By T.P. Ruedi, W.M. Murphy
This article is an up-to-date variation of the "bible" of AO ASIF services. recognized easily because the "Manual", this paintings includes such positive aspects 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. 1000's of full-colour intraoperative pictures, radiographs, and illustrations open a visible road to the total content material of the guide. The CD-ROM deals a accomplished collection of AO educating video clips, permitting the viewer to consult assorted sections as wanted. uncomplicated and particular tutorial video clips aid visualize unique strategies.
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Additional info for Ao Principles of Fracture Management
2-23). Conventional plating is being increasingly replaced by using internal fixators (Fig. 2-24). These devices, like the PC-Fix, are splints which do not require being pressed “plate-like” to bone. Thus, the area of contact can be reduced to small points isolated from each other. When developing these implants it was realized, at the same time, that by fixing the screw heads within the plate of the PC-Fix, the length of the screws could be reduced to unicortical dimensions only. This allows safe use of self-drilling selftapping screws because the sharp drill bit tip of the screw no longer protrudes from the remote Fig.
After about 13 weeks, the callus healing has stabilized the fracture. Strain conditions will have to be taken into account when judging whether bony bridging or non-union will occur. The stage of remodeling may take from a few months to several years. 2 Complex multifragmentary fractures tolerate more motion between the fragments than simple ones. Much of the vascular supply to the callus area derives from the surrounding soft tissue. Stimulation of callus formation seems limited and may be insufficient if too large a fracture gap persists.
Buttressing is an important technique around the metaphyseal ends of the long bones. 2). 2-14). Radiologically, only minor changes can be observed: Under absolutely stable fixation, there is minimally visible callus formation or none at all. The fact that the fragment ends are closely apposed means that there is no actual fracture gap to be seen on the x-ray (Fig. 2-15). This renders the judgement of fracture healing difficult. A gradual disappearance of the fracture gap, with trabeculae growing across it, is a good sign, while a widening of the gap may be an indirect sign of instability.