I got hurt yesterday morning on a horse. I hit my knee pretty hard, and instantly it hurt. It swelled up last night...but it look like my knee cap itself was getting bigger...there wasn't a lot of fluid. I can't move it, and I can't walk. When I do it feels like it's on fire. This morning is was puffy, and now you can't even see the knee cap. it's turning black. Do you think it's badly bruised, or possibly broken?