Fluoroscopic assessment of lumbar total disc replacement kinematics during walking

Barrett, Rod S., Lichtwark, Glen A., Armstrong, Codie, Barber, Lee, Scott-Young, Matthew and Hall, Richard M. (2015) Fluoroscopic assessment of lumbar total disc replacement kinematics during walking. Spine, 40 7: 436-442. doi:10.1097/BRS.0000000000000787


Author Barrett, Rod S.
Lichtwark, Glen A.
Armstrong, Codie
Barber, Lee
Scott-Young, Matthew
Hall, Richard M.
Title Fluoroscopic assessment of lumbar total disc replacement kinematics during walking
Journal name Spine   Check publisher's open access policy
ISSN 1528-1159
0362-2436
Publication date 2015-04-01
Sub-type Article (original research)
DOI 10.1097/BRS.0000000000000787
Volume 40
Issue 7
Start page 436
End page 442
Total pages 7
Place of publication Philadelphia, PA, United States
Publisher Lippincott Williams and Wilkins
Collection year 2016
Language eng
Formatted abstract
Study Design. Descriptive.
Objective. The purpose of this study was to determine the in vivo kinematics of functional spinal units, during gait, in individuals with a single-level lumbar total disc replacement (TDR).
Summary of Background Data. TDR is a motion preservation technology that offers an alternative to spinal fusion for treatment of degenerative disc disease. The aim of TDRs is to replicate motion of the functional spinal units, which may protect adjacent intervertebral discs against accelerated degeneration. At present, there is limited understanding of the in vivo motion of TDRs, particularly during dynamic activities such as gait. Such information is important for understanding the wear characteristics of TDRs and furthering design rationale of future implants.
Methods. TDR motions were obtained from 24 participants who underwent implantation with single-level L4–L5 or L5–S1 CHARITÉ or In Motion TDRs. Video fluoroscopy was used to obtain measurements in the frontal and sagittal planes during fixed speed treadmill walking.
Results. The mean range of motion between the upper and lower lumbar TDR endplates during walking was 1.6° and 2.4° in the frontal and sagittal planes, respectively. These values were significantly different from zero and corresponded to 19% of the maximum static range of motion in each plane.
Conclusion. Lumbar TDRs provide a degree of motion preservation at the operative level during moderate speed walking. The distribution of lumbar TDR motions during walking presented here will inform relevant standards for conducting standardized tests of lumbar TDRs, particularly wear assessments, and, hence, enable more realistic mechanical and computer-based wear simulations to be performed.
Level of Evidence: N/A
Keyword CHARITÉ
In Motion
Artificial disc
Gait
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2016 Collection
School of Human Movement and Nutrition Sciences Publications
School of Medicine Publications
 
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