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This monograph is of manifest value as a roentgenologic study of lesions of the vertebral column. Spondylolysis is defined as a dissolution of continuity of the posterior vertebral arch between the superior and inferior articular facets. The "lysis" may traverse the base of the arch as it approaches the facet; the authors call this the intra-articular isthmus, often involved in spina bifida. In a comprehensive review of the literature, important developments are noted. The Eskimo race is apparently exempt from low back lesions. Willis and Schmorl microscopically found inclusions of cartilaginous islands at the base of the posterior arches in cases in which premature arrest of enchondral ossification led to incomplete bony fusion. The causes considered adequate to produce spondylolysis are congenital, traumatic, mechanostatic stress, degenerative processes, the osteochondritides, destructive bone diseases and tumors. Spondylolysis is a radiologic diagnosis. In the threequarter oblique view an oval, "tear drop" shadow is
La spondylolyse et ses conséquences: Spondylolisthésis—scoliose listhésique. Étude radiologique—clinique—médico-légale. JAMA. 1937;109(15):1223. doi:10.1001/jama.1937.02780410061023