joint. The Journal of Hand Surgery. 2019. DOI: 10.1016/j.jhsa.2018.11.011

[13] Treatment of Sagittal Band Injuries and Extensor Tendon Subluxation: A Systematic Review. HAND. 2020. DOI: 10.1177/1558944719895622

[14] Extensor tendon dislocation of the hand: six cases in a family. Journal of Hand Surgery (European Volume). 2013. DOI: 10.1177/1753193413489083

[15] A Complete Radial Collateral Ligament Avulsion of the Small Finger Metacarpophalangeal Joint with Displacement through the Radial Sagittal Band. HAND. 2008. DOI: 10.1007/s11552-008-9087-1

[19] Closed Treatment of Nonrheumatoid Extensor Tendon Dislocations at the Metacarpal Joint. Journal of Hand Therapy. 2007. DOI: 10.1197/j.jht.2006.11.007

[20] Achieving immediate active motion by using relative motion splinting after long extensor repair and sagittal band ruptures with tendon subluxation. Operative Techniques in Plastic and Reconstructive Surgery. 2000. DOI: 10.1053/oa.2000.5972

[24] Functional Anatomy of the Thumb Sagittal Band. The Journal of Hand Surgery. 2008. DOI: 10.1016/j.jhsa.2008.01.039

[25] THE OPERATIVE REPAIR OF CHRONIC NONTRAUMATIC EXTENSOR TENDON SUBLUXATIONS IN THE HAND. Hand Clinics. 1995. DOI: 10.1016/s0749-0712(21)00064-0

[27] Extensor Tendon Dislocation in Cerebral Palsy. Journal of Hand Surgery. 1999. DOI: 10.1054/jhsb.1998.0005

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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.