By Univ.-Prof. Dr. med. habil. Reiner Labitzke (auth.)
In bone surgical procedure it really is necessary to compress fractures interfragmentarily so that it will cause them to proof against the tensile strength of muscle tissue and the strength caused by acceleration and deceleration. this is top accomplished by way of cable rigidity bands as a traction mechanism. The cable stress band is - by way of balance of fractures - some distance enhanced to the normal inflexible cerclage cord which has been universal in osteosynthesis for over a hundred years. the writer explains the biomechanics of the stress band intimately. Theoretical findings are proven via scientific try out effects. All osteosynthetic ideas which might be conducted with cables are defined giving information of operation directions. mistakes and hazards are continuously mentioned. A reference booklet and operative guide at a time.
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Additional resources for Manual of Cable Osteosyntheses: History, Technical Basis, Biomechanics of the Tension Band Principle, and Instructions for Operation
2. This elastic limit is a common value in engineering that marks the end of Hooke's line describing the end of the elastic phase. It is distinguished by the fact that the sample springs back to its original length after removal of the load. This is the significant quality feature of every traction-loaded implant. 2%) the wire cables and the cerclage wires undergo irreversible plastic deformation. ) The length of Hooke's line shows the elastic force reserve with which an osteosynthesis can be made taut.
38. A screw tightens particularly effectively if it is placed in the direction of strain; note the bent Kirschner wires. Screwed in convergently with the direction of tension, it leads - upon tightening - to a decrease in tension because the distance between the fixation points will reduce • Squeezing without contact being made between the force-limiting knobs is insufficient because only partial pressure is produced at the jaws of the pliers - cf. Fig. 21. • The crimp must not project from one side of the jaws of the pliers because it would then only be squeezed partially.
But as any Xray will show, cerclage wire cannot be placed between two points without deviation; it is much too stiff. Therefore a kink can only pass on the force of tension as long as it persists. The force sufficient to stretch it therefore results in the immediate drop of initially attainable pre-tension and finally leads to a loosening of the osteosynthesis (Joo]. Reproducible results were not attainable in this part of the trial, as the kinks already lengthened with very small tensions. Even if the elongation is only minimal ilnd is hardly or not at all detectable radiologically, this may be a fundamental explanation for the uniting of the fragments, as a rule without tension, in other words merely an adaptation, the inherent contradiction of wire tension banding.