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Home / Trauma / Bone Screws / Cortical Screw

Cortical Screw

Categories: Bone Screws, Trauma

What is a cortical screw?
Cortical screws tend to have fine threads all along their shaft, and are designed to anchor in cortical bone. Cancellous screws tend to have coarser threads, and usually have a smooth, unthreaded portion, which allows it to act as a lag screw. These coarser threads are designed to anchor in the softer medullary bone.

The function of the cortical lag screw is to compress one piece of bone against another. This improves the stability

of a reduction, so it is commonly used to achieve absolute stability, leading to direct bone healing, as opposed to healing with callus.

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    • Specifications

    Cortical Screws are available in 3 different diameters i.e. 2.7mm, 3.5mm, 4.5mm. Their lengths are also different varying according to the sizes of the diameters.
    The 2.7mm Cortical Screws are available from 10mm length to 30mm length used with 2.0mm Hex Screw Driver.
    The 3.5mm Cortical Screws are available from 14mm length to 60mm length used with 2.5mm Hex Screw Driver.
    The 4.5mm Cortical Screws are available from 20mm length to 80mm length used with 3.5mm Hex Screw Driver.
    These screws are having the self – tapping functionality for ease of use for the surgeon.
    Available in Stainless Steel & Titanium materials.

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