Can pain and popping sound during jaw movements indicate osteoarthritis?

Hello doctor,

I am 35 years old, 5 feet 11 inches tall and weight 79 kg. Vegetarian diet. Before two years, due to stomach disturbance and pain and some popup and cracker sound occurred in my knee joints. I visited the doctor and he suggested me for a laboratory test of liver function test and all reports were in normal range except sugar which was 138 at that time and gave me some medicines and referred to orthopedic for joint pain. I have visited an orthopedic specialist. He took an X-ray of both leg, knee, and told that it is an early stage of osteoarthritis of the knee and he suggested for MRI and I got my MRI done. In the MRI report, it is mentioned that left knee has been affected with osteoarthritis. After that, he gave some medicine for 10 days and referred to a physiotherapist for exercise and weight loss. I have visited as he told and now I have reduced my weight and now there is very little pain remaining in my left knee but now my other joints like the left hand thumb, finger, and both hand and knee have popup sound during movement. Kindly diagnose my problem and suggest the treatment for the same.