Musculus extensor digitorum lateralis
Extends the hind digit and assists in hock flexion. Its tendon passes under the lateral malleolus of the tibia.
Origin: Lateral collateral ligament of the stifle and proximal fibula
Insertion: Dorsal surface of the proximal phalanx (P1) of the hind limb
Action: Extends the hind digit; assists hock flexion
Innervation: Peroneal (fibular) nerve (L5-S2)
The common peroneal nerve is vulnerable where it crosses the lateral surface of the stifle. Commonly injured from lateral recumbency on hard surfaces (anesthesia, prolonged casting).
The common peroneal nerve is vulnerable where it crosses the lateral surface of the stifle. Commonly injured from lateral recumbency on hard surfaces (anesthesia, prolonged casting). Signs include: Knuckling of the fetlock; dorsal hoof dragging; inability to flex the hock and extend the digit; characteristic 'goose-stepping' gait when recovering; Knuckling of the hind fetlock; inability to extend the digit; toe dragging; dorsal hoof wear; may occur after surgery from positioning.; Inability to flex the hock actively; knuckling; often from bandage or cast pressure on the lateral stifle/gaskin area.
See the Lateral Digital Extensor (Hind) on our interactive 3D horse model. Open 3D Model