Exterior carpi radialis longus tendinoplasty for thumb basal joint arthritis.

Thumb carpometacarpal arthritis has been successfully treated with a combination of trapezium excision, ligament reconstruction, and tendon interposition (most commonly with the flexor carpi radialis [FCR] tendon). We describe a technique using the extensor carpi radialis longus (ECRL) tendon and show, through dissection of 36 cadaver hands, the close relationship between this tendon and the intermetacarpal ligament. Of 16 patients (19 hands) managed with this technique, 95% were satisfied at a mean follow-up of 42 months. We conclude that ligament reconstruction and ECRL tendon interposition constitute a viable treatment option for carpometacarpal joint arthritis, especially when the FCR tendon is unavailable or its use is undesirable.