I cant ear any weight on the injured knee for more than 10 minutes without feeling an uncomfortable stretch in the back muscles just wondering if this because my back is compensating for the lack of support from the knee joint....I ve been going through this disabling condition for the past 10 months,,,I was running and somehow ended up with a very strange left knee injury. I never fell so I must have just stepped wrong or hyperflexed the ligaments,,,its been hell though I lost complete support on that joint feels very unstable kinda mushy and it looks like my back is now compensating,,,2 orthopedists said theres nothing wrong with my knee and recommended me to do physical therapy to strengthen the quads buttocks and hamstring muscles but it has not been very effective for me on the contrary it just makes the interior of the knee hurt a lot more i might have injured the pcl or acl,,,,im gonna see one next week hopefully Ill be able to get another mri to figure out whats wrong...I just stay positive trying not to overdo it and being patient...but the reality is that this injury sucks...does anyone know how long it takes to heal if it can actually heal on its own...or would it be better to get a knee joint replacement ,ligament reconstruction or an above the knee amputation? i know how drastic all these alternatives sound but Im just so confused....could it be just a very slow healer?