The four EDL tendon slips pass beneath the superior and inferior extensor retinacula and diverge to the lateral four toes, each expanding over the toe dorsum as an extensor hood inserting into the middle and distal phalanges via central slip and lateral bands. The distal tendons are the functional components for lesser toe extension.
EDL tendon ruptures at the dorsal foot level are uncommon but occur in penetrating foot injuries and diabetes. The tendons are repaired using Kessler core sutures accessible through dorsal foot incisions. Hammer toe deformity involves imbalance of EDL versus intrinsic muscles at the MTP joint, producing MTP hyperextension from EDL dominance. Foot drop produces EDL tendon subluxation as the tendon bows-strings with toe extension.
Laceration or rupture of one or more EDL distal tendon slips producing toe drop — inability to extend the affected lesser toe — repaired by primary suture or tendon transfer for chronic injuries.
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