Risk of Total Wrist Arthrodesis or Reoperation Following 4-Corner Arthrodesis or Proximal Row Carpectomy for Stage-II SLAC/SNAC Arthritis A Propensity Score Analysis of 502 Wrists

Background: For stage-II scapholunate advanced collapse (SLAC) and scaphoid nonunion advanced collapse (SNAC) patterns of wrist arthritis, the optimal method of surgical treatment remains unclear. Previous literature has demonstrated similar clinical outcomes between proximal row carpectomy (PRC) and 4-corner arthrodesis (FCA), making the risk of reoperation a focus of particular interest. In the present study, the primary null hypothesis was that there would be no difference in the rate of conversion to total wrist arthrodesis between PRC and FCA. Additionally, we hypothesized that the rate of secondary surgical procedures would be similar between the 2 procedures. Methods: The national Veterans Health Administration Corporate Data Warehouse was utilized to identify 2,449 patients who underwent either PRC or FCA between 1992 and 2016. With use of operative reports to identify the arthritis pattern, only cases of stage-II SLAC/SNAC were included. All complications and subsequent surgical procedures were confirmed by manual chart review. Propensity score analyses with matching weights were utilized to balance the PRC and FCA cohorts. The rates of conversion to wrist arthrodesis and secondary surgical procedures were calculated. Results: Of the 1,168 patients with stage-II SLAC/SNAC arthritis, 933 wrists underwent PRC and 257 wrists underwent FCA. Ten-year survival free of total wrist arthrodesis in the matching PRC (251 procedures) and FCA (251 procedures) cohorts was 94.3% (95% confidence interval [CI], 92.3% to 96.3%) and 94.1% (95% CI, 90.8% to 97.4%), respectively. Survival free of a secondary surgical procedure other than wrist arthrodesis was 99.7% (95% CI, 99.3% to 100.0%) for PRC and 83.5% (95% CI, 78.2% to 88.8%) for FCA. Conclusions: PRC and FCA demonstrated similarly low rates of conversion to total wrist arthrodesis. In contrast, the rate of secondary surgical procedures following FCA was significantly higher compared with PRC. Given the historically similar clinical outcomes between PRC and FCA, the results of the present study show that PRC may be a preferable treatment for stage-II SLAC/SNAC wrist arthritis.