hi, thanks for providing the brief history of you. as you mentioned you have undergone the TKR almost 6.5 years back and now giving you pain at one particular place in knee. what i recommend you is to first take hot water fermentation and relax the muscles first which has got into spasm. post that try continuing the exercises which you have performed in the past, post knee replacement. Also to mention that certain times weakness of muscles leads to pain symptoms as repetitive pressure on the muscular tissue. you can also take one x-ray just to remove the doubt if the prosthesis is dislocated. where as per me chances are less. Also try performing exercises at your own and get required strength in the muscles of the knee, hip and core . If you fine there is no Change then you need to take again a physical therapy session to improve the strength in your muscles. As guidance always give precision. I have seen people complaining me about the pain post TKR but only thing I have come across the reason is the patient have stopped doing any exercise which has lead to again the symptoms. So I Advice them again the physical therapy and intense exercise which have made a 100% difference. they come back to functionality again. I hope to hear from you soon and you will be seen partying again. regards