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Two examiners who were blinded to the treatment independently conducted measurements of disk height.
Nine weeks after surgery we observed damaged or degenerated disks with proteoglycan loss and narrowing of disk height.
The intraobserver error of disk height index measurements was estimated to be minimal (within-group standard deviation (Sw) = 0.003 and coefficient of variation = 8.5%).
Our finding that some individuals have changes of facet degeneration without any changes of disk height loss is therefore consistent with the Kirkaldy-Willis view, and furthermore is supported by some earlier studies.
Although CT imaging allows excellent characterization of FJ OA and disk height loss [ 8], CT is insensitive to early changes of disk degeneration such as disk desiccation, which may be present without substantial loss of disk height.
However, a minority of individuals 10-200%, depending on the definition of anterior degeneration used) across the age spectrum exhibits a pattern of isolated posterior degeneration without substantial loss of disk height, occurring most frequently at the L5-S1 and L4-L5 spinalevelslevels
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Dimitriadis et al. [ 15] studied the effect of a one-hour period of repetitive loading on disk height.
The L5-S1 interspace was graded using a 0-3 grade scale based on reader experience, due to the fact that there is greater variability of L5-S1 disk height in relation to other spinal levels, independent of degeneration [ 24].
From Fig. 3(b), we see that the power-law index q of the disk height is almost constant, namely, about 1.1 in the inner region.
To evaluate changes in the intervertebral disk height of degenerated disks, those disk heights were normalized to the measured sham disk heights (disk height index = degenerative disk height (n = 6 /sham control disk height (n = 6).
They found that none of these factors affected disk height, but increased subject weight was associated with an increase in lumbar osteophytes.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com