I hit my knee on a rock and also may have twisted it when swimming two days ago. Yesterday it was kind of swollen but not too bad, it did however have kind of a swollen bump where I hit it( right below the knee cap). Yesterday I could not bend it because it felt like it was too swollen to bend and it was really stiff. Today it also is hard to bend but is alittle easier, I am however in more pain today. I seem to have hit it right on the bone so I m hoping that it s just a bruise on the bone. Would that make sense? Or is it something more serious? I hit my knee on a rock when swimming two days ago. Yesterday it was kind of swollen but not too bad, it did however have kind of a swollen bump where I hit it( right below the knee cap). Yesterday I could not bend it because it felt like it was too swollen to bend and it was really stiff. Today it also is hard to bend but is alittle easier, I am however in more pain today. I seem to have hit it right on the bone so I m hoping that it s just a bruise on the bone. Would that make sense? Or is it something more serious?