avascular necrosis of the capitate

Trigger wrist

caused by avascular necrosis of the capitate: a case report. AP radiograph, CT, and MRI findings. a, b The preoperative radiographs showed collapse of the proximal portion of the capitate along with osteonecrosis. c, d The preoperative CT scans showed collapse of the proximal portion of the capitate along with osteonecrosis, a bone cyst in the proximal capitate, and a free body in the palmar proximal portion of the capitate. e A preoperative coronal T1-weighted MRI image showed low signal intensity at the proximal capitate. f A preoperative coronal STIR MRI image showed high signal intensity at the proximal capitate. g, h At the 2-year follow-up after surgery, the radiographs showed no further collapse of the capitate or progression of carpal instability