I am having injections in both knees on Monday. I have been told that they might not work as my knees are worn down to the bone so there is no or very little soft tissue left! But I have to try them as part of the process to get knee replacements in the future. I cannot have an operation on my knees for six months after the injections so will use that time to lose weight! When I last saw a consultant two years ago (privately as I have medical insurance) he said that at age 58, I was too young as he thought 70 was the best age! I am really incapacitated by the pain when I walk so cannot cope with food shopping, other than a quick trip to a corner shop, walking more than a few yards or gardening. So I am going along the NHS process and when I have ticked off every interim measure and knee replacement in the only option ( in six months hopefully), I am then going to go private! In the meantime I just get on with doing what I can, living on my own forces me to cope!
Back to the original question I was told not to drive for 24 hours as I am having both knees injected.