Basically about 4 months ago I had knee surgery due to pattela tendonois, rehab was going well and I was back running on a tread mill for short periods with no pain. I was then given a rehab excercise which involved hoping on my bad leg. Since performing this excercise my knee has become worse pain when walking and straightening my leg. I spoke to my MO regarding this however I am worried that I may be medically discharge if this has caused a serious injury through an excercise which I was instructed to do. Where do I stand?? cheers.