The most important complications of trapeziometacarpal arthroplasty are dislocation and component loosening. Incorrect cup position is often a contributing factor. Intra-operative guidelines to optimize cup orientation have recently been described. We evaluated the functional and radiological outcome of 50 Maïa® trapeziometacarpal prostheses that were implanted according to these guidelines. The minimum follow-up was 56 months. No constrained cups were used. Functional outcome was good to excellent. No spontaneous dislocations occurred. No radiological signs of loosening were observed. There was one case of premature wear. The survival rate was 96% (95% confidence interval 85 to 99%) at a mean of 65 months, with two prosthesie removed for posttraumatic trapezial fractures. This study shows that correct implant position can lead to reliable medium-term results after trapeziometacarpal joint arthroplasty.
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