Hello There What Actually Happened Was That I Was Running

Hello there what actually happened was that I was running around the pitch and I had to jump over the barrel for pe I was out of stamina around the 9th lap around a big pitch and I tried to jump over the barrel and landed on my knee and straight away I felt extreme pain and got a swallowed lump underneath my knee and it hurts when I apply pressure to it.


Any idea what might of happened to me