Abstract
A 46-year-old man injured his ring finger and developed a mallet deformity. Radiographs
showed a mallet finger fracture through an osteolytic lesion of the distal phalanx.
Magnetic resonance imaging showed low intensity on T1-weighted imaging and high intensity
on T2-weighted imaging, which suggested the clinical diagnosis of enchondroma. The
bone tumor was excised, and osteosynthesis was performed using Ishiguro's extension
block pinning, and a flexion block pin was added to prevent flexor tendon avulsion
fracture through the enchondroma, followed by an autologous iliac cancellous bone
graft. One year after surgery, the patient had no pain or extension lag of the affected
ring finger, and his quickDASH score was 0 points. Radiographs showed no recurrence
and minimal arthritic change of the distal interphalangeal joint. One-stage treatment
of a mallet finger fracture through an enchondroma using Ishiguro's method was effective.
Keywords
mallet finger - enchondroma - pathologic fracture - osteosynthesis
