Limited Wrist Arthrodesis for Scapholunate Advanced Collapse Wrist: Triangle Fixation for Four-Corner Fusion.

BACKGROUND: Limited wrist arthrodesis with scaphoid excision is a useful treatment for scapholunate advanced collapse (SLAC) of the wrist. Multiple Kirschner wires were originally used for internal fixation of the four carpal bones, however long-term cast immobilization, pin tract infection, and hardware removal are still problematic. We introduce and evaluate the clinical outcomes of an internal fixation technique; triangle fixation for four-corner fusion, using three headless screws, as an alternative to conventional multiple Kirschner wires for the treatment of SLAC wrist.

METHODS: Five male patients with SLAC wrist secondary to three scaphoid nonunions and two scapholunate dissociations were treated with four-corner fusion using triangle fixation with three Double-threaded Japan screws. The mean age was 59.5 years (35-79 years) and the mean follow-up period was 40 months. After surgery, short arm splints were applied for 3-4 weeks, and then range of motion exercises were initiated.

RESULTS: Wrist range of motion and grip strength both improved postoperatively. At the final follow-up evaluation, bone union was completely achieved and satisfactory pain relief was observed in all patients.

CONCLUSIONS: Compared with the conventional Kirschner wire technique, the present technique shortens the period of splint immobilization due to a strong compression force in a skewed position, does not require pin removal or cause pin tract infections, and provides satisfactory results.