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KMID : 0357220000120030455
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Journal of Korean Society Physical Therapy
2000 Volume.12 No. 3 p.455 ~ p.468
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Effects of Disc Degeneration on Biomechanical Behaviors of the Intevertebral Disc
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이현옥/Lee, Hyun-Ok
이성재/신정욱/신태진/Lee, Sung-Jae/Shin, Jung-Woog/Shin, Tae-Jin
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Abstract
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The purpose of this study was to analyze the effects of disc degeneration on the biomechanical behaviors of
the intervertebral disc in term of axial displacement, intradiscal pressure, disc bulge at the L4-L5-functional ,spinal unit(FSU). The degeneration is divided 4 grade by initial intradiscal pressure: normal: 135kPa, mild:
I07kPa. moderate: 47kPa, severe: 15kPa,
The predicted results were follows:
1. The magnitude of the bulge is found to be maximum at the anterior, minimum at the postero-lateral portion. The bulge of lateral, postero-lateral is found to´ be maximum in severe grade, followed by moderate, mild, normal grade.
2.The displacement was increased with increasing compressive load in all four grades. The stiffness of disc was found to be reduced by progressing from normal to severe grade.
3.The intradiscal pressure was increased nearly linearly with increasing compressive load in normal and mild grade. But the increasing rate in moderate and severe grade was showed apparently different from normal and mild grade. Specially, it was increased very slightly in severe grade.
In conclusion, decreased intradiscal pressure resulted in increase of axial displacement and disc bulge with compressive load increasing, these may compromise the nerve root impingement or irritation. Therefore posture and activities must be focus to reduce compressive load applied on the back or disc.
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