When the surgeon looked during the keyhole exploration his ACL had gone completely. There was nothing to hold his knee cap into place. The first op used a webbing which then in turn, went. 15 years later he had a new ACL constructed from a piece of his hamstring.
He went back to his doctors because his knee cap kept dislocating. He fell over in the street when it gave way (stone cold sober I might add) with his knee cap at right angles to his leg. He was in surgery within 2 months.
My other half ripped his ACL in a bike accident, which was only aspirated at the hospital. He walked/limped on it for several months (albeit in a lot of pain) before the doctor finally diagnosed it.
As Bong was going past the north stand, on the stretcher, it looked as though his knee was...