Proximal interphalangeal joint arthroplasty with the Tactys® prosthesis: Clinical and radiological outcomes at a mean 3.1 years' follow-up.

Preliminary results with the Tactys® modular gliding prosthesis for proximal interphalangeal joint (PIPJ) replacement were encouraging, with notable improvement in clinical and functional scores at 1 and 2 years' follow-up. However, a recent study found a trend for deterioration over time. We wanted to check this by analyzing medium-term outcomes. Sixty-four arthroplasties were performed in 48 patients in single facility between January 2015 and January 2020. Clinical, functional, and radiographic outcomes were analyzed at short- and medium-term follow-up for 15 of these arthroplasties. Mean follow-up of the 48 patients was 3.1 years. Pain significantly decreased on the numeric rating scale (p < 0.01) and the functional QuickDASH score improved from 67.3 to 55.9 (p < 0.01). Grip and pinch strengths were lower in the operated than in the contralateral hand (p = 0.04 and p = 0.6, respectively). PIPJ active range of motion (ROM) in flexion/extension improved from 44° to 49.4° (p = 0.17). 70% of the 48 patients were satisfied. Fifteen arthroplasties were analyzed at 17 and 61 months' follow-up. Pain relief continued. ROM decreased from 57° to 46° (p < 0.05) and the functional QuickDASH score deteriorated from 25.8 to 54.7 (p < 0.01). Both grip and pinch strength increased, with a significant difference in pinch (p = 0.003). The main complication was swan-neck deformity (46%), with a mean 11 months' onset. Our results confirmed the deterioration trend observed over time in the functional results of the Tactys® prosthesis despite, good patient satisfaction. LEVEL OF EVIDENCE: 4.