Prevalence and Characteristics of Lumbar Spondylolysis in White and Black Patients.

Abstract

Study design: Retrospective case series.

Objective: To the best of our knowledge, the prevalence of lumbar spondylolysis in white and black populations has never been studied using computed tomography (CT). The purpose of this study was to examine and compare the prevalence and characteristics of lumbar spondylolysis in white and black patients.

Methods: This study is a cross sectional study. Patients aged 20-79 who underwent abdominal and pelvic CT for trauma screening in the New York City area and whose race was classified as "white" and "black" on the questionnaire were recruited to the study. A total of 1200 white patients (600 women, 600 men) and 1200 black patients (600 women, 600 men) were included for the analysis. The presence of lumbar spondylolysis, level, unilateral/bilateral, and the presence of spondylolisthesis at lumbar spondylolysis level were evaluated using CT.

Results: The prevalence of lumbar spondylolysis was 3.0% (n = 36) for white patients and .8% (n = 10) for black patients, with 3.3% (n = 20) and 1.0% (n = 6) for white and black females, respectively; and 2.7% (n = 16) and .7% (n = 4) for white and black males, respectively. The prevalence of lumbar spondylolysis was significantly higher in white patients compared with that in black patients (P < .0001). Lumbar spondylolysis was at L5 in 44/46 patients (95.7%) and bilateral in 41/46 patients (89.1%). Spondylolisthesis at lumbar spondylolysis level was found in 40/46 patients (87.0%).

Conclusions: The prevalence of lumbar spondylolysis was 3.0% for white patients and .8% for black patients. The prevalence of lumbar spondylolysis was significantly higher in white patients compared with that in black patients.