Eisenstein S
J Bone Joint Surg Br. 1978 Nov;60-B(4):488-94. doi: 10.1302/0301-620X.60B4.361744.
The lumbar spines of 485 skeletons of adult South African "Whites" and "Blacks" of both sexes were examined to determine the incidence and morphology of defects in the pars interarticularis. The overall incidence was 3.5%, without significant variation between races and sexes. The incidence of lumbar spina bifida in the whole sample was 1.9%, but was 11.8% in those skeletons with spondylolysis. Some instances of unilateral spondylolysis demonstrated obvious callus formation, suggesting a capability for normal repair. It is possible that the defects in bilateral cases represent established non-union of fractures of the pars interarticularis resulting from excessive mobility, and are not due to dysplasia of bone. It is noted, for the first time, that the superior facets of affected vertebrae are abnormally enlarged, and that the inferior facets of the separate neural arch are characteristically elliptical.
对485具成年南非“白人”和“黑人”男女骨骼的腰椎进行了检查，以确定关节突间部缺损的发生率和形态。总体发生率为3.5%，种族和性别之间无显著差异。整个样本中腰椎脊柱裂的发生率为1.9%，但在有椎弓根峡部裂的骨骼中为11.8%。一些单侧椎弓根峡部裂病例显示出明显的骨痂形成，提示有正常修复的能力。双侧病例中的缺损可能代表由于过度活动导致的关节突间部骨折已形成的不愈合，而非骨质发育异常。首次注意到，受累椎体的上关节突异常增大，而分离神经弓的下关节突呈典型的椭圆形。
