Hi,
After noting your history of
knee injury and subsequent pain in thigh and back my opinion is as follows:
The knee injury causes are not yet diagnosed well unless you have done
MRI of knee. So first of all get MRI.
Consult an Orthopedic Surgeon for proper clinical evaluation.
The cause of pain in the thigh and back can be due to muscle spasm that has persisted or
fibromyalgia or
Nerve compression at lumbar area.
Once a proper clinical evaluation then next step is investigations.
Proper diagnosis can lead to a specific treatment.
Till then do not put strain on muscles, back and knee; give rest or use support.
Take care. Hope I have answered your question. Let me know if I can assist you further.
Regards,
Dr. T. Chandrakant, General Surgeon