Instability, neuro.: A few thoughts. The knee or hip joint could be unstable from prior trauma or surgeries. It could also be a neurological problem that is causing weakness. The issue can arise anywhere from where the nerve connects to the affected muscle, through the spinal cord and up to the brain. Bottom line, i'd take this seriously and get it checked out. Best of luck.
Answered 2/6/2019
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A doctor has provided 1 answer
A doctor has provided 1 answer
A doctor has provided 1 answer
A doctor has provided 1 answer
A doctor has provided 1 answer
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