Clinical and radiological outcomes of 40 cases of SLAC and SNAC wrist treated by four-corner arthrodesis with locking plate.

The treatment of scapholunate advanced collapse (SLAC) and scaphoid nonunion advanced collapse (SNAC) wrist varies. No clear consensus exists on surgical indications. Scaphoid excision and four-corner arthrodesis with locking plate is one of preferred treatments for these lesions. The purpose of this study was to assess the clinical and radiological outcomes of locking plates for treating SNAC and SLAC wrist after a mean follow-up of 5 years and to compare these outcomes with the results reported in the literature. A retrospective study was conducted in two hospitals, involving 40 patients who underwent scaphoid excision and four-corner arthrodesis with locking plate between January 2006 and September 2016. All patients were reviewed as outpatients with clinical and radiographic measurements. At the last follow-up, the mean pain level on visual analog scale (VAS) was 2.5/10 [0-7] (SD: 1.7). Patients had a mean flexion of 46% and a mean extension of 46% compared to the contralateral side. An 18% gain was observed in grip strength. The mean postoperative QuickDASH score was 30 [0-57] (SD: 15.3). Seventy percent of patients were satisfied with the operation. Complete (all four joint interfaces) joint space fusion was achieved in 55% of patients. Only one patient (2.5%) had no joint fusion. The joint between the lunate and the capitate was fused in 38 patients (95%). Nine patients suffered complications; eight of them required surgical revision (20%). Four-corner arthrodesis with locking plate is a valuable surgical technique for treating SLAC and SNAC wrist because it preserve satisfactory range of motion and grip strength (64% compared to the non-operated side), maintains the height of the carpus and prevents the premature appearance of radiocarpal osteoarthritis, as long as the technical challenges of this procedure are mastered.

Arthroscopy-assisted treatment of scaphoid and lunate cysts: Clinical evaluation of 7 cases.

Intraosseous cysts of the carpus are relatively common benign tumors. They are often discovered by chance and can cause wrist pain thereby requiring appropriate management. While conventional open surgical treatment leads to good results, it has certain disadvantages, the main one being postoperative stiffness. Arthroscopic treatment has been proposed as an alternative for lunate cysts. The present study consisted in evaluating the feasibility and outcomes of arthroscopic treatment for lunate and scaphoid cysts. The main objective was to evaluate the postoperative clinical outcomes at 3 and 18 months. The secondary objective was to evaluate the integration of a cancellous bone graft. We conducted a retrospective study of eight patients who underwent surgery between April 2010 and October 2016. Of these, four had a lunate cyst and four had a scaphoid cyst; all cysts had a dorsal operculum. Patients had disabling wrist pain that did not respond to conservative treatment. The diagnosis was confirmed by radiography and either a CT scan or an MRI. Curettage and cancellous grafts were performed under arthroscopic control. The technique was carried out successfully in all cases. One patient was lost to follow-up. At 18 months, postoperative pain was rated at 1.28 on a visual analog scale. The grip strength (measured with a Jamar dynanometer) was 77% when compared to the contralateral side. There was an improvement in joint range of motion, with an average wrist flexion of 67.5° compared to 48.3° preoperatively and an average wrist extension of 71.5° compared to 47.6° preoperatively. The Patient-Rated Wrist Evaluation (PRWE) score decreased from 69.7 to 12.7, which was a significant decrease. A good integration of the cancellous graft was confirmed at 6 months in all cases by CT scan or MRI. Curettage with a cancellous graft of lunate and scaphoid cysts under arthroscopic control is a technique that allows surgeons to obtain satisfactory clinical results with good integration of the graft.