Avulsion of the tibial tubercle is an uncommon physeal injury. Complic
ations from this fracture are infrequent. Adolescent boys developed co
mpartment syndrome after tibial tubercle avulsion. Injury to the soft
tissue surrounding the tibial tubercle avulsion may be more extensive
than is usually appreciated. The anatomy of the proximal tibia and the
tibial tubercle with nearby branches of the anterior tibial recurrent
artery suggest a predisposing factor for the development of compartme
nt syndrome. Compartment syndrome should be added to the list of possi
ble complications of tibial tubercle avulsion fractures.