Palmaris longus tenodesis for oblique retinacular ligament reconstruction for swan-neck deformity, called the spiral oblique retinacular ligament. Pathologic condition of swan-neck deformity involves hyperextension of proximal interphalangeal joint with extensor lag at distal joint, combined with laxity of volar plate. Palmaris longus can be used to provide tenodesis to correct imbalance at both joints. SEE TECHNIQUE 66.26.