Thank you for your query at AskTheDoctor.com
I understand your concern.
If it has been a chronic problem, it is better to get an x-ray done of both the knees to check for any joint deformity. Sometimes if the calcium values are low, the bone resorption can cause the joints to become weak, and hence weakness at the joint level as well as falling down becomes common.
So, kindly get yourself investigated for the same.
Hope this was helpful,
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