HI
Hi there. If he is having pain from the thigh going to the knee, it is possible that there may also be hip arthritis as well. Avoid squatting, cross leg sitting, kneeling, climbing stairs. Apply cold compress for relief. Must perform muscle strengthening exercises and not over exert in exercise. Must prevent obesity and eat healthy. Keep well HY Chat Doctor.  This is most commonly OSTEOARTHRITIS whicChatDoctores about in older age persons.