The posterior cruciate ligament lies deep in the knee and prevents posterior movement of the shin bone on the thigh bone, which makes it an essential stabilizer of the knee (LaPrade et al., 2015).
The PCL is most commonly injured when the knee is hyperextended or, in other words, bent backwards. This can happen when you land from jumping with the knee straight or when a fellow participant hits the front of your knee joint.
Management can involve bracing and strengthening rehabilitation. Surgery is not a common intervention
LaPrade M. C. et al., 2015, Emerging Updates of the Posterior Cruciate Ligament- A review of the current literature, The American Journal of Sports Medicine, 43(12)