Spine
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Comparative Study
Kinematics of the cervical spine in lateral bending: in vivo three-dimensional analysis.
Kinematics of the cervical spine during lateral bending were investigated using a novel system of three-dimensional motion analysis. ⋯ We succeeded in identifying in vivo coupled motions of the cervical spine in lateral bending for the first time.
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Comparative Study
Mechanical stiffness of segmental versus nonsegmental pedicle screw constructs: the effect of cross-links.
A biomechanical study in porcine spines of the construct stiffness effects of segmental pedicle screws. Stiffness effects of supplementation of nonsegmental screw constructs with cross-links was also evaluated. ⋯ Segmental pedicle screw constructs increased mechanical stiffness compared to nonsegmental constructs in our fusion models. Placement of a single cross-link with nonsegmental screws eliminated statistical differences for 3 and 4-vertebral level constructs, and may be a satisfactory alternative in this clinical setting. Caution in applying these results inlonger constructs is recommended, given persistent increased stiffness found for the segmental 5-vertebral level models.
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Validation of a translated, culturally adapted questionnaire. ⋯ The Spanish version of the FABQ has good comprehensibility, internal consistency, and reliability. It cannot be analyzed parametrically, but only nonparametrically. The total FABQ is at least as valid as its subscales and simpler to score, making it more suitable for routine clinical use.