Question
Hi there, the muscles behind my left knee are very weak and I can feel that I don't have a strong footing when I stand. I don't have any pain at all. Just that tense feeling. It just feels very weak and I can feel it when i'm sitting, lying down and standing. I'm not sure if it is a pinched nerve, vien, or something else. I had an x-ray and ultrasound on my knee last year and the doc said it was ok; however, i still have the same problem. I'm not sure what else do to..do u have any suggestions?  

Answer
Sonia,

Get an examination by a doctor that understands both knee orthopedics as well as biomechanics and soft tissue disorders.  Most primary care doctors (doctors of internal medicine) do not have a good handle on this area.  Most good chiropractors can help you with this.  Reflex weakness to knee muscles is common following knee surgery or when there is osteoarthritis in the joint, but it can also be a reflection of pelvic joint dysfunction, a lumbar spine (lower back) problem (such as narrowing of the spinal canals) or a simply a muscle adhesion issue behind the knee.  I don't know anything about you, e.g. your medical history, age, etc.  I would suggest you find a chiropractor with training in extremity joint conditions and soft tissue disorders.  

'Hope this helps.

Dr. G