Hello,
Clicking of the left knee and pain despite arthritis is commonly due to
patellofemoral syndrome. It can be treated supporting braces, tapping,
rehabilitation exercises, icing, etc. If
non-surgical treatments are not effective, surgery may be recommended by the treating doctor. It can also be due to
osteoarthritis or
cartilage degeneration. Ligament or tendon snapping, either due to injury.
Other medical conditions that can cause similar symptoms are abnormal synovium, or the lining of the knee can be inflamed, meniscal tear could be a cause. Get clinically examined by an orthopedist. Get required imaging tests done so that treatment can be started at the earliest. To get rid of pain, you can take Naproxen or Combiflam, one SOS when needed after food.
Take care. Hope I have answered your question. Let me know if I can assist you further.
Regards,
Dr. Nupur K., General & Family Physician