The iliopsoas can be implicated in the decrease in internal rotation especially if the motion is different in the neutral vs. the maximally extended position. To differentiate and compare simple hip rotation while in the neutral position, the examiner can and should perform internal rotation with the hip in a neutral (0 degrees) position which would centralize the piriformis influence more so than the Iliopsoas.

Dr. Halls Isometric Exercise Program to strengthen your shoulder muscles for rehab and injury prevetion.

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