I had meniscus repair surgery 3 months ago and still do not have full knee extension. I have been sitting in a chair with my foot on a stool and hanging an 10 pound weight at the knee, I do this for 10 minutes three or four times a day. It will pull the leg straight but I still am not able to lock out the knee when standing. It affects my stride when walking. I do leg extensions and curls on the machines at the gym. Are there any other exercises that might help.