Thumb Carpometacarpal Arthroplasty with Ligament Reconstruction and Interposition Costochondral Arthroplasty

Abstract

Background Thumb arthritis at the carpometacarpal (CMC) joint is one of the most common sites of arthritis, especially in women. Thumb arthroplasty is an effective method of relieving pain and improving function.

Materials and Methods Qualitative and quantitative outcomes were assessed clinically and radiographically in 58 patients (66 thumbs) with thumb basal joint arthritis limited to the trapeziometacarpal joint, treated with hemiresection arthroplasty of the trapezium, flexor carpi radialis (FCR) ligament reconstruction, and allograft costochondral interposition graft.

Description of Technique The thumb CMC joint arthroplasty is performed using an FCR tendon for ligament reconstruction combined with removal of the distal half of the trapezium, which is replaced with a life preserver–shaped spacer that is carved out of allograft cartilage.

Results Results of the validated Disability of Arm, Shoulder, and Hand (DASH) questionnaire at a mean follow-up time of 56 months (range, 24–103 months) revealed that 90% of the patients had a high level of function with minimal symptoms. Important improvements in web space with increased palmar and radial abduction and grip and pinch strength measurements were observed. The trapeziometacarpal space had decreased 21% after surgery, while trapeziometacarpal subluxation was 14% compared with 21% before surgery. There was an inverse correlation between the loss of trapezial height and subluxation and clinical outcome.

Conclusions The results of this study demonstrate that, although the preoperative trapezial height was not maintained, the reconstructed thumbs remained stable, with little subluxation and improved clinical outcomes.

Level of Evidence IV, retrospective case series

Keywords

thumb arthritis - thumb arthroplasty - CMC OA - Hemitrapeziectomy - hand arthritis

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