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presents
Wheeless' Textbook of Orthopaedics

Cortex Screw: 3.5 mm




- Discussion:
    - for fixation of small bones such as forearm, fibula, & clavicle;
    - core diameter of 2.4 mm and requires a 2.5 mm drill bit;
    - 3.5 mm titanium shaft screw used as lag screw in a LC-DCP 3.5 mm
          - designed as partially threaded screw w/ shaft diameter of 3.5 mm;
          - hence it is used as a lag screw;
          - since the smooth shaft has the same diameter as the thread it provides
                  improved stiffness and strength with the screw is used, as a load
                  screw for axial compression;





Original Text by Clifford R. Wheeless, III, MD.