Ram's wide receiver puka nakua was carded off with a re-aggravation of a knee injury during Sunday Night Football let's break this down puk's initial injury was reported to be a bur citis in early August these bursts are fluid filed sacks that cushion the knee and sometimes when the knee strikes the ground repetitively these sacks can become inflamed we can see his knee taking a hard impact during training camp on this play and it's very possible he may have sustained a knee ligament injury here which was under reported Flash Forward descended Knight there was a play where his knee slammed against a violently and you can see here significant posterior translation of the tibia when the knee slams against a Turf like that the femur continues its forward momentum putting significant stress on one specific ligament this guy right here the posterior cruciate ligament this ligament stretches and subsequently can cause a tear after the initial play he did try giving it a go and the next time his knee slammed against a turf was his last the average time out with a grade 2 PCL is 3 to 6 weeks if a Grade Three it could take 3 to 9 months in this video here you do see a Grade Three Sprain and you can see how much posterior displacement this knee has the great thing is unless there's a complete rupture the majority of these do not require surgery it has a good blood supply especially when compared to the ACL whenever you get this type of partial tear the body will form scar tissue to build up the Gap where the tear was and this eventually will provide strength back to the ligament wishing puka nula safe and speedy recovery