Lumbar spine mechanical response to axial compression load in vivo.

Abstract:

STUDY DESIGN:Lumbar spine kinematic response to a 1.0 body weight compressive load was measured in vivo by comparison of relaxed and loaded magnetic resonance image sets in the sagittal plane. OBJECTIVES:To identify and measure acute response mechanisms of the lumbar spine during compression loading. SUMMARY OF BACKGROUND DATA:The isolated ligamentous spine buckles under small loads (88 N); yet, the spine supports >10 times that load in daily activities. Mechanical function of the lumbar spine in vivo is not well understood, and only a few studies examined the spine during in vivo loading. METHODS:Magnetic resonance imaging scans of subjects were taken while subjects were relaxed and while supporting a 1.0 body weight compressive load. Vertebral bodies and disc perimeters were digitized, and relative centroid positions were measured and compared between conditions. Lumbar rotation, bending, compression, and disc translation were determined. Two parameter ensembles were analyzed to describe mechanisms of "spine shrinkage" (decrease of projected spine length) and lumbosacral response. RESULTS:All subjects underwent spine shrinkage (-3.9 +/- 1.2 mm) dominated by cumulative bending, except in three subjects where the rotation component dominated. Levels L2-L4 extended, while L5 flexed, and dL2 through dL4 translated anterior, while dL5 translated posterior. Significant segmental deformations were as follows: L3 extension (-3.3 +/- 3.1 degrees ), dL5 disc translation (-1.4 +/- 1.4 mm), and posterior sacral rotation (3.2 +/- 4.7 degrees ). CONCLUSIONS:Spine shrinkage occurred mainly from spine bending and rotation, with only small contribution from spine compression (shortening along the spine curvature). Response pattern groupings indicated at least two unique subgroups, but the cause remains to be determined.

journal_name

Spine (Phila Pa 1976)

journal_title

Spine

authors

Wisleder D,Smith MB,Mosher TJ,Zatsiorsky V

doi

10.1097/00007632-200109150-00004

keywords:

subject

Has Abstract

pub_date

2001-09-15 00:00:00

pages

E403-9

issue

18

eissn

0362-2436

issn

1528-1159

journal_volume

26

pub_type

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