Maybe not....: An acute inability to straighten the knee often results from a torn meniscus, or a "loose body" within the knee. In addition to a good examination, you would need xrays and perhaps an MRI scan. If this is longstanding, but you are functional and pain-free, perhaps an exercise regimen would be all you need...You need to see an orthopaedic knee specialist...
Answered 4/26/2016
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