can you bear any weight on the injured knee for more than 10 minutes without feeling an uncomfortable stretch in the back muscles? just wondering because thats what I ve been going through 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 and it looks like my back is now compensating,,,2 orthopedists said theres nothing wrong with it 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,,,its quite disabling and I would suggest for you to get an mri and see a specialist,,,im gonna see one next week hopefully Ill get more info! just stay positive try not to overdo it and be patient...trust me I know how much this injury sucks...