My son fell (hard) and landed on a sharp corner of a block of solid wood; he has (what looks like) a huge hematoma located on the very top of tibia/ tibial plateau with swelling all around. I iced, elevated, and ace bandaged it, but no change. He s walking, but with a limp; and he can straighten it but can t really bend it. Could it be something more serious? At what point should I stop home treating him, and bring him to be seen? Thank you, Susie