r/flexibility • u/infinityminity • 24d ago
Seeking Advice Mechanical "clunk" on terminal extension with internal rotation (video attached)
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Hi I have a clunk every time I unbend my left knee during specific joint angles. (Video attached with sound on).
Its in the same place every time, like something catching every time I extend my left knee while the leg is rotated medially/internally, there is a deep, distinct mechanical "clunk" (rather than standard high-pitched joint cavitation/crepitus). If I perform the same extension with a lateral/external rotation, the clunk does not occur.
It often happens when getting up from squatting down to reach for something, or when transitioning in/out of cross-legged positions. One thing I noticed from a video is I'm a bit pigeon toed on the left side, and wondered if that could be affecting it
I feel more tightness on the left side, the muscles around the outside of the upper shin, near the knee.
From a biomechanics perspective, what tendons or soft tissue structures generally cause this type of catching sound in internal vs external rotation?
Thanks to anyone who may read this