Spine
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Comparative Study
Degenerative changes of discs and facet joints in lumbar total disc replacement using ProDisc II: minimum two-year follow-up.
A retrospective clinical and radiologic data analysis. ⋯ After TDR using ProDisc II, the degenerative changes in the discs and facets at the adjacent segments appeared to be minimal. However, in 29.3% of the TDR segments, the facet joints presented PFA, which was more common in female, malposition of prosthesis on frontal plane, and 2-level TDR in a minimum 2-year follow-up.
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Comparative Study
Use of carboxymethylcellulose/polyethylene oxide gel in microdiscectomy with interlaminectomy: a case series comparison with long-term follow-up.
A consecutive, case series comparison. ⋯ CMC/PEO gel after microdiscectomy with interlaminectomy appears safe to use and in a 3-year follow-up significantly reduces disability and leg pain scores compared with our conventional treatment.
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Retrospective cohort analysis. ⋯ Obese patients undergoing lumbar fusion achieve similar benefits to nonobese patients. Wound-related complications are more common in obese patients. Obese patients with otherwise good indications for lumbar fusion should not be denied this procedure because of their weight.
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Comparative Study
Frequency-dependent behavior of the intervertebral disc in response to each of six degree of freedom dynamic loading: solid phase and fluid phase contributions.
Nondestructive displacement-controlled dynamic testing of cadaver material, with repeated measures design and randomized sequence of tests. ⋯ The stiffness increase and phase angle decrease with frequency were greater for deformation modes in which fluid flow effects are thought to be greater.
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Comparative Study
Quantifying the effects of degeneration and other patient factors on lumbar segmental range of motion using multivariate analysis.
Retrospective review and multivariate analysis. ⋯ The results of this study provide the clinician with insight into factors that influence segmental lumbar ROM. Age was the strongest statistical predictor of ROM and was associated with declining ROM, amounting to an approximate 3 degrees decrease in total sagittal lumbar ROM in the superior 4 segments every 10 years. BMI was another factor associated with lumbar ROM. Degeneration was a significant predictor of ROM only at L5-S1.