The authors present a review of Swanson's trapezium implants used in the surgical treatment of arthrosis of the basal joint of the thumb. 32 patients operated between 1970 and 1979 were invited to consultation, and 22 were examined again after an average period of 9.8 years. The clinical findings seemed to be good, with satisfactory subjective results in 95 per cent of all cases. On the contrary, radiographs showed 50 per cent of luxations and subluxations, and implant wear in 70 per cent of cases, increasing with time. In 39 per cent of cases, intracarpal cavities secondary to an adverse reaction to the silicon implant were noted. However, no second operation was needed. In spite of the good clinical results, the authors reserve Swanson's implants, considering the radiological findings, to subjects older than 65 years, because of the risks of long-term intolerance. Trapezectomy seems to be preferable in younger patients.