This syndrome is usually developed by people who suddenly increase their level of activity, such as runners who increase their mileage. Other risk factors for ITBS include gait abnormalities such as overpronation, leg length discrepancies, or bow-leggedness.
This syndrome typically arises from an abrupt rise in physical exertion, such as runners increasing their mileage.  Other contributing factors to ITBS include abnormal walking patterns like overpronation, uneven leg lengths, and bow legs.