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Preoperative planning

Screw position

Screw position

Lag screws should always be inserted as perpendicular as possible to the fracture plane where they cross it.

Lag screws inserted through a plate give better stability than screws outside of a plate. Whenever possible, plan the plate position so that one or two screws can be inserted through the plate and still perpendicular to the fracture.
However, in some situations, one, or both, lag screws have to be inserted outside of the plate, depending on fracture geometry and surgical access.