Hello, it will be better if you mention your age and gender along with your question.As you said you have arthritis of knee joint.I would like to know if the arthritis is only limited to your knee joints or any other joint involvement is present?Since how long do you have this problem?Are you seeing a rheumatologist for your illness? If yes then what medicines are you taking currently?If you have not consulted a rheumatologist for your condition, I would suggest you, see one as soon as possible.Because physical examination with history is crucial to diagnose your condition because arthritis is seen in many other diseases/conditions.The reason for arthritis can be autoimmune or infectious or some accidental injury which was ignored.So to know the proper reason it s better to see a doctor in person and take medicines advised by the doctor. You said you are doing exercises with help of physiotherapist which is a very good thing but lone exercise won t be able to help you recover from it.You have to take proper medicines depending on the cause.There is a restriction in movement due to inflammation and pain with the stiffness of the joint which is common.If it is autoimmune then need to slow down the progression of the disease with anti-inflammatory medicines, you need some other disease-modifying medicines which will help to decrease the inflammation and slow down the progression of the disease.For temporary relief, you can take tablet Ibuprofen or tablet Diclofenac twice daily after food for 2-3 days which should help in relieving the inflammation and pain.I would suggest you, visit the rheumatologist as early as possible without any further delay so that necessary treatment can be given to help you recover from this condition.Stay healthy and do feel comfortable for any queries you have.