Quantification of continuous in vivo flexion-extension kinematics and intervertebral strains.

Autor: Nagel TM; Department of Mechanical Engineering, University of Minnesota, 111 Church Street S.E., ME 1100, Minneapolis, 55455, USA., Zitnay JL, Barocas VH, Nuckley DJ
Jazyk: angličtina
Zdroj: 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 [Eur Spine J] 2014 Apr; Vol. 23 (4), pp. 754-61. Date of Electronic Publication: 2014 Feb 02.
DOI: 10.1007/s00586-014-3195-0
Abstrakt: Purpose: Healthy subjects performed lumbar flexion and were assessed by video fluoroscopy to measure the in vivo kinematics of the lower lumbar motion segments.
Methods: Fifteen healthy subjects (8 male, 7 female, 28 ± 10 years) performed lumbar flexion and extension back to neutral while their vertebrae were imaged. The sagittal plane vertebral margins of L3-S1 were identified. Lumbar angle, segmental margin strains, axial displacements, anterior-posterior (A-P) translations, and segmental rotations over the course of flexion were measured.
Results: L4-L5 had the largest posterior margin Green strain (65%). Each segment displayed more axial displacement than A-P translation. Peak vertebral angulation occurred at approximately 75% of peak flexion during the extension phase.
Conclusion: L4-L5 exhibited the largest anterior and posterior margin strains (29 and 65%, respectively). Strains in the disc during in vivo lumbar flexion are due to both angular rotation and linear translation.
Databáze: MEDLINE
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