hello. this is dr jay here. I would like to try and answer your question please be assured that the problem is not threatening and easily manageable. provided your history, the diagnosis of a specific condition is difficult without required tests but in such cases the most common cause is Osteoarthritis and other causes can bebthoughtvof once its ruled out. I suggest you first take a self test called the Oxford Knee Score. then you can visit the doctor for further tests as the diagnosis does require tests I don t think this is absevere case though as the characteristic pain seems to be absent hope you feel well soon do rate the answer and leave your feedback regards dr j s kshatri