Spine
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Comparative Study
Active lifestyle protects against incident low back pain in seniors: a population-based 2-year prospective study of 1387 Danish twins aged 70-100 years.
Prospective cohort study of twins. ⋯ Strenuous physical activity at least once a week is protective for incident LBP in seniors.
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Comparative Study
Q89R polymorphism in the LDL receptor-related protein 5 gene is associated with spinal osteoarthritis in postmenopausal Japanese women.
An association study investigating the genetic etiology for spinal osteoarthritis. ⋯ We suggest that a genetic variation at the LRP5 gene locus is associated with spinal osteoarthritis, in line with the involvement of the LRP5 gene in the bone and cartilage metabolism.
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Comparative Study
Biomechanical evaluation of the Total Facet Arthroplasty System: 3-dimensional kinematics.
An in vitro biomechanical study to quantify 3-dimensional kinematics of the lumbar spine following facet arthroplasty. ⋯ The TFAS allowed considerable motion in all directions tested, with ROM being less than the intact in flexion and lateral bending, and greater than the intact in axial rotation. The helical axis of motion with the TFAS was not different from intact in flexion-extension and lateral bending, but it was shifted anteriorly in axial rotation. The kinematics of the TFAS were more similar to the intact spine than were the kinematics of the posterior fixation when applied to a destabilized lumbar spine.
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Comparative Study
Is it safer to place pedicle screws in the lower thoracic spine than in the upper lumbar spine?
An anatomic study of 100 patients comparing the pedicle isthmic width of the lower thoracic spine and the upper lumbar spine using magnetic resonance imaging. ⋯ The results show that the lower thoracic pedicles are larger than the upper lumbar pedicles. This may make it safer to place screws in the lower thoracic spine than in the upper lumbar spine. Upper lumbar may be so small (<5 mm) to preclude safe conventional screw placement.
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Comparative Study
Factors of thoracic cage deformity that affect pulmonary function in adolescent idiopathic thoracic scoliosis.
This clinical study examined the association between pulmonary function and thoracic cage deformities in scoliosis. ⋯ The factors that reduced %VC were the sagittal diameter of the thoracic cage, total lung area and vertebral rotation at the T8 and T9 levels.