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Angular correction of lumbosacral kyphosis and improvement of the anterolisthesis of L5 over the sacrum by one Meyerding grade2 is mostly achieved through prone patient positioning over the Montreal mattress. Transfixation from S1 into L5 is supplemented by stabilization to L5 (top) or L4 (bottom) to allow lordosis restoration and a solid fusion with the use of iliac crest bone.
