Metacarpophalangeal Joint Dislocation Treatment & Management
- Author: Matthew Gammons, MD; Chief Editor: Craig C Young, MD more...
Finger metacarpophalangeal (MCP) joint collateral ligament sprains should not be overtreated. First-degree sprains may require a brief period of protection, usually consisting of buddy taping for 2-3 weeks. Second-degree sprains are immobilized in mid flexion for 3 weeks.
Finger MCP joint hyperextension injuries may be treated by gently flexing the proximal phalanx and immobilizing the MCP joint in 30° of flexion for 2-3 weeks. A dorsal extension-block splint protects the healing volar plate while allowing active flexion of the finger. Early protected motion minimizes postinjury stiffness.
Thumb MCP joint hyperextension injuries ("locked MCP joint") are immobilized in 20° MCP joint flexion for 3 weeks.
After closed reduction, a dorsal extension-block splint, including the wrist, is used for at least 3 weeks in MCP joint dorsal dislocations. Active motion within the splint is started during the first week. Following closed reduction, the thumb is immobilized in a forearm-based thumb spica splint or cast with the MCP joint in extension for 4-6 weeks in thumb MCP joint volar dislocations.
Thumb radial collateral ligament injuries may be treated in a forearm-based or hand-based thumb spica cast for 4 weeks.
After open reduction surgical repair, postoperative immobilization and therapy are similar to those that are recommended after closed reduction. In finger MCP joint collateral ligament injuries, surgical repair is indicated for gross instability (third-degree sprain) or a significantly displaced or rotated avulsion fracture.
MCP joint complex dorsal dislocations require open reduction in the operating room. This reduction may be accomplished with a palmar or dorsal approach. A dorsal longitudinal incision affords easy visualization of the interposed volar plate and avoids the digital neurovascular bundles that are more susceptible to injury with the palmar approach.
Volar MCP joint dislocations are extremely rare. The volar plate or dorsal capsule may be interposed into the joint, which usually requires open surgical reduction. Immobilization for 3-4 weeks in extension is recommended after successful reduction.
In thumb MCP joint dorsal dislocations, open reduction through a dorsal approach is indicated for failed closed reduction. A dorsal approach is also used for failed closed management of a locked thumb MCP joint injury. In thumb MCP joint volar dislocations, surgical repair should be considered for chronic dislocations or when postreduction radiographs demonstrate persistent volar subluxation of the MCP joint. In thumb radial collateral ligament injuries, significant laxity (>30°) or volar subluxation is an indication for surgical repair.
Immediate consultation with an orthopedic or hand surgeon is indicated for open or irreducible dislocations or when neurovascular compromise of the digit is present. After successful closed reduction, follow-up within 1 week should be arranged with an orthopedic or hand surgeon.
After the appropriate immobilization period, progressive hand therapy is initiated.
Finger MCP joint collateral ligament: Second- and third-degree sprains are protected with buddy taping for an additional 3 weeks.
Finger MCP joint hyperextension injuries: The injured digit is buddy taped to an uninjured finger for an additional 2-3 weeks.
MCP joint dislocations: Progressive motion and gradual weaning from the splint are performed over 3 weeks.
Thumb radial collateral ligament: Protected motion in flexion/extension and gradual weaning from the splint are performed over 2 weeks.
Significant collateral ligament laxity that interferes with hand function may require surgical reconstruction after an appropriate time period for normal healing has lapsed. Excessive joint contractures unresponsive to occupational therapy may require surgical release.
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