Leg rope and knee injuries?

Stuffed my knee last weekend down Angourie way. Third wave of possibly the best swell Ive experienced
Looks like its a partially torn medial ligament. Blew the take off and got pumelled, but it wasn't impact at the bottom that did it. It was about 6 seconds into the rag doll session whilst well and truly under water that I felt something let go in the right knee. Pretty sure I was clear of the board so thinking it may have been the legrope pulling the knee in a lateral direction (the medial ligament is whats gone).
So my question is has anyone else out there experienced this. Also does anyone wear a leg rope on the thigh to reduce leverage at the knee joint?

So my question is has anyone else out there experienced this. Also does anyone wear a leg rope on the thigh to reduce leverage at the knee joint?