Hello Sir, My Mother Is 60yrs Old Her Left Leg

Hello sir, my mother is 60yrs old her left leg is paining always her history was that she told me since 6yrs back during massage in the Left leg one type of sound arised from knee joint laterally and till now pain is there. She massaging with ayurvedic oil for reduces pain and it reducing. She's mild diabetic since 1 yr taking diabetic medicine since two months. Past history is she underwent MNG thyroid surgery 6 yr back, underwent cholecystectomy. Now I want advice from you sir what should I do for leg pain?