Abstract
BACKGROUND CONTEXT: Lumbar spinal fusion has been shown to result in degeneration of adjacent levels. An intervertebral disc replacement may reduce or delay the incidence of adjacent level degeneration by allowing motion at the surgical level. However, many clinical studies that have examined intervertebral disc replacements have focused on clinical pain scores and less on kinematics after implantation. Although flexion and extension of the motion segment can be measured on lateral X-rays, measuring lateral bending and rotation of the device is extremely difficult on plain radiography.
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