Abstract
Silastic Trapezium Implant Arthroplasty (STIA) for osteoarthritis of the trapezometacarpal joint is adapted from the Swanson prosthesis arthroplasty. We reviewed the result of this method, mainly in cases with mid to long-term follow-up.From 1983 to 1996, 8 thumbs in 8 patients (1 male, 7 female) underwent treatment using the Swanson method. Patients ranged in age from 48 to 76 years (mean 63.3 years). Patients were classified according to the Eaton classification as follows; stage II in 4 thumbs, stage III in 4 thumbs.Six patients complained of no pain, and 2 patients felt slight pain on motion. The average grip strength was 15.6kg (83.9% of unaffecte side). The average pinch strength was 11.9kg (82.6% of unaffected side). Postoperative roentgennogram showed no evidence of sinking or subluxation and rupture of the implant.
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