A couple of years ago I was in a serious auto accident wich ripped my pettler tendon from the pettler pole now I have serious atrify in my leg and also the knee itself is very weak I continue to do my leg exercises with no help my exercises consist of leg presses,leg curls,leg extensions,seated calve raises,lunges,and stationary bike.Maybe I am not doing enough or I am not doing things right but I cannot take this anymore any help would be great......