Knee Pain during Leg extensions#1193

I saw this beacuse I am apart of the Facebook group. I have a gym membership and I try to go 3 times a week. I am making good progress… However I have an issue with Knee pain during leg extenstions.

When I was in high school, I snapped my knee in a diving accident(2001-2). I had surgery and it has been my weak knee ever since. I can leg press, Treadmil, Elipical machine squats, no problem, but when I do the leg extensions, My hurts when I am releasing the weight. I even put it on the lowest setting and It just hurts. It is my right knee and it hurts, at least it feels like it hurts on the underside of the knee cap out outter kneed. IT is only when I release the weight and slowly bring it down. I even bought a brace for it and I dont understand what is going on.

Any thoughts?

Since youre able to do other leg exercises, id stop that one for now and get it looked at by your doctor