THE STRUCTURE OF THE PARS INTERARTICULARIS OF THE LOWER LUMBAR VERTEBRAE AND ITS RELATION TO THE ETIOLOGY OF SPONDYLOLYSIS

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  • With a Report of a Healing Fracture in the Neural Arch of a Fourth Lumbar Vertebra

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<jats:p> 1. An anatomical study of the bony structure of the pars interarticularis of the fourth and fifth lumbar vertebrae has been made in specimens from seven cadavers aged seventeen to sixty-seven. </jats:p><jats:p> 2. Layers of cortical bone have been described antero-laterally and postero-medially which are thickest in the narrowest region of the pars. </jats:p><jats:p> 3. In one specimen from a seventeen-year-old male, a healing fracture was found in the antero-lateral layer of cortical bone in the right neural arch of the fourth lumbar vertebra. </jats:p><jats:p> 4. The stresses to which the pars is subject consist primarily of shear forces applied to the articular processes. The significance of these stresses to the etiology of spondylolysis is discussed. </jats:p>

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