Hello, Pain along with numbness is a sign of nerve involvement. Firstly I will advise for the uric acid check. If that turns normal than we need to look out for the nerve involvement. Usually, when there is arthritis of the knee there will be a change in the gait and that may lead to change in the muscle physiology in the lumbar spine leading to spasm and deviation of the knee and can lead to nerve impingement. I will advise to try this out if it helps you. Hot water fermentation for the lumbar spine, core stability exercise, hip muscle strengthening exercises, static hamstring, static Quadriceps, straight leg raise and ankle toe movements. Wait and see if this exercise prescription is helping you for reducing the symptoms. Hope I have answered your query. Let me know if I can assist you further. Regards, Jay Indravadan Patel, Physical Therapist or Physiotherapist