Irreducible Metacarpal Neck Fracture due to Interposition of the Extensor Tendons.

A 15-year-old male presented with multiple right-hand fractures, including a severely angulated small finger metacarpal neck fracture. Multiple closed attempts failed, and open reduction was performed. At surgery, the extensor tendon was found to be interposed within the fracture, thereby preventing closed reduction. The tendon was extricated from the fracture site, adequate reduction was obtained, and the fracture was stabilized using K-wires. The fracture united well, with good return of motion and strength. Extensor tendon interposition is a rare scenario associated with metacarpal neck fractures and should be suspected when there is complete loss of contact between the fracture ends and multiple attempts at closed reduction have failed.