Figure 1.

Case 1: A 71-year-old woman hospitalized due to left little finger extension obstruction for more than 1 month. Diagnosis: old ulnar joint dislocation, ulnar impact syndrome, and spontaneous rupture of the left small extensor tendon. Distal ulnar articular cleft and TFCC articular cartilage repair was performed assisted by wrist arthroscopy. Sauve–Kapandji osteotomy was performed to treat ulnar joint dislocation, stabilize the ulnar joint; spontaneous fracture of the extensor tendon was repaired. (A–E) General view, X-ray, and MRI images of wrist before surgery; (F) intraoperative view of the broken tendon; (G) wrist arthroscopy revealed intra-articular synovial hyperplasia; (H, I): front and lateral X-ray of wrist immediately after the surgery; (J, K) front and lateral X-ray of wrist 6 months after surgery; (L, M) patient's wrist and finger activity, 6 months after surgery.