Early Outcomes of FCR Tendon Suspension Arthroplasty in Basal Thumb Arthritis: The Effect of Scaphometacarpal Distance Collapse on DASH Scores

Objective: To review the early outcome of flexor carpi radialis (FCR) tendon suspension arthroplasty for basal thumb arthritis (BTA) with specific analysis of the relationship between scaphometacarpal (SMC) distance and functional outcome, as measured by Disabilities of the Arm, Shoulder, and Hand (DASH) scores. Methods: Seven patients with BTA treated with FCR tendon suspension arthroplasty were recruited for this study. Follow-up was available for all patients with a mean period of 6 months . The SMC distance was measured preoperatively and postoperatively. DASH scores were documented at the 6-month follow-up. The relationship between SMC distance and DASH scores was evaluated, and statistical significance was accepted as p < 0.05. Results: The mean preoperative SMC distance was 12.8 mm (range: 10–15.4 mm), which decreased to 5.8 mm (range: 4.2–7.6 mm) at the six-month postoperative follow-up.The mean DASH score was 26.2. Statistical analyses showed no significant association between SMC distance and DASH scores. No postoperative complications were observed. Among the seven patients who underwent surgery, six reported being satisfied with the outcome, while one patient was dissatisfied. In conclusion, the decrease in SMC distance after FCR tendon suspension arthroplasty does not correlate significantly with early functional outcomes, as indicated by DASH scores. This may be interpreted that radiographic changes in SMC distance do not affect short-term clinical results. Further studies with larger patient groups and extended follow-up are warranted.