<s>[INST] I have a torn patch on the left side of my back the doctor says it is artritis it gives me terrible pain in the back of my thighs I take aleve pain killer but I still have a lot of pain and stiffnes in my legs and some feels like a knot please help me [/INST] HIWell come to HCMI really appreciate your concern, it may not be arthritis but it could neurogenic pain and chances of sciatica is likely, you can of course have the pain killer but underlying cause would be matter of concern, and for that better to get done the MRI test,  hope this information helps. </s>