Background
Mallet finger, also called drop or baseball finger, is where the end of a finger cannot be actively straightened out due to injury of the extensor tendon mechanism. Treatment commonly involves splintage of the finger for six or more weeks. Less frequently, surgical fixation is used to correct the deformity.

Objectives
To examine the evidence for the relative effectiveness of different methods of treating mallet finger injuries.

Search methods
We searched the Cochrane Bone, Joint and Muscle Trauma Group Specialised Register (March 2008), the Cochrane Central Register of Controlled Trials (The Cochrane Library 2008, Issue 1), MEDLINE (1966 to March week 1 2008), EMBASE (1988 to 2008 week 11), other databases, reference lists of articles and various conference proceedings.

Selection criteria
Randomised or quasi-randomised clinical trials evaluating different interventions, including no intervention, for treating mallet finger injuries.

Data collection and analysis
Both authors independently performed study selection, quality assessment and data extraction. Study authors were contacted for additional information.

Main results
Four trials were included. These involved a total of 278, mainly adult, participants with 283 mallet finger injuries. All four trials were methodologically flawed, including inadequate outcome assessment.

Three trials compared different types of finger splints versus a standard Stack splint. One trial found a lower incidence of treatment failure in participants treated with a perforated custom-made splint. One trial found there were fewer complications in participants treated with a padded aluminium-alloy malleable finger splint; however, the incidence of treatment failure was similar in the two treatment groups. One trial evaluating the Abouna splint found a similar incidence of treatment failure in the two groups. However, the Abouna splint often needed replacing due to disintegration of its rubber cover and rusting of the exposed wires and was also less popular with participants.

The fourth trial found no statistically significant differences between participants whose mallet finger was treated with Kirschner wire fixation and those with a Pryor and Howard splint. Similar numbers had complications in the two groups.

Authors' conclusions
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. There was a useful reminder that splints used for prolonged immobilisation should be robust enough for everyday use, and of the central importance of patient adherence to instructions for splint use. There was insufficient evidence to determine when surgery is indicated.

Interventions for treating mallet finger injuries.

The extensor mechanism of the fingers, hand, wrist, and forearm is extremely intricate. Disruptions to the extensor system are common and can be associated with poor patient outcomes when not treated appropriately. Although extensor tendon injuries receive much less attention in the literature than flexor tendon injuries do, several recent studies have examined this topic. This article presents an overview of the treatment of extensor tendon injuries, with a focus on recent developments.

Extensor Tendon Injuries

Background: Mallet finger is a common injury. The aim of this review is to give an overview of the different treatment options of mallet injuries and their indications, outcomes, and potential complications. Methods: A literature-based study was conducted using the PubMed database comprising world literature from January of 1980 until January of 2010. The following search terms were used: "mallet" and "finger." Results: There are many variations in the design of splints; there are, however, only a few studies that compare the type of splints with one another. Splinting appears to be effective in uncomplicated and complicated cases. Equal results have been reported for early and delayed splinting therapy. To internally fixate a mallet finger, many different techniques have been reported; however, none of these studies examined their comparisons in a controlled setting. In chronic mallet injuries, a tenodermodesis followed by splinting or a tenotomy of the central slip is usually performed. If pain and impairment persist despite previous surgical corrective attempts, an arthrodesis of the distal interphalangeal joint should be performed. Conclusions: Uncomplicated cases of mallet injuries are best treated by splinting therapy; cases that do not react to splinting therapy are best treated by surgical interventions. Controversy remains about whether mallet injuries with a larger dislocated bone fragment are best treated by surgery or by external splinting. (Plast. Reconstr. Surg. 126: 1624, 2010.)

Treatment Options for Mallet Finger: A Review

Loss of the extensor mechanism at the distal interphalangeal (DIP) joint leads to mallet finger also known as baseball finger or drop finger. This can be secondary to tendon substance disruption or to a bony avulsion. Soft tissue mallet finger is the result of a rupture of the extensor tendon in Zone 1, and a bony mallet finger is the result of an avulsion of the extensor tendon from the distal phalanx with a small fragment of bone attached to the avulsed tendon. Mallet finger leads to an imbalance in the distribution of the extensor force between the proximal interphalangeal (PIP) and DIP joints. If left untreated, mallet finger leads to a swan neck deformity from PIP joint hyper extension and DIP joint flexion. Most mallet finger injuries can be managed non-surgically, but occasionally surgery is recommended for either an acute or a chronic mallet finger or for salvage of failed prior treatment.

/pdf/current-concepts-mallet-finger-3p1gsryzrd.pdf

Current Concepts: Mallet Finger

Purpose The current literature describes multiple surgical and nonsurgical techniques for the management of mallet finger injuries, and there is no consensus on the indications for surgical treatment. The objective of this study was to determine, through a literature review, if any conclusions can be drawn concerning the indications for surgery in mallet finger injuries; the treatment outcomes of surgical versus nonsurgical management; the most effective methods of surgical and nonsurgical treatment; and the most common treatment complications of mallet finger injuries. Methods A systematic review of multiple databases was performed. English language clinical studies evaluating therapeutic interventions for mallet fingers that reported objective, standardized outcome measures were included. Basic science studies, cadaveric studies, conference abstracts, level V evidence studies, studies lacking statistical data, and tendinous injuries other than mallet fingers were excluded. Salvage procedures and studies evaluating exclusively chronic lesions were also excluded. Results Forty-four studies that reported clinical outcomes for the treatment of mallet finger injuries, 22 evaluating surgical treatments and 17 studies investigating nonsurgical treatments were included. The average distal interphalangeal joint extensor lag was 5.7° after surgical treatment and 7.6° after nonsurgical treatment. Complication rates of surgical and nonsurgical interventions were comparable (14.5% and 12.8%, respectively). Five studies directly compared the outcomes of surgical with nonsurgical management, with mixed results and recommendations. Conclusions Both surgical and nonsurgical treatments of mallet finger injuries lead to excellent clinical outcomes. Insufficient evidence is available to determine when surgical intervention is indicated. Based on our literature review, it appears that these treatments are equivalent and should be individualized to the patient. Type of study/level of evidence Therapeutic IV.

Surgical and Nonsurgical Management of Mallet Finger: A Systematic Review.

A perforated mallet finger splint is described and the results of a controlled trial comparing its use with a conventional splint are presented. The perforated splint gives superior results by virtue of the fact that it does not require to be removed for purposes of hygiene and can thus produce a satisfactory result even in those patients who fail to grasp the technique of removal and replacement of the splint.

A comparative controlled trial of a new perforated splint and a traditional splint in the treatment of mallet finger.

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A comparative controlled trial of a new perforated splint and a traditional splint in the treatment of mallet finger.