A cemented surface replacement prosthesis in the basal thumb joint

The purpose of this study was to evaluate a cemented prosthesis (Avanta SR TMC prosthesis; Avanta Orthopaedics, San Diego, CA) of the basal thumb joint on the outcomes of range of motion, strength, pain, function, and loosening.

Between July 2004 and December 2007, a total of 15 prostheses in 13 patients were implanted, with an average follow-up period of 36 months (range, 21-63 mo). Before and during the follow-up, the following scores were recorded: Kapandji-score (range of opposition), strength (hand dynamometer and pinch meter), pain (sequential occupational dexterity assessment [SODA], and Michigan Hand Outcomes Questionnaire [MHQ]) and function (9-hole peg test, SODA and MHQ). Radiographs taken before and after surgery were reviewed.

The measurements of range of opposition and strength did not show any significant postoperative improvement. Pain during activities (SODA) decreased significantly, and the function with both hands (SODA and MHQ) improved significantly after surgery. The review of pre- and postoperative radiographs did not show any signs of implant loosening after surgery. One failure and one nerve injury occurred.

In this group of patients, the Avanta SR TMC prosthesis provided statistically significant improvements in function with both hands and in pain during activity, but no significant change in range of motion, strength, or in function of the operated hand used alone. Prosthesis loosening was not detected.