As a patient walks or runs or bikes or skis (or any straight line repetitive motion activity), following the heel contact, the knee should internally rotate slightly, and then the strong external rotators begin to correct and pull the knee strait. If the external hip rotators are too weak, this does not happen. As the body moves over the knee as you move forward, the knee is out of normal alignment and pain ensues. Here is another of the common exercises used to strengthen this important muscle.
Here the runner is maintaining good knee position
Here the runner's left knee is too internally rotated
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Thank you very much for leaving a comment. Due to my time restraints, some comments may not be answered.I will answer questions that I feel will help the community as a whole.. I can only answer medical questions in a general form. No specific answers can be given. Please consult a podiatrist, therapist, orthopedist, or sports medicine physician in your area for specific questions.