Spontaneous rupture of extensor pollicis longus tendon with tophaceous gout infiltration

Introduction Spontaneous rupture of the extensor pollicis longus (EPL) tendon has been reported in the literature. Various mechanisms have been proposed to account for this problem, but gouty infiltration is a rare mechanism. Here we report a patient with a long-standing history of gout who presented with sudden loss of interphalangeal extension of the left thumb. Spontaneous rupture of the EPL tendon caused by gout was discovered. Materials and methods The successful treatment done involved surgical exploration and extensor indicis proprius tendon transfer. Postoperative thumb spica immobilization for 6 weeks was applied. Results Pathology disclosed urate crystals deposited within the ruptured EPL tendon. The functional recovery is satisfactory at the 1-year follow-up. Conclusion Spontaneous rupture of the EPL tendon caused by gout is rare. Successful treatment was done with surgical management. Life-long medical follow-up to prevent a repeated acute attack can lower the risk of a large amount of tophaceous gout infiltration in tendons and may possibly prevent acute spontaneous tendon rupture.