I had a LTKR in May, 2016. I basically have done OK. Knee is not perfect, fine. Anyways, about 2 weeks ago, when I would stand up after sitting or laying for a while, my knee would feel wobbley/unstable at first. After standing there for a few seconds, I am fine. A few things--I got a flu and pneumonia shot. My OS did say OK to that. Also, I got in a wrestling match in the middle of the night with the cover, but don't remember hurting it. I am a 1st grade teacher, who has gone back to school since being on remote teaching and summer break since March 13. In order to combat this feeling, i will do a few leg exercises, and when I stand I am fine. I have danced at my niece's wedding, taken down the swimming pool, trimmed a couple bushes. I am scared to death of needing a revision. Also, I am currently waiting for the OS to call to do the RTKR in October. Now that knee hurts, but doesn't wobble. I do have an appointment tomorrow with the OS to check the LTKR out, and to get a date for the right surgery. I am wondering if me sitting around for 5 months weakened my muscles, or if something is seriously wrong with me.