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Cut-out patterns (two-dimensional interpretation). Primary position of the lag screw in the femoral head (points in the zone template), direction of migration and approximate penetration point of the lag screw (arrows). Red arrows: 31-B2.1 (basicervical) fractures, green arrows: 31-A3.3 fractures, black arrows : other fractures; 43 cases, central cut-out has not been considered.
