During a squat, your client's knees buckle inward as she ascends. This problem is most likely due to

Knee vulgus

Explanation:

In simple words, Knee Vulgus is a condition in which the knee caves inwards towards the body's midline. Throughout a squat, knee vulgus is a typical incorrect movement sequence.  The feeble hip captors are frequently overpowered by the powerful hip adductor muscles (placed in the inner thigh) (gluteus medius and gluteus minimus).

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