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Dr. Amir Javed.
The pain in your hip is most likely due to arthritis as in your knee joint which I already mentioned above. I will also like to have your hip x-ray or MRI hip joint will be beneficial. I am concern about the lump behind knee which can be baker's cyst or any clot formation very important to rule out that. Follow the guidelines which I gave above & you will find those helpful. Let me know if you have any further question. Best wishes.