By Fridolin Séquin, Rigmor Texhammar (auth.)
During their twenty years of task contributors of the Associa tion for the research of inner Fixation (AO - ASIF) have made authoritative contributions to the advance of inner and exterior fixation. The shut collaboration of surgeons, simple researchers, metallurgists, engineers and the institution of medical documentation has made it attainable to accomplish a superb medical foundation for inner fixa tion. transparent definitions for the standardization of alternative kinds of osteosynthesis have been attainable: interfragmentary compression, splintage and buttressing in addition to combina tions of those 3 ideas. even as a scienti fic and workmanlike instrumentation was once constructed. the belief used to be to maintain diversification inside of limits yet, although, to collect a accomplished choice of implants and in struments to respond to the entire difficulties awarded by way of the com plexity of bone operations. Osteosynthesis is a tough and critical operative process. Its. claims at the general practitioner and the theatre employees are excessive. accordingly plans have existed for a very long time to complement the "Manual of inner Fixation" with a de tailed description of the AO Instrumentation, its use and upkeep. Our collaborator FRIDOLIN SEQUIN, graduate engineer, has finished this activity with professional wisdom. He has equipped over a long time classes for theatre nurses and has been capable from the ensuing adventure to supply necessary feedback. whilst RIGMOR TEXHAMMAR R. N. joined AO-International 4 years in the past, it used to be common to incorporate her as a co-author.
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Extra resources for AO/ASIF Instrumentation: Manual of Use and Care
In the presence of oxygen, this layer regenerates spontaneously; therefore, small localized scratches are relatively harmless. However, it is strongly recommended that implants remain in their protective sleeves until use. Continuous destruction of this passive layer, for example, occurnng in an unstable internal fixation by movement 28 between screw head and plate, prevents repassivation and will lead to localized corrosion. This so-called fretting corrosion resulting from mechanical abrasion is sometimes very heavy.
The smooth shaft of the screw must be long enough, therefore, that it completely traverses the first fragment. In porotic bone, the screw tip should engage the opposite cortex. 5-mm Cancellous Bone Screw as a Lag Screw It is used only in the epiphysis and metaphysis. 2-mm straight drill sleeve). - The length of the hole is measured with the depth gauge for large screws. 5-mm tap (and tap sleeve, if required), a thread is cut only through the first cortex (about 10 mm deep). Exception: in very hard juvenile cancellous bone, it is recommended that the hole be tapped for its entire length.
A gliding hole is not required. The unthreaded portion of the shaft, however, must be long enough so that the threaded portion will engage only the far fragment. Principle of the lag screw: The screw must glide freely through the near fragment and engage only the opposite fragment. 20 / Remarks (cf. p. 24) If the fragments are small, a single screw can produce sufficient interfragmental compression for undisturbed bone healing. However, the resulting stability is inadequate to withstand heavy external loads, since these may cause the fragments to rotate about the screws as an axis.