Pain at back side of left knee

Patient : Pain at back side of knee. Get pain while trying to open legs after keeping it folded for sometime. Issue specially is in left leg. X-ray shows all clear but blood test has shown low Vitamin D (11 ug/ml).Thus currently under treatment for Calcium tablet and vitamin D supplement. Doctor also has provided a gel followed by exercise. I am under treatment from last 1 week. How long it will take to be totally cure? Is there anything else that I should do? Note: I have not any injury . Thanks.
Symptoms:  If i sit for sometime on the floor by folding my leg, I cannot open it(Left leg) and stand . it takes a few moments to get the leg strength and I get pain at back side of left knee.
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