In 2007 I started a strength building and sprinting program. At the end of 2007, I mildly strained both my left and right hamstring tendons while doing leg curls. I wasn’t able to do leg curls again without pain, even after resting for a while, so I stopped doing them. I kept on doing squats, deadlifts and sprinting and they were ok.
Around April of 2008, I started to notice some pain in my knees when turning sharply. Then one night I sat down in a couch, got up and I couldn’t walk without pain. So I saw some physios who didn’t help, and eventually one that said I have a patellofemoral dysfunction and I need to stretch my hamstrings, ITB and calves. I did my stretches every day but my flexibility never improved, and my knee problem was pretty much the same. Eventually, in 2009, I strained my hamstring tendons again doing explosive movements in the gym. I lost a lot more flexibility and my knee pain became worse. As a result, I lost a lot of strength as well.
Now my knee pain is very bad; I can’t fully straighten my leg when lying down or standing. I had an MRI of the knee and an ultrasound of my hamstrings: both looked normal, with no sign of a tear or damage. I’m pretty sure my inflexibility is the cause of the knee pain. I can barely get my hands past my knees in a forward bend. But no matter how much stretching I do, I can’t increase my hamstring flexibility. I’ve tried stretches and yoga for at least 6 months now. It might improve for a few hours or a day, but it always goes back to the same level.
Does anyone know of possible reasons for this and what to do about it?