Ao Principles of Fracture Management by T.P. Ruedi, W.M. Murphy

By T.P. Ruedi, W.M. Murphy

This article is an up-to-date version of the "bible" of AO ASIF services. recognized easily because the "Manual", this paintings includes such good points because the availability of CD-ROMs and content material at the world-wide-web for the 1st time. It offers the addition of "call outs" for simple cross-referencing. 1000s of full-colour intraoperative images, radiographs, and illustrations open a visible road to the complete content material of the guide. The CD-ROM bargains a entire collection of AO instructing video clips, permitting the viewer to consult various sections as wanted. easy and particular tutorial video clips support visualize unique innovations.

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Ao Principles of Fracture Management

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Multifragmentary fractures seem to tolerate more motion between the two main fragments because the overall movement is shared by several serial fracture planes, which reduces the tissue strain or deformation locally. Today there is clinical experience and experimental proof that flexible fixation can stimulate callus formation, thereby accelerating fracture healing [10, 14]. This can be observed in diaphyseal fractures splinted by intramedullary nails, external fixators, or bridge plating. However, if the interfragmentary strain is excessive (instability), or the fracture gap is too wide, bony bridging by callus is not obtained in spite of good potential callus formation (hypertrophic non-union) [15].

The ductility of a material determines the degree to which a plate, for instance, can be contoured. As a general rule materials of high strength such as titanium alloys and highly cold-worked pure titanium offer less ductility than steel. Ductility provides some forewarning of impending failure, for instance during insertion of a screw. 5␣ mm cortex screw (ISO 6475) tolerates more than a full turn after reaching its elastic limits (Fig. 3-3). Titanium, having a lower ductility, therefore provides less of a prewarning, which means that the surgeon should first acquire some bench experience leading to a different handling technique (Fig.

5 mm narrow plate 7 Torque [Nm] Angle of deformation under load [ °] 8 0 1 2 3 4 5 6 7 8 9 10 11 12 Torque measurements (Mean values of more than five measurements) Fig. 3-2: Fatigue resistance—the influence of material and design. Fig. p. titanium under conditions of controlled angle of deformation. Under low cycle conditions steel is better. p. titanium is superior. The influence of the design was demonstrated, whereby the LC-DCP with its continuous stiffness along the plate proved to be superior to the DCP.

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