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Home  >  Volume 35

The Effect of Angular Coupling on the Stability of the Lumbar Spine and the Associated Risk of Injury Using Analytic Theory: A New Biomechanical Technique by M.M. Izam,B.U.A. Abozeh, M.Y. Mafuyai, Y.Y. Jabil and B.F. Masok (pages 215-225)
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Angular coupling is intrinsic biological property of the lumbar spine whose effect on the question of the lumbar spine’s stability/instability has been very difficult to study. This work proposed and applied a new theory that is dependent on the equation of the lumbar spine in six degrees-of-freedom to study the effect of angular coupling on the stability of lumbar spine and, consequently, on low back pain. We derived the equation of the lumbar spine in six degrees-of-freedom and applied it to study the effects of 2°,4° and 8°lateral bending, axial twist and both lateral bending and axial twist on the 10°extension of a hypothetical lumbar spine. The results of the work show that angular coupling from lateral bending of up to 8° has no significant effect on the lumbar spine. The axial twist shows no significant changes at 2° and 4° but visibly affects the lumbar spine at 8°. The combined effect of lateral bending and axial twist shows insignificant differences from the effect of axial twist alone, suggesting that the contribution of axial twist to the combined effect is greater. Additionally, the work reveals the possibility of torque transfer from the upper joints of the lumbar spine to the lower joints (L 4-5 and L5 /S 1 ).We concluded that angular coupling from axial twist of up to 8°can cause instability of the lumbar spine and increase the risk of injury to the lumbar spine. Areas for further research using this technique have been suggested.

Keywords:Lumbar spine, Angular coupling, Degree-of-freedom, Risk of injury, Torque transfer.