Study Design
Cross-sectional study.
Objectives
1) to determine prevalence rates of spondylolysis, isthmic and degenerative spondylolisthesis in an unselected adult community-based population; 2) to evaluate the association of spondylolysis, isthmic and degenerative spondylolisthesis with low back pain (LBP).
Summary of Background Data
Spondylolysis and spondylolisthesis are prevalent in the general population; however the relationship between these conditions and LBP is controversial.
Methods
This study was an ancillary project to the Framingham Heart Study. A sample of 3529 participants of the Framingham Heart Study aged 40–80 years underwent multi-detector CT imaging to assess aortic calcification. 188 individuals were consecutively enrolled in this study to assess radiographic features potentially associated with LBP. The occurrence of LBP in the preceding 12 months was evaluated using a self-report questionnaire. The presence of spondylolysis and spondylolisthesis was characterized by CT imaging. We used multiple logistic regression models to examine the association between spondylolysis, spondylolisthesis and LBP, while adjusting for gender, age and BMI.
Results
21 study subjects demonstrated spondylolysis on CT imaging. The male-to-female ratio was approximately 3:1. 21% of subjects with bilateral spondylolytic defects demonstrated no measurable spondylolisthesis. The male-to-female ratio of degenerative spondylolisthesis was 1:3, and the prevalence of degenerative spondylolisthesis increased from the fifth through eight decades of life. 38 subjects (20.4%) reported significant LBP. No significant association was identified between spondylolysis, isthmic spondylolisthesis, or degenerative spondylolisthesis, and the occurrence of LBP.
Conclusions
Based on CT imaging of an unselected community-based population, the prevalence of lumbar spondylolysis is 11.5%, nearly twice the prevalence of previous plain radiograph-based studies. This study did not reveal a significant association between the observation of spondylolysis on CT and the occurrence of LBP, suggesting that the condition does not appear to represent a major cause of LBP in the general population.