Radiographic comparison between male and female patients with lumbar spondylolysis

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We studied the lumbar spines of 117 adults (39 women and 78 men) with spondylolysisunrelated to low back pain using multidetector computed tomography (CT). Ofthe 117 subjects with spondylolysis, including five with multiple-level spondylolysis, therewere 124 vertebrae with spondylolysis. In adult lumbar spines with unilateral spondylolysis,there was no significant difference between the incidence of spondylolisthesis infemale and male subjects. However, in those with bilateral spondylolysis, there was a significantlyhigher incidence of spondylolisthesis in female subjects (90.9%) than in males(66.2%). Furthermore, females with bilateral spondylolysis had significant more slippagethan males. Lumbar index and lumbar lordosis were not significantly different betweenmale and female subjects, and did not significantly correlate with slippage. In conclusion,to treat acute spondylolysis in adolescents, it is important to obtain bony union at leastunilaterally, especially in female subjects, to prevent further slippage.