Abnormalities of the lumbar spine in the coronal plane on plain abdominal radiographs.

The main objective of this study is to determine the prevalence of coronal abnormalities of the lumbar spine in a large population of patients with respect to their age and sex. Lumbar degenerative disease is associated with degenerative scoliosis. Degenerative scoliosis and lateral listhesis are important features to identify before decompressive surgery as deformity may not be seen on magnetic resonance imaging scans. Scoliosis and lateral listhesis may be important in the development of symptoms especially in an ageing population. All abdominal and plain kidney-ureter-bladder radiographs performed over a 10-month period were reviewed. 2,765 radiographs were assessed for scoliosis (Cobb angle greater then 10°), lateral listhesis and evidence of osteoarthritis. The prevalence of scoliosis, lateral listhesis and osteoarthritis of the lumbar spine increased with age. Scoliosis and lateral listhesis were significantly more prevalent in women. Deformity starts to occur after the age of 50 and steadily increases with age. By the ninth decade nearly a quarter of patients have evidence of scoliosis and lateral listhesis. As the adult lumbar spine ages, the prevalence of lateral listhesis and degenerative scoliosis increases. It is important to appreciate these coronal abnormalities in patients undergoing decompressive surgery for spinal stenosis. This increase in deformity may have a greater impact as the population continues to age.