Journal of the Korean Society for Precision Engineering (한국정밀공학회지)

Korean Society for Precision Engineering (한국정밀공학회)
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Effects of Abdominal Muscle and Pressure on the Spine Stability during Upright Stance Posture - For the Case where Intervertebral Disc Plays the Role of Mechanoreceptor

추간판이 물리적 자극의 수용기 역할을 하는 경우 기립 상태에서 복압 및 복근의 역할이 척추 안전성에 미치는 영향

  • Choi, Hae-Won (Graduate School, Department of Mechanical Engineering, Dankook Univ.) ;
  • Kim, Young-Eun (Department of Mechanical Engineering, Dankook Univ.)
  • 최혜원 (단국대학교 기계공학과 대학원) ;
  • 김영은 (단국대학교 기계공학과)
  • Received : 2010.09.16
  • Accepted : 2010.11.09
  • Published : 2011.01.01
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Abstract

Recently, we have proposed a hypothesis that spinal structures have a stress sensor driving feedback mechanism, In the human spine, spinal structure could react to modify muscular action in such a way so as to equalize stress at the disc, therefore reduce the risk of injury, In this analysis, abdominal muscle and abdominal pressure, which were not included in the previous study, were added to identify those effects in spine stability during upright stance posture for the case where the intervertebral disc plays the role of mechanoreceptor, The musculoskeletal FE model was consisted with detailed whole lumbar spine, pelvis, sacrum, coccyx and simplified trunk model. Muscle architecture with 46 local muscles containing paraspinal muscle and 6 rectus abdominal muscles were assigned according to the acting directions. The magnitude of 4kPa was considered for abdominal pressure. Minimization of the nucleus pressure deviation and annulus fiber average tension stress deviation was chosen for cost function. Developed model provide nice coincidence with in-vivo measurement (nucleus pressure). Analysis was conducted according to existence of co-activation of abdominal muscle and abdominal pressure. Antagonistic activity of abdominal muscle produced stability of spinal column with relatively small amount of total muscle force. In contrast to the abdominal muscle, effect of abdominal pressure was not clear that was partly depending on the assumption of constant abdominal pressure.

Keywords

References

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