ISSN:
1013-9826
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Dynamic stabilization of the lumbar spine has gained increasingly popularity. Thesenonfusion systems are alleged to maintain or restore the intradiscal pressure to magnitudes of theintact spine and have little negative effect on the adjacent segments to the stabilized one. CompliantNitinol alloy (Ni-Ti) has been used in the manufacture of the rods of the dynamic stabilizationsystems. In this study, we investigated a dynamic stabilization system with its coiled rods made ofNitinol alloy. Four porcine lumbar spines (T12-L6) were prepared: intact, fixed by a conventionalrigid fixation system, fixed by a dynamic stabilization system with 2-coiled rods, fixed by adynamic stabilization system with 3-coiled rods. Intradiscal pressures were measured at all levelsbefore and after insertion of the implant. Our results show that the rigid stabilization system resultedin great changes of disc pressure in flexion and extension regardless of spinal levels. However,Intradiscal pressures (IDPs) remained relatively unchanged in models fixed by the dynamicstabilization systems. Changes in intradiscal pressure can lead to altered metabolism within the disc,with potential long-term disc degeneration. These results suggest that the dynamic stabilizationsystems are superior over traditional fusion implants in maintaining the intradiscal pressure to theintact level at surgical level and adjacent level and can therefore be considered as an alternativemethod to fusion surgery in these indications while the intradical pressure is preserved
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/01/54/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.342-343.913.pdf
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