Got it, thanks Terry. I've never measured but don't have a problem standing from a sitting position. I do exercises at the gym where I hold a weight and stand from a seated position on a bench. The bench is probably 24" high, not sure.

Sounds like a quad-strength issue to me. There are a lot of exercises you can do. A simple exercise is to clasp your hands in front of you, bend at the knees - try to get your thighs parallel to the ground, no further, and then stand up, rinse and repeat.

I hope that helps. You have plenty of flexion. May just need to strengthen your quads. It's gonna take time and maybe won't work, but you'll get stronger quads either way.

Best of luck to you. At your degree of flexion, you've done a good job with therapy. Joe