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Lag Screw Placement

    Screws placed in lag fashion enable the compression of oblique angled fractured bones, which accelerates osteogenesis.

    A glide hole is drilled in the near cortex using a drill bit, which is the same diameter of the outside of the screw thread. Make sure a drill sleeve is used to protect the surrounding soft tissue.

    Place a smaller drill sleeve within the proximal hole and use a drill bit the same diameter as the core diameter of the screw.

    Cut a bevel using a countersink at the near cortex, which will increase the contact between screw and bone.

    Use a depth gauge to determine the screw length and use a tap to cut threads in the far cortex.

    Insert the screw and tighten to create compression. The screw only engages with the far cortex during tightening, which results in compression.

    The table below will help in selecting the appropriate drill bit for each screw sizes

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