The human body contains forty six osteofacial compartments. Within these compartments are muscles, veins, arteries and nerves surrounded by tissue called fascia which is dense and unyielding.
The most common orthopedic setting for compartment syndrome is the closed tibia fracture for which the incidence is 3% to 17% 1. This discussion will be limited to compartment syndrome following tibia fractures.
The foreleg consists of four compartments known as the anterior, lateral, posterior and deep posterior compartments 2. Located within the anterior compartment are the motors for dorsiflexion of the foot and toes; the tibialis anterior, extensor halluces longus and extensor digitorum longus muscles. These muscles are innervated by the deep peroneal nerve which enters the anterior compartment after winding around the outer surface of the neck of the fibula. Located within the posterior compartment are the gastrocnemius, soleus and plantaris muscles which plantar flex the foot and flex the leg. These muscles are invervated by the tibia] nerve. The deep posterior compartment contains the flexor halluces longus, flexor digitorum longus, tibialis posterior and. popliteus muscles. These muscles plantar flex the foot (tibialis posterior), flex the leg and rotate it medially (popliteus), flex the big toe and flex and supinate the foot (flexor halluces longus) and flex the four small toes and plantar flex and supinate the foot (flexor digitorum longus). These muscles are innervated by the tibial nerve. Finally, the lateral compartment contains the peroneus longus muscle and the peroneus brevis muscle which pronate and flex the foot. These muscles are supplied by the superficial peroneal nerve 3.
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