<s>[INST] I m a 64 yr old woman that has back pain and arthritis. Getting old is not fun! What causes the knee to go out? I was walking in the kitchen & for no reason my knee gave out & I hit the floor. The last time it happened was a few years ago. Can be be very dangerous depending where you may be at the time! YYYY@YYYY [/INST] Hi,In my opinion your I don't actually think that your knee problem is due to your arthritis unless you may have spinal nerve herniation I think it is due to another underlying disease or condition if you faint or became a bit hypo or hypertensive or such, sometimes spinal nerve compressions can cause difficulty or painful to walk at all but not to go out. For now, I suggest you to try to decrease your weight, hot fommentation with topical gels and physiotherapy are helpful, NSAIDS like Advil, muscle relaxants are recommended.Hope the above information helps you, Any further clarifications feel free to ask.Regards,Dr. Ahmed Aly Hassan </s>