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Peak hip adduction angle is frequently associated with running related injuries. The purpose of this study was to identify how clinical assessment measures interact to determine the presence of high or low peak hip adduction angles during running. A mixed sex sample of runners (n=125) comprising both injured and healthy controls were assessed for hip abduction strength and range of movement of the hip and ankle. Each runner then ran on a treadmill whilst 3D kinematic data was recorded, with peak hip adduction angles isolated from the data. All interest variables were analysed using a classification and regression tree procedure. This produced a model which was able to classify runners with either high or low peak hip adduction angles with an accuracy of 83.2%. The contribution of hip abductor strength to peak hip adduction angles was influenced by step rate, ankle dorsiflexion range of movement and injury status. This adds to our understanding of the relationship between hip strength and peak hip adduction.