Hello. This seems to be infection but esr rises higher than the value you mentioned. But if the pus culture has been done then it might be tb. Anyway if u have started the medicine then you must continue it for nine to twelve months . U must not worry as this infection takes time to settle down. After completing the course. U must an xray and visit orthopedic surgeon again for review but don't miss even a single dose otherwise u May develop resistance against the infection. For pain u may use painkillers and do regular physio therapy. Meeting a physiotherapist may be a good idea. Hope that answer the question. Thanks