Ngón tay hình búa (mallet finger) Thông tin In-depth

This is the clinical evidence summary written for health professionals. It is technical, and it lists the research this page was built from. You do not need to read it to understand your treatment or to make a decision about it.

Overview

• Most mallet finger injuries can be managed non-surgically with splinting [5].
• Surgery is occasionally recommended for acute or chronic cases of mallet finger [5].
• Surgery is occasionally recommended for salvage of failed prior treatment in mallet finger cases [5].
• Both surgical and nonsurgical treatments of mallet finger injuries lead to excellent clinical outcomes [2].
• After a mallet-finger injury treated within two weeks by either internal or external splintage, few patients have significant persistent disability [7].
• Today most authorities splint only the distal joint for mallet finger deformities [9].
• There was insufficient evidence from comparisons tested within randomised controlled trials to establish the relative effectiveness of different custom-made or off-the-shelf finger splints used for treating mallet finger injury [10].
• The authors propose to treat all cases of mallet finger with a dorsal glued splint except for stage IV mallet finger [8].
• Stage IV mallet finger is treated with extra-articular pinning according to the proposed protocol in [8] [8].
• A simple splint is recommended as an alternative means of treating mallet finger [16].
• Delayed surgical management of bony mallet fingers demonstrated adequate functional outcome with minimal complications when compared with prior literature [1].
• Complication rates were low, suggesting that large-fragment mallet finger cases can be effectively managed conservatively [4].
• Absolute indications for surgical intervention for mallet fingers in the pediatric population remain unclear [3].
• The role of surgery for mallet fractures of the thumb remains unclear due to their uncommon nature and favorable radiographic findings [6].
• Surgery is generally indicated in the case of mallet fractures involving more than one-third of the articular surface [17].
• Surgery is generally indicated in all patients who develop volar subluxation of the distal phalanx [17].
• A significant advantage of surgical management even in complicated cases of mallet finger has yet to be clearly proven [17].

Anatomy & Pathophysiology

Mechanism of Injury

• Mallet finger most commonly involves a closed rupture of the terminal tendon with or without associated fracture of the distal phalanx [34].
• The usual mechanism of injury involves sudden passive flexion of the actively extended distal interphalangeal joint [21].
• Snagging the extending finger on a pants cuff, a bedsheet, or other object that suddenly flexes the extending DIP joint is a frequent cause of mallet finger [34].
• Less commonly, a forceful hyperextension injury of the DIP joint may result in a large fracture of the base of the distal phalanx involving one-third or more of the articular surface [34].
• Open mallet injuries are uncommon [34].
• The direction of force on the fingertip that results in a mallet fracture has yet to be determined [47].
• The precise mechanism of injury leading to different sizes of mallet fracture fragments might be difficult to delineate due to multiple variables, including tendon tension at the time of injury and the strain-rate-dependent mechanical properties of the affected bone and soft tissues [47].

Pathophysiology

• Mallet finger involves loss of continuity of the extensor tendon over the distal interphalangeal joint [14].
• Mallet finger reflects the loss of normal extensor force transmission via the terminal tendon insertion onto the distal phalanx [21].
• The unopposed flexor digitorum profundus pulls the distal joint into flexion [21].
• Mallet finger injuries may lead to an imbalance between flexion and extension forces more proximally in the digit [14].
• Disruption of the terminal tendon may be entirely confined to the tendon or may involve an avulsed fracture fragment from the dorsal lip of the distal phalanx proximal articular surface [21].
• Because the avulsed fragment includes the terminal tendon insertion, the clinical appearance of soft tissue and bony mallet fingers is similar [21].
• The distal joint rests in flexion, a posture that cannot be actively changed [21].
• Full passive extension of the distal interphalangeal joint is possible in mallet finger [21].
• Distal interphalangeal joint subluxation is expected with a mallet fracture fragment involving more than one-half of the joint surface [47].
• The distal interphalangeal joint has a remarkable ability to remodel [47].

Incidence and Demographics

• The most frequently involved digits are the small, ring, and middle fingers of the dominant hand, with a male predominance [34].
• Tendinous mallet fingers have been reported to occur from age 11 onward [34].
• In skeletally immature individuals, a transepiphyseal plate fracture may be seen [34].
• There may be a familial predisposition to mallet fingers [34].
• Elderly patients with osteoarthritis of the DIP joint may have “mallet” deformities that are not related to trauma [34].
• Individuals with hyperlax joints may have multiple pseudomallet swan neck postures that are unrelated to trauma [34].

Classification

• The Doyle classification system describes four types of mallet finger injuries [56].
• In the Doyle classification, Type IV represents mallet fractures and is further broken into three subtypes according to the size of articular involvement [56].
• The Wehbé and Schneider classification describes DIP joint subluxation and epiphyseal and physeal injuries [56].
• In the Wehbé and Schneider classification, articular injuries are subdivided into type A (less than one-third), type B (between one-third and two-thirds), and type C (larger than two-thirds of the joint) [56].
• The Doyle and Wehbé and Schneider classification schemes aid in standardizing injury patterns and guiding treatment algorithms [56].
• A 2023 review proposes a modification to the Doyle classification to make it more encompassing and less prone to interobserver error [26].
• The modified Mallet classification demonstrated strong to excellent agreement and interrater reliability across face-to-face, live tele-assessment, and video-based conditions [45].
• The modified Mallet classification is suggested to be appropriate for remote medical follow-up based on its reliability across assessment conditions [45].
• The interrater reliability of the Kellgren & Lawrence and OARSI classification systems for post-traumatic osteoarthritis in the distal interphalangeal joint after mallet finger fractures is considerably lower than initially assumed [44].

Clinical Presentation

• Mallet finger results in a flexion deformity of the distal finger joint [14].
• Mallet finger may lead to an imbalance between flexion and extension forces more proximally in the digit [14].
• Mallet injuries can be classified into four types based on skin integrity and the presence or absence of bony involvement [14].
• Mallet deformity accounts for a minority of sporting injuries [19].
• Mallet finger injuries are frequent in football [23].
• Mallet finger injuries are difficult to treat during the competitive season, often requiring delayed treatment or internal splinting [23].
• Early recognition of mallet finger injuries and referrals to a hand surgeon for treatment are crucial to avoid longterm disability [18].
• Approximately 50% of patients with a mallet fracture involving more than one-third of the articular surface of the distal phalanx do not progress to subluxation of the DIP joint [39].
• Fracture size and time to application of finger immobilizer are independent risk factors for the development of DIP joint subluxation in mallet fracture [39].

Investigations

• A radiograph should be obtained to determine whether a fracture is present [21].
• Radiographs should determine if the dorsal fragment is large and whether the distal phalanx is subluxed palmarward [21].

Treatment

Non-Operative Management

• Splinting of the distal interphalangeal joint for 6 to 8 weeks has yielded good results while minimizing morbidity in the majority of patients [14].
• Non-operative management of mallet fractures, regardless of fracture classification, joint congruence or pre-existing degenerate change in the DIP joint, is safe and yields predictably good outcomes in most patients [15].
• Conservative management of tendinous mallet finger injuries that have been neglected for 2 to 4 weeks can be treated as well as those injuries in patients presenting within the first 2 weeks of injury with low long-term complication rates [12].
• A mallet finger caused by avulsion of the extensor tendon from the distal phalanx can be satisfactorily treated by splinting 12 weeks after injury, as described for an acute injury [13].
• Prolonged splinting and splinting longer than 12 weeks may be successful, with the duration limited by the patient’s tolerance of the splinting [13].
• Supplemental night splinting does not improve the outcome of mallet finger in terms of extensor lag, disability, or satisfaction with treatment [24].
• There was insufficient evidence from comparisons tested within randomised controlled trials to establish the relative effectiveness of different, either custom-made or off-the-shelf, finger splints used for treating mallet finger injury [10].
• Excellent functional outcome can be achieved with splintage and avoidance of the causative sport while splinted [19].
• A hand therapist can treat type 1 mallet finger injuries as effectively as a surgeon [27].
• A hand therapist can treat mallet finger injuries of type 1 as effectively as a surgeon, with a method of immobilisation that offers practically no complications regarding skin condition [40].
• Large-fragment mallet finger cases can be effectively managed conservatively with low complication rates [4].
• The clinical efficacy of elastic taping for the treatment of mallet finger injuries remains to be tested vigorously [37].
• Conventional treatment protocols usually recommend 6 weeks of immobilization in a neutral or slightly flexed splint, followed by staged mobilization [33].
• Giddins (2022) suggested that only 3-4 weeks of immobilization for bony mallet injuries is sufficient, reflecting faster bone healing [33].
• A retrospective study examined outcomes of acute bony mallet injuries treated with 4 weeks of static immobilization in a splint, followed by graduated mobilization [33].

Operative Management

• Surgery is occasionally recommended for acute or chronic cases or for salvage of failed prior treatment [5].
• Surgical management may be considered for acute and chronic mallet lesions in patients who have failed nonsurgical treatment, are unable to work, or have specific functional needs [14].
• Surgery is generally indicated in the case of mallet fractures involving more than one-third of the articular surface as well as in all patients who develop volar subluxation of the distal phalanx [17].
• A significant advantage of surgical management even in complicated cases (fractures >1/3 articular surface or volar subluxation) has yet to be clearly proven [17].
• If the distal phalanx droops severely but passive extension in the distal interphalangeal joint is still satisfactory, surgery may be indicated depending on the patient’s needs [13].
• Scar overlapping suture for treating chronic tendinous mallet finger in children is safe and effective [41].
• A deepithelialised pedicled skin flap technique seems to be a new reliable alternative in the treatment of chronic mallet finger [46].

Surgical Techniques and Postoperative Care

• For secondary repair of chronic mallet finger, a small V-shaped or U-shaped incision is made convex distally, with the tip no closer than 5 mm proximal to the nail base on the dorsum of the finger [13].
• The surgical flap is developed in the plane between the tendon and the subcutaneous fat and elevated proximally to expose the extensor tendon with its intervening scar [13].
• The junction of the normal tendon with the scar is identified, and the tendon is severed transversely proximal to the joint, leaving the insertion of the tendon into bone [13].
• Sufficient scar or tendon is resected to allow closure of the gap with the finger in maximal extension [13].
• The joint is immobilized with a transarticular 0.045-inch Kirschner wire to support and protect the repair [13].
• The extensor tendon is repaired with 4-0 monofilament nylon or 4-0 monofilament wire as a pull-out roll stitch, with no additional sutures required [13].
• The skin is closed with interrupted 5-0 nylon or 4-0 nylon as a dermotondermal suture [13].
• The finger is maintained in extension with a compressive dressing and supported with a volar splint for post-operative comfort and to avoid reinjury [13].
• Sutures are removed at 10 to 14 days, and the distal joint is maintained in extension with the Kirschner wire protected by a small metal splint for 4 weeks [13].
• The Kirschner wire is removed after 4 to 6 weeks, and the repair is protected with a splint for 8 weeks [13].
• Normal activities are progressively resumed after the splinting period [13].

Complications

• The complication rate after operative treatment of mallet fracture was 41% [51].
• The high complication rate after operative treatment of mallet fracture is likely attributable to anatomical factors such as thin extensor tendon and poor blood supply [51].
• Delayed surgical management of bony mallet fingers demonstrated minimal complications [1].
• Conservative management of tendinous mallet finger injuries neglected for 2 to 4 weeks has low long-term complication rates [12].
• A surgical technique for acute combined tendon and bone mallet fingers reported no complications such as infection, nonunion, or nail deformity in the series [29].
• Complication rates were low in large-fragment mallet finger cases managed conservatively [4].

Recovery

• Most mallet finger injuries can be managed non-surgically with splinting, although surgery is occasionally recommended for acute or chronic cases or for salvage of failed prior treatment [5].
• The authors propose to treat all cases of mallet finger with a dorsal glued splint except for stage IV mallet finger, which they treat with extra-articular pinning [8].
• Most authorities splint only the distal joint for mallet finger deformities [9].
• Mallet finger injuries are frequent in football and difficult to treat during the competitive season, often requiring delayed treatment or internal splinting [23].

Key Evidence

• [L4] Delayed surgical management of bony mallet fingers demonstrated adequate functional outcome with minimal complications when compared with prior literature. [1] (10.1177/1558944719840749)
• [L4] Both surgical and nonsurgical treatments of mallet finger injuries lead to excellent clinical outcomes. [2] (10.1016/j.jhsa.2017.10.004)
• [L4] Absolute indications for surgical intervention for mallet fingers in this population remain unclear. [3] (10.1016/j.jhsa.2018.03.037)
• [L4] Complication rates were low, suggesting that large-fragment mallet finger cases can be effectively managed conservatively. [4] (10.1186/s12891-026-09787-w)
• [L5] Most mallet finger injuries can be managed non-surgically with splinting, although surgery is occasionally recommended for acute or chronic cases or for salvage of failed prior treatment. [5] (10.1007/s11552-014-9609-y)
• [L3] The role of surgery for mallet fractures of the thumb remains unclear due to their uncommon nature and favorable radiographic findings. [6] (10.1177/1558944716672192)
• [L1] After a mallet-finger injury treated within two weeks by either method few patients have significant persistent disability. [7] (10.1016/s0072-968x(82)80011-9)
• [L5] The authors propose to treat all cases of mallet finger with a dorsal glued splint except for stage IV mallet finger, which they treat with extra-articular pinning. [8] (10.5999/aps.2016.43.2.134)
• [L5] Today most authorities splint only the distal joint for mallet finger deformities. [9] (10.1016/s0749-0712(21)00059-7)
• [L1] There was insufficient evidence from comparisons tested within randomised controlled trials to establish the relative effectiveness of different, either custom-made or off-the-shelf, finger splints used for treating mallet finger injury. [10] (10.1002/14651858.cd004574.pub2)
• [L3] Conservative management of tendinous mallet finger injuries that have been neglected for 2 to 4 weeks can be treated as well as those injuries in patients presenting within the first 2 weeks of injury with low long-term complication rates. [12] (10.1016/j.jhsa.2014.06.140)
• [L5] [14] (10.5435/00124635-200509000-00007)
• [L3] Non-operative management of mallet fractures, regardless of fracture classification, joint congruence or pre-existing degenerate change in the DIP joint, is safe and yields predictably good outcomes in most patients. [15] (10.1177/1753193421992986)
• [L2] The study recommends this splint as an alternative means of treating mallet finger. [16] (10.1136/emj.10.3.244)
• [L4] Although surgery is generally indicated in the case of mallet fractures involving more than one-third of the articular surface as well as in all patients who develop volar subluxation of the distal phalanx, a significant advantage of surgical management even in those complicated cases has yet to be clearly proven. [17] (10.1177/1558944716642763)
• [L4] Early recognition of these injuries and referrals to a hand surgeon for treatment are crucial to avoid longterm disability. [18] (10.1016/j.hcl.2012.05.042)
• [L4] Mallet deformity accounts for a minority of sporting injuries, but excellent functional outcome can be achieved with splintage and avoidance of the causative sport while splinted. [19] (10.1054/jhsb.2000.0484)
• [L5] Mallet finger injuries are frequent in football and difficult to treat during the competitive season, often requiring delayed treatment or internal splinting. [23] (10.1016/j.hcl.2012.05.043)
• [L1] Supplemental night splinting does not improve the outcome of mallet finger in terms of extensor lag, disability, or satisfaction with treatment. [24] (10.1007/s11552-013-9600-z)
• [L4] [26] (10.1016/j.jhsa.2022.10.013)
• [L4] A hand therapist can treat type 1 mallet finger injuries as effectively as a surgeon. [27] (10.1197/j.jht.2008.04.002)
• [L4] The study describes a surgical technique for acute combined tendon and bone mallet fingers and reports good to excellent long-term results with no reported complications such as infection, nonunion, or nail deformity in the series. [29] (10.1016/j.jhsa.2014.11.011)
• [L4] [33] (10.1177/17531934251382017)
• [L4] Most fingers ended with a dorsal prominence, but this did not significantly affect function. [34] (10.2106/00004623-198466050-00003)
• [L4] The clinical efficacy of the proposed method of elastic taping for the treatment of mallet finger injuries remains to be tested vigorously. [37] (10.1016/j.jht.2014.02.005)
• [L2] Approximately 50% of patients with a mallet fracture involving more than one-third of the articular surface of the distal phalanx do not progress to subluxation of the DIP joint; fracture size and time to application of finger immobilizer are independent risk factors for the development of DIP joint subluxation in mallet fracture. [39] (10.1177/1753193414554556)
• [L4] A hand therapist can treat mallet finger injuries of type 1 as effectively as a surgeon, with a method of immobilisation that offers practically no complications regarding skin condition. [40] (10.1177/175899830501000103)
• [L4] Scar overlapping suture for treating chronic tendinous mallet finger in children is safe and effective. [41] (10.1186/s13018-019-1106-0)
• [L4] The interrater reliability of the Kellgren & Lawrence and OARSI classification systems for post-traumatic osteoarthritis in the distal interphalangeal joint after mallet finger fractures is considerably lower than initially assumed. [44] (10.1016/j.jhsa.2024.03.012)
• [L3] The modified Mallet classification demonstrated strong to excellent agreement and interrater reliability across face-to-face, live tele-assessment, and video-based conditions, suggesting it is appropriate for remote medical follow-up. [45] (10.1177/17531934231196118)
• [Paper] This method seems to be a new reliable alternative in the treatment of chronic mallet finger. [46] (10.1016/j.injury.2013.01.013)
• [L5] [47] (10.1016/j.jhsa.2008.04.014)
• [L4] The complication rate after operative treatment of mallet fracture was 41%, likely attributable to anatomical factors such as thin extensor tendon and poor blood supply. [51] (10.1054/jhsb.2000.0440)
• [L5] [56] (10.1177/1753193414554772)

References

[1] Delayed Extension Block Pinning in 27 Patients With Mallet Fracture. HAND. 2019. DOI: 10.1177/1558944719840749

[2] Surgical and Nonsurgical Management of Mallet Finger: A Systematic Review. The Journal of Hand Surgery. 2018. DOI: 10.1016/j.jhsa.2017.10.004

[3] Outcomes of Splinting in Pediatric Mallet Finger. The Journal of Hand Surgery. 2018. DOI: 10.1016/j.jhsa.2018.03.037

[4] Surgical versus conservative management of Doyle type 4c mallet finger: a comparative study. BMC Musculoskeletal Disorders. 2026. DOI: 10.1186/s12891-026-09787-w

[5] Current Concepts: Mallet Finger. HAND. 2014. DOI: 10.1007/s11552-014-9609-y

[6] Mallet Fractures of the Thumb Compared With Mallet Fractures of the Fingers. HAND. 2016. DOI: 10.1177/1558944716672192

[7] Mallet-Finger Injuries: A Prospective, Controlled Trial of Internal and External Splintage.. Hand. 1982. DOI: 10.1016/s0072-968x(82)80011-9

[8] Review of Acute Traumatic Closed Mallet Finger Injuries in Adults. Archives of Plastic Surgery. 2016. DOI: 10.5999/aps.2016.43.2.134

[9] EXTENSOR TENDON INJURIES AT THE DISTAL INTERPHALANGEAL JOINT. Hand Clinics. 1995. DOI: 10.1016/s0749-0712(21)00059-7

[10] Interventions for treating mallet finger injuries. Cochrane Database of Systematic Reviews. 2004. DOI: 10.1002/14651858.cd004574.pub2

[12] Soft-Tissue Mallet Injuries: A Comparison of Early and Delayed Treatment. The Journal of Hand Surgery. 2014. DOI: 10.1016/j.jhsa.2014.06.140

[13] Campbell S Operative Orthopaedics 4 Volume Set. RECONSTRUCTION OF FINGER FLEXORS: SINGLE-STAGE TENDON GRAFT > CHRONIC MALLET FINGER (SECONDARY REPAIR).

[14] Mallet Finger. Journal of the American Academy of Orthopaedic Surgeons. 2005. DOI: 10.5435/00124635-200509000-00007

[15] The non-operative management of bony mallet injuries. Journal of Hand Surgery (European Volume). 2021. DOI: 10.1177/1753193421992986

[16] The conservative treatment of mallet finger with a simple splint: a case report.. Emergency Medicine Journal. 1993. DOI: 10.1136/emj.10.3.244

[17] The Diagnosis and Management of Mallet Finger Injuries. HAND. 2016. DOI: 10.1177/1558944716642763

[18] Tendon Ruptures: Mallet, FDP and ECRB Tendon Ruptures Associated with Lunotriquetral Coalitions in Professional Basketball Players. Hand Clinics. 2012. DOI: 10.1016/j.hcl.2012.05.042

[19] Mallet Deformity in Sport. Journal of Hand Surgery. 2001. DOI: 10.1054/jhsb.2000.0484

[21] A Lange Medical Book Current Diagnosis Treatment In Orthopedics Fifth Edition. 9Hand Surgery > 3. Mallet Finger.

[23] Tendon Ruptures: Mallet, FDP in Football. Hand Clinics. 2012. DOI: 10.1016/j.hcl.2012.05.043

[24] A Prospective Randomized Controlled Trial Comparing Night Splinting with No Splinting after Treatment of Mallet Finger. HAND. 2014. DOI: 10.1007/s11552-013-9600-z

[26] Acute Mallet Finger Injuries—A Review. The Journal of Hand Surgery. 2023. DOI: 10.1016/j.jhsa.2022.10.013

[27] Hand Therapist-led Management of Mallet Finger. Journal of Hand Therapy. 2008. DOI: 10.1197/j.jht.2008.04.002

[29] Pullout Wire Fixation Together With Distal Interphalangeal Joint Kirschner Wire Stabilization for Acute Combined Tendon and Bone (Double Level) Mallet Finger Injury. The Journal of Hand Surgery. 2015. DOI: 10.1016/j.jhsa.2014.11.011

[33] Four-week splint with early mobilization protocol for the management of bony mallet injuries. Journal of Hand Surgery (European Volume). 2025. DOI: 10.1177/17531934251382017

[34] Mallet fractures.. The Journal of Bone & Joint Surgery. 1984. DOI: 10.2106/00004623-198466050-00003

[37] A novel way of treating mallet finger injuries. Journal of Hand Therapy. 2014. DOI: 10.1016/j.jht.2014.02.005

[39] The risk factors associated with subluxation of the distal interphalangeal joint in mallet fracture. Journal of Hand Surgery (European Volume). 2014. DOI: 10.1177/1753193414554556

[40] Hand Therapist-led Management of Mallet Finger. The British Journal of Hand Therapy. 2005. DOI: 10.1177/175899830501000103

[41] Scar overlapping suture for treating chronic tendinous mallet finger in children. Journal of Orthopaedic Surgery and Research. 2019. DOI: 10.1186/s13018-019-1106-0

[44] Rater Agreement of Post-Traumatic Osteoarthritis of the Distal Interphalangeal Joint 12 Years After a Mallet Finger Fracture. The Journal of Hand Surgery. 2024. DOI: 10.1016/j.jhsa.2024.03.012

[45] Interrater reliability of face-to-face, tele- and video-based assessments with the modified Mallet classification in brachial plexus birth injuries. Journal of Hand Surgery (European Volume). 2023. DOI: 10.1177/17531934231196118

[46] A new surgical treatment for mallet finger deformity: Deepithelialised pedicled skin flap technique. Injury. 2013. DOI: 10.1016/j.injury.2013.01.013

[47] A Biomechanical Study of Distal Interphalangeal Joint Subluxation After Mallet Fracture Injury. The Journal of Hand Surgery. 2008. DOI: 10.1016/j.jhsa.2008.04.014

[51] Complications of Operative Treatment for Mallet Fractures of the Distal Phalanx. Journal of Hand Surgery. 2001. DOI: 10.1054/jhsb.2000.0440

[56] Mallet fingers with bone avulsion and DIP joint subluxation. Journal of Hand Surgery (European Volume). 2014. DOI: 10.1177/1753193414554772