Knee injury

If I try to stretch my quadriceps by bending my leg the back of my knee tightens up so that I have difficulty in straigtening my leg.It is as if it goes into a slight spasm. The same applies if I am sat down for sometime.

I recently had a long car journey at the problem started soon after that. I am still able to run proveded I don't

try and stretch beforehand.

Has anyone any ideas wht the problem may be.I

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