By Fridolin Séquin, Rigmor Texhammar (auth.)
During their twenty years of task 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, uncomplicated researchers, metallurgists, engineers and the institution of scientific documentation has made it attainable to accomplish an exceptional clinical foundation for inner fixa tion. transparent definitions for the standardization of other kinds of osteosynthesis have been attainable: interfragmentary compression, splintage and buttressing in addition to combina tions of those 3 thoughts. whilst a scienti fic and workmanlike instrumentation was once constructed. the belief was once to maintain diversification inside of limits yet, in spite of the fact that, to collect a accomplished number of implants and in struments to reply to all of the difficulties provided via the com plexity of bone operations. Osteosynthesis is a tough and important operative procedure. Its. claims at the doctor and the theatre employees are excessive. consequently 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 complete this job with specialist wisdom. He has equipped over a long time classes for theatre nurses and has been capable from the ensuing event to supply valuable feedback. while RIGMOR TEXHAMMAR R. N. joined AO-International 4 years in the past, it was once ordinary to incorporate her as a co-author.
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Extra resources for AO/ASIF Instrumentation: Manual of Use and Care
1 Basic Instrument Set The basic instrument set is a red case containing all standard instruments for fixation with large screws and plates. S-mm cancellous bone screws. S-mm cortex screw is used as a lag screw. S-mm screw shaft and to prevent splitting. The drill bits in the standard sets are all designed for qUickcoupling to the small air drill. Bits with a triangular base for clamping in a Jacobs chuck are available on request. ). o = 0 <~7 The drill bit should be stationary (not rotating) when introduced into the drill sleeve.
Their tip is designed to cut its own thread in cancellous bone; tapping is seldom necessary. 2 mm dia. 5 mm dia. 4 Washers Washers are used with cancellous bone and malleolar screws to prevent the screw head from sinking into the thin cortex. The flat side faces the bone, while the countersunk side goes beneath the screw head. 5-mm cortex screws, but should be used only in rare emergencies (see p. 50). 6 Screw - Drill Bit - Tap The following are required for the insertion of a lag screw: Large screws Large Hexagonal Socket Type of screw + Diameter Drill Bit for Gliding Hole = Outside Diameter Drill Bit for Threaded Hole Tap = Outsfde Diameter 46 Cort.
Since 1958, AO orthopedic and general surgeons who perform internal fixations as a matter of routine have worked on the development of these instruments. Constant reevaluation of existing AO instruments and implants by the Technical Committee ensures continued improvements and innovations. Imitations of AO instruments, which are sold by nearly all major manufacturers of surgical instruments, have contributed greatly to the dissemination of AO methods. However, it must be understood that the AO and SYNTHES I have no connection with the manufacture of these products and hence assume no responsibility for their quality.