Spine
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A retrospective review of lumbar total disc replacement (TDR) radiographs. ⋯ To be 95% certain that an implanted TDR prosthesis has any sagittal motion, a ROM of at least 4.6 degrees must be observed, which is the upper limit of intraobserver measurement variability for a TDR with a true ROM of 0 degrees. To be 95% certain that a change in TDR ROM has occurred between 2 measurements by the same observer, a change in ROM of at least 9.6 degrees must be observed (the entire range of +/-4.6 degrees intraobserver variability). ROM measurement variability should be considered when evaluating the success or failure of motion preservation in lumbar TDR.
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This is a report of a 12-year-old girl treated surgically for scoliosis associated with bilateral hip dislocation in Larsen syndrome. ⋯ A case of scoliosis associated with dislocated hips in a patient with Larsen syndrome was successfully treated with posterior correction surgery. Fusion surgery between T4 and L2 provided an ideal sagittal balance of the total spine, while preserving 4 lumbar mobile segments.