I tripped this afternoon  and landed on one foot - immediately after it happen could not bear weight or bend  my knee - it hurts worst if i bend and if i half bend straightening it is very difficult  , it is swollen and pain, deep discomfort . I have use Ice, Motrin and no help .
HAI, this doesn't look like a bony fracfturemaybe a soft tissue injury to the ligament, nerve, or a muscle, or meniscal injirypls go for a MRI scan to rule out the problem. Meet an orthopedic surgeon