Morphometry of the lower lumbar vertebrae in patients with and without lowback pain

The authors made several measurements in the lower lumbar vertebrae of pati ents with and without low back pain. Our objective was to determine the all ometric relationships between different dimensions of the lumbar canal, the effects on these from degenerative disease, and differences between the sy mptomatic and asymptomatic populations. We compared 119 patients suffering from low back and sciatic pain and 39 subjects without lumbar symptoms as d etermined by computed tomography (CT). The following measurements were made : sagittal diameter of the canal, interpedicular distance, interarticular d istance, and anteroposterior diameter of lateral recess and foramen. With r espect to the patients with lumbar pain, the asymptomatic group proved to h ave wider foramina from L3 to L5 and wider sagittal diameters in S1. The pa tients with canal stenosis revealed lower figures for all diameters of the central canal, lateral recess of L4, and foramina of L4 and L5. Patients wi th lumbarization showed smaller diameters of the central canal. Conclusion. There is an allometric relationship between the dimensions of the central canals. This relationship is less evident with lateral canals. The patients without lumbar symptoms had wider foramina and sagittal diameters in S1 th an those with lumbar symptoms. Of these, patients who developed symptoms of canal stenosis demonstrated smaller diameters in central and lateral canal s. Of the developmental anomalies, lumbarization proved to be associated wi th canal stenosis due to smaller diameters of the central canals.