Usually this is a tracking issue from the quads - either your VMO isn’t firing properly and not supporting your medial knee. Or more commonly the lateral vastus lateralis has become tight pulling the knee cap out. The latter can be fixed with lots of foam rolling/massage of that lateral quad muscle to loosen it up - there are loads of trigger points about 3 inches above the knee in that muscle. VMO problems are more difficult to fix as the muscle only fires for a small part of the knee movement range.
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