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It comes down to the angle of the cranial tibial caudal slope. If you look at the bones of the knee from a leteral view (ie the distal femur and the cranial tibia) there is usually a slight caudal slope of the cranial tibia (in most people). In some people there is a steep slope which makes them pre disposed to an ACL tear. Robinson must have no slope of the tibia which means he doesn't "need" an ACL. What this means is the knee is stable when loaded.
Sadly however, he had a partial meniscectomy. The caudal horn of the medial meniscus was damaged and removed. This makes his knee unstable........and means he'll be getting a total knee replacement between the ages of 50-60. Enjoy dressing up as a ballerina you big poof.........your days are numbered
He has postponed a knee reconstruction to make the RWC. It is his big chance at a rugby world cup winners medal and he knows it.
unfortunately, reality is against him.
It is unlikely that his knee is going to be able to cope with scrummaging against the best tightheads in the world and his lateral defence will be slower.
To win the world cup, Australia needs props to scrum with mongrel. You don't want one of your props carried off in the first five minutes of a world cup final and especially if it was an injury that they took into the tournament.
A real sh1tter really
Robinson was a key to the RWC dias and the confetti, champers and of course Bill
It is unlikely he can scrum with the intensity exspected of a world class loosehead and it would be foolhardy to pick him.
I hope I'm wrong but common sense suggests I aint
If he gets lots of scarring and thickening of the joint capsule it may reduce the mobility of the knee but enable it to be functional. If he gets needled for games and he wears heavy strapping on it, it's just possible he might make it........but he'll shorten his career in doing it.
It won't be pretty when the needle wears off either