HELP !! 3 Years, 4 operations and still no difference

[tamm96]

HELLPPP !!
I'm 18 and when I was 15 I underwent my first knee surgery in January 2011, which was a tibial tubercle osteotomy of the right knee and a further one on my left knee in October 2011. My left knee we thought was successful so proceeded to further surgery in 2013 on my right knee which was an MPFL reconstruction which has been successful.
However due to the problems ad how bad my right knee was, when I experienced very little pain I went back to playing sport. This past month I have realised my left knee is not completely right as it iften locks straight and I cannot move it for around 30 minutes - 1 hour. I have been to the hospital and they have said that all my ligaments are fine just my kneecap is sitting slightly further north of the joint than it should be however there is no surgical option just to hope it moves back down.
Is there any advice anyone can give me in order for myself to hopefully manage the pain and further increase the mobility of my left knee as flexion is only around 30 degrees pain free after that the pain is unbearable to flex.
Thank you