I have what I'm hoping is not too dumb of a question. How do you know what your range of motion is after a TKR and working on rehab? It's fairly easy for me to figure out 0 degrees and 90 degrees and then interpolate something more or less than that. Is there a gauge? Right now I can bend my knee to what I think is around 120+ degrees based on something between 90 degrees and another 45 degrees from their. Psst…I'm all in on guestimates but was wondering how others figure out what their flexion is.