I believe that, if Mac had the same deformity that Brodie had, it would likely already shown up with an ACL injury already. It's called a "keystone arch" in the femur, where the ACL passes through. Viewed posteriorly, the arch has a "keystone" profile, rather than a nice Roman arch. This predisposes the ligament to getting pinched and is the cause of many non-contact ACL injuries. I had it, although it didn't cause my injury, which was caused by another player falling on me. As my orthopedist explained it to me, I asked him if it would predispose me to rupture the graft. He just chuckled and told me that my left knee no longer had it. As part of the procedure, he'd reamed out the arch to a rounded Roman profile. Still have it in the right, though...