Months ago I tripped landing on my kneecap. I had a superficial laceration where I landed. Then a few weeks ago my knee began to hurt, localized tenderness, pain, Weakness in thigh/leg, numbness in certain areas of the kneecap and balance issues . Lesions appeared, I thought I somehow got glass in my knee but what I came across is a white bony Substance imbedded in my knee. What could that be?