The lateral marginal vein drains the lateral border of the foot, ascending laterally to become the small saphenous vein posterior to the lateral malleolus. It connects the dorsal venous arch to the small saphenous system.
The lateral marginal vein is the anatomical origin of the small saphenous vein and is the access point for small saphenous vein cutdown procedures. In ankle fractures, lateral foot swelling involves this venous territory. It receives drainage from the fifth toe and lateral calcaneal veins.
Lateral foot venous congestion and haematoma from lateral marginal vein disruption in lateral ankle fractures contributing to significant lateral foot swelling that may delay surgical fixation.
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