<s>[INST] I have had difficulty walking and severe stiffness and pain in the right hip since May, 2011. I had total hip replacment in Sept 2006 and have been fine since then,. I had mri and x-ray of the right hip and the sport med doctors says it looks ok. I m in physical therapy 2x s a week. The muscle that runs down the front of the thigh get really stiff and at night has shooting pains. the abductor muscle is really sore and at times I cannot life my right foot off the ground without assistance. My lower back on the left side has also become sore and stiff. The implanted component is made by Zimmer. [/INST] Hello, If MRI and X-ray of affected hip is okay then there are fewer chances of any abnormality with your operated part. In that case such symptoms may be due to affection of spine. I will advise you to have an x-ray of your spine also to rule out any spine issues. Till then, you may have a good analgesic like Advil or sleeve for relief. I do agree with your doctor in having physiotherapy for this issue. Take care. Hope I have answered your question. Let me know if I can assist you further.  </s>