A dynamic approach to spinal instability. Part II: Hesitation and giving-way during interspinal motion

Spine
M OgonM H Pope

Abstract

Human lumbar functional spinal units (FSUs) were moved throughout their range of motion in sagittal and lateral bending, while the dynamics of this movement were computed in vitro. Functional spinal units were tested intact and after subsequent discectomy and unilateral facetectomy. To determine whether the patterns of small jerks observed during intersegmental motion are sensitive to spinal instability. Small jerks have been observed as hesitation during increasing velocity and as giving way during decreasing velocity in the experiments described in Part I of this study. Human lumbar functional spinal units were moved from extension to flexion, flexion to extension, left to right, and right to left, by a pure moment. Range of motion and velocity and acceleration patterns of the main and coupled motions were evaluated in six degrees of freedom by position changes of attached infrared light-emitting diodes recorded by cameras. Functional spinal units were tested in three surgical conditions (intact, discectomy, and unilateral facetectomy) under two preload conditions (no preload and 400-N preload). Discontinuous accelerations and decelerations (jerks) were computed in these motions and their location in relation to the main angu...Continue Reading

Citations

Nov 21, 2018·The Journal of Manual & Manipulative Therapy·Richard Yarznbowicz, Minjing Tao
Jul 28, 2005·European Spine Journal : Official Publication of the European Spine Society, the European Spinal Deformity Society, and the European Section of the Cervical Spine Research Society·Julie M FritzJohn D Childs
Nov 1, 2003·The Spine Journal : Official Journal of the North American Spine Society·J J Triano

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