Wheeless' Textbook of Orthopaedics - compartment syndrome is uncommon in thigh because of large-volume that the thigh requires to cause a pathological increase in interstitial pressure; - fascial compartments of thigh blend anatomically w/ muscles of hip,potentially allowing extravasation of blood outside compartment; - compartment syndrome may be caused by a decrease in compartmental volume, increase in compartmental contents, or externally pressure;