Scott A. Yerby

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How evolutionary changes in body size are brought about by variance in developmental timing and/or growth rates (also known as heterochrony) is a topic of considerable interest in evolutionary biology. In particular, extreme size change leading to gigantism occurred within the dinosaurs on multiple occasions. Whether this change was brought about by(More)
OBJECTIVE To determine whether the human Achilles tendon has higher material properties than other tendons and to test for strain rate sensitivity of the tendon. DESIGN Mechanical testing of excised tendons. BACKGROUND While the human Achilles tendon appears to experience higher in vivo stresses than other tendons, it is not known how the Achilles(More)
STUDY DESIGN The spinal canal and neural foramina dimensions of cadaver lumbar spines were quantified during flexion and extension using magnetic resonance imaging before and after placement of an interspinous process implant. OBJECTIVE To quantify the effect of the implant on the dimensions of the spinal canal and neural foramina during flexion and(More)
STUDY DESIGN Measurement of the kinematics of the lumbar spine after insertion of an interspinous spacer in vitro. OBJECTIVES To understand the kinematics of the instrumented and adjacent levels due to the insertion of this interspinous implant. SUMMARY OF BACKGROUND DATA An interspinous spacer (X Stop, SFMT, Concord, California) has been developed to(More)
STUDY DESIGN Facet loading parameters of lumbar cadaver spines were measured during extension before and after placement of an interspinous process implant. OBJECTIVE The study was undertaken to quantify the influence of an interspinous implant on facet loading at the implanted and adjacent levels during extension. SUMMARY OF BACKGROUND DATA Facet(More)
STUDY DESIGN Measurement of intradiscal pressure was performed after placement of an interspinous implant in a cadaver model. OBJECTIVE To understand the likelihood of accelerated adjacent-level disc degeneration as a result of the implant. SUMMARY OF BACKGROUND DATA An interspinous implant has been developed to treat lumbar neurogenic claudication(More)
STUDY DESIGN A biomechanical study on the stabilization of thoracolumbar burst fractures. OBJECTIVE To demonstrate that the addition of a calcium phosphate cement into the fractured vertebral body through a transpedicular approach is a feasible technique that improves the stiffness of a transpedicular screw construct. SUMMARY OF BACKGROUND DATA Short(More)
STUDY DESIGN A high-resolution strain measurement technique was applied to axially loaded parasagittal sections from thoracic spinal segments. OBJECTIVES To establish a new experimental technique, develop data analysis procedures, characterize intrasample shear strain distributions, and measure intersample variability within a group of morphologically(More)
An interspinous process implant has been developed to treat patients suffering from neurogenic intermittent claudication secondary to lumbar spinal stenosis. As most patients who suffer from spinal stenosis are over the age of 50 and may have weaker bones, it is imperative to know how bone mineral density (BMD) correlates with lateral spinous process(More)