Flexor Carpi Radialis to Palmaris Longus Tendon Transfer for Spontaneous Rupture of the Flexor Carpi Radialis Tendon-A Review of an Uncommon Finding and Surgical Technique for Operative Correction.

Spontaneous ruptures of the flexor carpi radialis tendon (FCR) are rare and associated with systemic inflammatory diseases, localized tendinopathy related to scaphotrapezial-trapezoidal arthritis, or chronic immunosuppression from corticosteroids. While most cases do not require operative intervention, some patients develop weakness, impaired range of motion, and persistent pain. Previously reported surgical options include synovectomy, tendon stump resection, and osteophyte removal. We describe a surgical technique for patients with persistent symptomatology following FCR rupture in which the FCR is transposed end-to-side to the palmaris longus tendon. Three cases using this technique are presented with follow-up of 4-9 months that were collected at Lenox Hill Hospital. All three patients did well regarding specific outcome measures: grip strength, range of motion, and functional activity. FCR transfer to palmaris is an alternative to other surgical options for the spontaneous rupture of the FCR tendon in patients who remain symptomatic despite a course of non-operative therapy.