1. because you said it an ARTHRITIC problem, there are numerous causes of them, could be RA, OA, Gout,Bursitis
, or due to injury.
2. have you consulted a Rheumatologist/Orthopedic for that cause who will probably go for investigations like Knee joint X-ray,RA factor, Uric acid level, ESR,CRP or any external visible bony deformity
3. Is the pain irritating or debilitating??, and please tell about the AGE and DURATION of the symptoms and how it is affecting the quality of life??
4. as TYPE of Arthritis
in not known, thus treatment can't be told as for now, but make sure NO treatment stops progression of this disease, so aim is to MANAGE the disease to prevent/delay further deformity, with herbal Medicines,stretching and deep breathing exercises.
5. you can consult an Ayurveda/Homeopathic
Physician for the same once everything comes normal after evaluating with Rheumatologist and Lab Investigations.