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Medicina Fluminensis : Medicina Fluminensis, Vol. 47 No. 2, 2011.

Review article

Biomechanical analysis of lumbar spine movement

Boris Božić ; Clinics for neurosurgery, CHC Sisters of mercy, Zagreb
Krešimir Rotim ; Clinics for neurosurgery, CHC Sisters of mercy, Zagreb
Tomislav Sajko ; Clinics for neurosurgery, CHC Sisters of mercy, Zagreb
Marta Borić ; Clinics for neurosurgery, CHC Sisters of mercy, Zagreb

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Abstract

In this mini-review we present the results of our researches on biomechanical
analysis of lumbar spine movement. We have applied static load, centrically as well as excentrically,
to the expanded vertebral dynamic segment of the lumbar spine, which includes
the second, the third and the fourth lumbar vertebra with accompanying discs and ligaments.
The effects of static load were expressed as angular displacements of vertebraeand
recorded as laser beam deviations on the recording screen. We have demonstrated and
quantified the slant or relative shifts of lumbar vertebrae; indicating that the “physiological
instability” of the lumbar spine really exists. The existance of this phenomenon was hypothesized
in the existing literature, but was never thoroughly investigated. Furthermore, we
have quantified possible increases in instability of the lumbar spineas a consequence of different
neurosurgical procedures. On the basis of the obtained results, we concluded that
the interlaminectomy causes no significant increase in lumbar spine instability, while hemilaminaectomy
and especially laminaectomy causes the substantial increase in instability of
the lumbar spine. Frontal disc hernia of the lumbar spine regularly appears as a consequence
of extensive neurosurgery (especially after laminaectomy).
The interlaminaectomy is the method of choice in treatment of disc hernias of the lumbar
spine; furthermore, the stabilization of lumabr vertebrae by means of transpeduncular fixation
or the implantation of an artificial disc is indicated after extensive operations, such as
laminaectomy.

Keywords

biomechanic; spine; operations

Hrčak ID:

70134

URI

https://hrcak.srce.hr/70134

Publication date:

1.6.2011.

Article data in other languages: croatian

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