title: "Supine-prone" dynamic X-ray examination: new method to evaluate low-grade lumbar spondylolisthesis.
abstract: Lumbar instability often causes clinical symptoms, and spondylolisthesis is a main factor of the low back pain. Segmental lumbar instability generally is due to a degenerative or listhesic process of the lumbar spine and radiological imaging is essential to diagnose it. Lumbar spine segmental mobility has commonly been studied by dyanamic radiographic methods. Dynamic X-rays, with maximal extension and flexion of the lumbar tract, represents the most widely used technique and a valid method to estimate sagittal segmental lumbar motion. Between 1998 and 2002 we treated 75 patients for low-grade spondylolisthesis. All patients underwent a preoperative dynamic X-rays examinination, to evaluate the degree of the lumbar mobility. We report a supine-prone position as new method to clearly estimate the slipping of lumbar vertebrae. The patients had a standard lateral X-rays film in the supine position, and then in the "prone" position. We compared the two methods and we found a higher degree of listhesis in 19 cases (14 I grade, 5 I-II grade), while there was no difference in 56 cases. The higher degree of listhesis was in the prone position. We believe that the supine-prone position is an economic method and should be mandatory performing a dynamic X-rays examination.
authors.affiliation: Department of Neurological Sciences, II Faculty of Medicine, University of Rome La Sapienza, S. Andrea Hospital, V.L. Mantegazza 8, 00152 Rome, Italy. gdandrea2002@yahoo.it
authors.forename: Giancarlo
authors.initials: G
authors.lastname: D'Andrea
authors.forename: Luigi
authors.initials: L
authors.lastname: Ferrante
authors.forename: Lavinia
authors.initials: L
authors.lastname: Dinia
authors.forename: Emanuela
authors.initials: E
authors.lastname: Caroli
authors.forename: Epimenio Ramundo
authors.initials: ER
authors.lastname: Orlando
mesh_terms: D006801:Humans; D008159:Lumbar Vertebrae / Q000000981:diagnostic imaging*; D016684:Prone Position; D011859:Radiography; D013168:Spondylolisthesis / Q000000981:diagnostic imaging*; D016683:Supine Position