By Fridolin Séquin, Rigmor Texhammar (auth.)
ISBN-10: 364296592X
ISBN-13: 9783642965920
ISBN-10: 3642965946
ISBN-13: 9783642965944
During their two decades of job participants of the Associa tion for the learn of inner Fixation (AO - ASIF) have made authoritative contributions to the improvement of inner and exterior fixation. The shut collaboration of surgeons, easy researchers, metallurgists, engineers and the institution of medical documentation has made it attainable to accomplish a great clinical foundation for inner fixa tion. transparent definitions for the standardization of alternative forms of osteosynthesis have been attainable: interfragmentary compression, splintage and buttressing in addition to combina tions of those 3 suggestions. while a scienti fic and workmanlike instrumentation used to be constructed. the belief was once to maintain diversification inside limits yet, notwithstanding, to collect a accomplished selection of implants and in struments to respond to the entire difficulties awarded through the com plexity of bone operations. Osteosynthesis is a tough and critical operative technique. Its. claims at the general practitioner and the theatre employees are excessive. as a result 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 entire this activity with specialist wisdom. He has equipped over decades 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 usual to incorporate her as a co-author.
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Additional resources for AO/ASIF Instrumentation: Manual of Use and Care
Example text
The overbent plate acts like a leaf spring, causing compression to be exerted on the opposite cortex as well. If the plate is not overbent, only the cortex near the plate is compressed, and there is a danger that the opposite cortex will gape. ' II " U I When a "compression plate" is used, it is often unclear whether its action is static or dynamic, since there is not always a clear dividing line between the two. Whenever possible, plates should be used according to the tension band principle (see below), thereby utilizing the additional stabilizing effect of dynamic compression.
They are used as lag screws (individually or through plates) to draw bone fragments together, or they are used for the fixation ofplates. There are two basic types of screw design, each of which has its own specific applications. Cortex Screws Cortex screws are fully threaded. They are designed for use in the hard cortical bone of the diaphysis. Their full threading makes them easy to remove from the bone, even if they are closely invested by new bone growth. Cancellous Bone Screws and Malleolar Screws These screws are only partially threaded, the rest of the shaft being smooth.
Mall. 4,5 - 4,5 4,5 4,5 3,2 (4,5) Canc. 2 Use of Screws as Lag Screws (static interfragmental compression) Principle of the lag screw: the screw glides freely through the fragment adjacent to the screw head and engages only the opposite fragment. The operative technique is essentially different for cortex screws (fully threaded) and for cancellous bone and malleolar screws (partially threaded) and will therefore be discussed separately for the different screw types. :~ ' .. " .... ~ To permit the cortex screw to glide freely through the near fragment, a gliding hole is drilled through the near cortex, which is equal to the thread diameter.
AO/ASIF Instrumentation: Manual of Use and Care by Fridolin Séquin, Rigmor Texhammar (auth.)
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