Modified hemihamate arthroplasty technique for treatment of acute proximal interphalangeal joint fracture-dislocations.

We retrospectively reviewed 11 patients who underwent modified hemihamate arthroplasty for the treatment of comminuted dorsal fracture-dislocation of the proximal interphalangeal (PIP) joint. This technique was used to minimize the potential risk of complications at the recipient site by volarly oblique osteotomy in the coronal plane at graft harvesting and anatomical repair of the detached flexor sheath. The average joint involvement of the fracture was 58.4%, and the mean duration of follow-up was 38 months. The active range of motion of the distal interphalangeal, PIP, and metacarpophalangeal joint was 80.4, 85.4, and 91.8 degrees, respectively. The mean disabilities of the arm, shoulder, and hand score was 4.8, and all patients achieved bony union at final follow-up. One patient showed radiographic signs of graft absorption, but this did not limit their daily activities. The modified hemihamate arthroplasty technique is safe and reliable and reduces the risk of iatrogenic damage when used to treat comminuted dorsal fracture-dislocations of the PIP joint.