Effects of fatigue on hip joint control in runners with ITBS
Iliotibial band syndrome (ITBS) is the second most common running injury. The pain is usually located at the lateral knee. Kinematic alterations that have been mentioned in relation to ITBS are increased adduction of the hip and internal rotation in the knee during running. Previous studies have also mentioned that there is possibly a lack of coordination in the hip and knee, which can result in kinematic changes in the lower extremity. The purpose of the current study was to determine the effects of fatigue on hip joint kinematics, kinetics and joint coupling patterns in runners with ITBS as compared with healthy controls.
Runners with ITBS showed an increase in hip adduction angles during the stance phase. It has been suggested that runners with ITBS alter their gait in such a manner that at the peak stance phase hip adduction angle decreases. A difference of 18,5% was measured between the ITBS group and healthy controls. No difference was found in abduction or internal rotation of the hip.
Another factor that has been suggested as contributor to ITBS is hip abductor weakness: fatigue of the external rotators and abductors may alter running kinematics. However it isn’t very likely that abductor weakness is the cause of ITBS, as fatigue of this muscle would not only be present in the form of increased hip adduction, but also in increased hip internal rotation angles during stance. This was not seen during this study.
A limitation of this study is that the runners were asked to run a fixed speed during a relative short distance, which could have automatically altered their running mechanics.
> From: Brown et al., 39 Clin Biomech (2017) 84-90. All rights reserved to Elsevier Ltd. . Click here for the online summary.