Factors That Increase Frame Stability, contd.
Note: In the tibia, since sagittal bending moments are approximately two to five times greater than
those in the coronal plane, placing the frame in the sagittal plane will increase frame stability.
To he mechanically effective, the stiffness of the external fixation frame should match the forces
and moments at the fracture site. This sagittal-to-coronal stiffness ratio can be achieved if the
Schanz screws are oriented in the AP direction (2).
(2) Behrens, F. and K. Searls. "External Fixation of the Tibia." British Journal of Bone and Joint Surgery 68 (1986): 246-254
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