The Journal of Bone and Joint Surgery (American). 2008;90:656-671.
© 2008 The Journal of Bone and Joint Surgery, Inc.
Spondylolisthesis and Spondylolysis
Serena S. Hu, MD1,
Clifford B. Tribus, MD2,
Mohammad Diab, MD1 and
Alexander J. Ghanayem, MD3
1 Department of Orthopaedic Surgery, University of California, San Francisco, 500 Parnassus Avenue, Room MU 320W, San Francisco, CA 94143
2 Department of Orthopedic Surgery and Rehabilitative Medicine, University of Wisconsin, K4/746 Clinical Science Center, 600 Highland Avenue, Madison, WI 53792
3 Department of Orthopaedic Surgery and Rehabilitation, Loyola University Chicago, 2160 South 1st Avenue, Maywood, IL 60153
An Instructional Course Lecture, American Academy of Orthopaedic Surgeons
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Introduction
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The term "spondylolisthesis" refers to slipping, or olisthesis, of a vertebra ("spondylos" in Greek) relative to an adjacent vertebra. The term "spondylolysis" refers to dissolution of, or a defect in, the pars interarticularis of a vertebra. To these original terms has been added "spondyloptosis," from the Greek "ptosis" (falling off or down) to indicate a vertebra that is completely or essentially completely dislocated.
There are five types of spondylolisthesis: dysplastic, isthmic, degenerative, traumatic, and pathologic1. In the dysplastic type, facet joints allow anterior translation of one vertebra on another. Because the neural arch of the olisthetic vertebra is intact, it can compress the cauda equina as it translates. This type accounts for the only reported case of spondylolisthesis at birth2. "Isthmic" is from the Greek, meaning narrow. The isthmic type involves a lesion of the pars interarticularis (the narrow part of bone between the superior and inferior articular . . . [Full Text of this Article]

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