A few days ago I was running and jumped down a staircase. When I landed my left knee gave out and I have had a limp since. My knee does not extend all the way and does not flex past 90 degrees. When I attempt to flex my knee I feel pressure/ pain and there is a visible bump that protrudes on the lateral side of my knee beside my knee cap only when I attempt to bring my leg toward me. There is no popping or locking with the motion I do have. I m supposed to have an appointment with orthopedics in 20 days but I m worried that will be too long to go without knowing. Then it will be weeks before I get an mri if it gets that far.