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Journal of Korean Neurosurgical Society 1993;22(1): 63-70.
Y-Angle Stenosis of Lumbar Spine: New Concept of Lumbar Stenosis.
Young Soo Kim, Yong Eun Cho, Hyung Chun Park, Doh Heum Yoon, Sung Woo Roh
Department of Neurosurgery, Yonsei University College of Medicine, Seoul, Korea.
Authors measured the Y-shaped angle made by both yellow ligaments and both laminae named Y-angle at the spinal CT scan in normal and lumbar stenosis group. The normal range of Y-angle is between 60 degrees and 95 degrees. Lumbar stenosis is classified into narrow Y-angle stenosis(<60 degrees) and wide Y-angle stenosis(>95 degrees) by Y-angle. Narrow Y-angle stenosis is most common in degenerative spondylotic stenosis. Wide Y-angle is most common in congenital stenosis. The Y-angle is a simple and useful diagnostic indicator in the diagnosis of lumbar spinal stenosis on CT scan and MRI scan.
Key Words: Lumbar stenosis; Y-angle; Narrow Y-angle stenosis; Wide Y-angle stenosis
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