By Fridolin Séquin, Rigmor Texhammar (auth.)
During their twenty years of job participants of the Associa tion for the examine 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 scientific documentation has made it attainable to accomplish a superb clinical foundation for inner fixa tion. transparent definitions for the standardization of other varieties of osteosynthesis have been attainable: interfragmentary compression, splintage and buttressing in addition to combina tions of those 3 innovations. even as a scienti fic and workmanlike instrumentation used to be built. the assumption used to be to maintain diversification inside of limits yet, even though, to gather a complete choice of implants and in struments to reply to all of the difficulties provided through the com plexity of bone operations. Osteosynthesis is a tough and important operative process. Its. claims at the healthcare professional and the theatre employees are excessive. hence 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 comprehensive this activity with professional wisdom. He has prepared over a long time classes for theatre nurses and has been capable from the ensuing event to supply important feedback. whilst RIGMOR TEXHAMMAR R. N. joined AO-International 4 years in the past, it was once traditional to incorporate her as a co-author.
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Extra info for AO/ASIF Instrumentation: Manual of Use and Care
Details of Screw Design Note: the nominal length of a screw equals its total length including the head. Screw Head (Spherical Head) The large screws all have a head (8 mm diameter) with a spherical undersurface. This ensures optimum annular contact between the screw and the conical plate hole or bone, even if the screw is inserted at an angle. ) The spherical screw head was essential to the development of the dynamic compression plate (DCP). 42 I~'''-·'''~ • l ~ The hexagonal socket in the screw head - an idea that the AO borrowed from mechanics - has been in use since 1958.
Note: Tapping with the air drill is a procedure reserved for very experienced surgeons! - The cortex screw is inserted with the large screwdriver. The rounded tip of the screw should protrude about 2 mm beyond the bone so that it securely engages the opposite cortex. 2 Modified Technique If the inferior fragment ends in a narrow spike, the position of the lag screw in that fragment is critical. It is then advantageous to employ one of the following methods, in which either the gliding hole or thread hole is drilled prior to reduction.
This so-called fretting corrosion resulting from mechanical abrasion is sometimes very heavy. Stability of an internal fixation is therefore essential, not only for biomechanical reasons, but also to prevent localized corrosion of the metal. Strength of Implants The strength and dimensions of finished implants are adapted as closely as possible to biomechanical and biologic requirements. However, it is most important to be aware of the fact that an implant used for internal fixation does not act as a prosthesis.