3 weeks since I had my surgery

It's been 3 weeks since my surgery. I've had my stitches removed, started physical therapy and have discovered how weak my quadracept muscle is! The physical therapist has given me a new device to measure the amount of strength that I'm exerting with the muscle. Man is it whimpy! I can't believe that in a matter of months, since April, that the muscle would have lost so much strength. I didn't stop exercising, I continued in my tap class and walked on a regular basis. Oh well, just more work to do.