Secular trend in the opening of the sacral canal: an Australian study.

Abstract excerpt

STUDY DESIGN: Computer tomography scans were used to asses the opening of the sacral canal. OBJECTIVE: We investigated the prevalence of sacral spina bifida occulta in 2 population groups: born 1940 to 1950 and 1980 to 1990. SUMMARY OF BACKGROUND DATA: Comparison of the prevalence of spina bifida occulta in the first-century Pompeii with that in 20th century European and Mediterranean populations indicates that...

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