Hello dear, The symptoms as mentioned in your post can be attributed either to musculo-skeletal injury or inflammation of the joint- Osteoarthritis. X ray of the knee joint will be helpful in clinching the diagnosis. Symptomatic relief can be obtained by heat therapy, application of analgesic & muscle relaxant gel, intake of analgesics like Diclofenac (to be taken after food) + Pantoprazole (to be taken 30 minutes before meals). Supplements of Calcium & Vitamin D can be included in diet which will help in strengthening of bones. Physiotherapy exercise will also be helpful. Till then, maintain adequate hydration & nutrition status, take proper rest and avoid stress. Wishing a Good Health. Take care.