Ao Principles - Synthes Titanium Trochanteric Fixation Nail System Technique Manual

AO Principles

In 1958, the AO formulated four basic principles, which have
become the guidelines for internal fixation.
Anatomic reduction
Precontoured plate assists in reduction of metaphysis to
diaphysis and facilitates restoration of length and rotation.
Stable fixation
Locking screws create a fixed-angle construct providing
angular stability.
Preservation of blood supply
Tapered end facilitates submuscular plate insertion. Submus-
cular insertion may help to preserve tissue viability.
Early, active mobilization
Early mobilization per standard AO technique creates an
environment for bone healing, expediting a return to optimal
function.
1. M.E. Müller, M. Allgöwer, R. Schneider, and H. Willenegger, Manual of
Internal Fixation, 3rd Edition. Berlin: Springer-Verlag, 1991.
2. M. Baumgaertner, S. Curtin, D. Lindskog. "Intramedullary Versus
Extramedullary Fixation for the Treatment of Intertrochanteric Hip Fractures."
Clinical Orthopaedics and Related Research, 348, pp 87-94, 1998.
3. D. Hardy, P. Descamps, P. Krallis, et al. "Use of an Intramedullary Hip-Screw
Compared with a Compression Hip-Screw with a Plate for Intertrochanteric
Femoral Fractures." The Journal of Bone and Joint Surgery, 80-A(5),
pp 618-630, 1998.
4 Synthes Titanium Trochanteric Fixation Nail System—Screw Option Technique Guide
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