Hemiresection Capsuloretinacular Interposition Arthroplasty for Distal Radioulnar Joint Osteoarthritis.

Hemiresection interposition arthroplasty (HIA), which can preserve triangular fibrocartilage complex (TFCC) and distal radioulnar joint (DRUJ) function, is one of the surgical options for DRUJ osteoarthritis.  An arcuate vertical incision of approximately 8 cm was made, and the flap, including both the extensor retinaculum and dorsal DRUJ capsule, was wrapped around the resected ulnar head. In cases where the TFCC was torn, repair or reconstruction was also performed.  Twenty-one wrists in 20 patients with DRUJ osteoarthritis were treated. Patients with rheumatoid arthritis were excluded. Preoperative ulnar variance value averaged 1.8 mm. The average length of follow-up period was 2 years and 10 months. Functional outcomes were evaluated by visual analog scale (VAS) for wrist pain, Disabilities of the Arm, Shoulder, and Hand, Patient-Rated Wrist Evaluation (PRWE), range of wrist and forearm motion (palmar-dorsal flexion and pronation-supination), and grip strength (% of the contralateral value). X-ray parameters (width of the ulnar head, DRUJ distance) were assessed.  The postoperative grip strength and range of wrist and forearm motion improved significantly, and VAS for pain and PRWE improved larger than minimum clinical important difference. The DRUJ gap distance was maintained sufficiently in average value of 5.3 mm at the final follow-up.  The current modified HIA procedure combined with TFCC repair or reconstruction provides feasible short-term functional outcomes for treatment of patients with DRUJ osteoarthritis regardless of preoperative ulnar variance.