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Few cases in which open reduction and internal fixation was performed for displaced pisiform fractures have been reported. We present a new surgical technique for the treatment of depressed intra-articular pisiform fractures. First, the depressed fragment was reduced by pushing the bone tamp. Then, the fracture void resulting from the reduction of the depressed fragment was filled with a shaped hydroxyapatite block. Finally, the fragments were sutured using braided polyblend polyethylene sutures. The postoperative radiography could achieve a well-reduced articular facet, and this procedure had a good clinical outcome.