This could be because of ligament ruptures, overweight, long time standing, and can be due to arthritis etc. For a proper prescription, you must tell the proper history of the patient, and for further details, you must have few examinations. You can discuss this case with me. As of now , on the practo app, there are some technical issues related to video consultation. If it's not urgent, you can try calling after two days.
Next Steps
X-ray
Serum
Uric acid
ESR, RA factor
Health Tips
Do massage with medicated oil at least twice a day.