Fig. 2. The method of measuring the break point angle (BPA) when the knee extension angular velocity exceeds 30°/sec. (A) Starting position for BPA measurement based on the horizontal line passing through the lateral malleolus and the lateral epicondyle, the point at a 90° counterclockwise angle between the line connecting the lateral epicondyle and the greater trochanter of the femur. (B) The point where the BPA appear. Written informed consent was obtained from the subject for the publication of all clinical images.
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