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Obtuse-angled Laminotomy as a Modification of Multilevel Laminectomy for Spinal Cord Decompression.
Clinical Spine Surgery 2016 March
The purpose of this note is to describe an obtuse-angled laminotomy of C7 during cervical decompression that aims to preserve cervicothoracic junction stability and potentially reduce pain. Cervical spondylotic myelopathy can result from degenerative cervical spinal disease including, herniated disk material, osteophytes, redundant ligamentum flavum, or ossification of the posterior longitudinal ligament. Surgical intervention for multilevel myelopathy aims to decompress the spinal cord and maintain stability of the cervical spine. Multilevel laminectomy is traditionally used when degenerative changes affect 3 or more levels and when there is primarily dorsal compressive disease. Traditional laminectomy can result in instability and kyphosis. The C7 lamina can be particularly vulnerable given the location at cervicothoracic junction. We describe an obtuse-angled laminotomy for the most caudal lamina in a planned decompression. This lamina is left attached to ligamentum nuchea, adjacent fascia, and paravertebral muscles. Only the base of spinous process and ventral portion of lamina's cortical and cancellous bone are removed in an obtuse angle through the opening. This variation is aimed to preserve as much of the cervical stability while still achieving the goal of decompression.
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