[A girl with a deviated index finger].

Area of Science:

• Orthopedic Surgery
• Pediatric Traumatology
• Hand Surgery

Background:

• Metacarpophalangeal joint dislocations are common hand injuries.
• Kaplan's lesion is a specific type of complex dislocation involving volar plate interposition.
• Accurate diagnosis is crucial for appropriate management.

Observation:

• A 7-year-old girl presented with acute, severe index finger pain after a handstand injury.
• Physical examination revealed signs consistent with a dorsal dislocation of the metacarpophalangeal joint.
• Radiographic imaging confirmed an isolated dorsal dislocation of the metacarpophalangeal joint.

Findings:

• The injury was diagnosed as an isolated dorsal dislocation of the metacarpophalangeal joint, specifically a Kaplan's lesion.
• This type of lesion is characterized by the interposition of the volar plate.
• The complex nature of Kaplan's lesion often precludes closed reduction.

Implications:

• Surgical intervention is typically necessary for the successful reduction of Kaplan's lesions.
• A dorsal surgical approach is often preferred for managing these complex dislocations.
• Prompt surgical treatment can restore function and prevent long-term complications in pediatric hand injuries.