Spinal Canal Stenosis: Concept of Spinal Reserve CapacityRadiologic Measurements and Clinical ApplicationsWeisz, George, M.*; Lee, Paul**Clinical Orthopaedics and Related Research: October 1983 - Volume 179 - Issue - p 134–140 Section II: GENERAL ORTHOPAEDICS: PDF Only Free Abstract Author InformationAuthors Radiologic measurement of central spinal canal diameters is considered a static measurement and does not necessarily indicate active stenosis. A free intracanal space is detectable with CT scanning, i.e., a container/content difference expressing reserve capacity and implying a functional identity. The obliteration of this space may induce clinical symptomatology in the elderly and in persons with developmental or acquired lumbar spinal conditions. Normal and pathologic measurements are presented. * Department of Orthopaedics, Marrickville District Hospital and St. Luke's Hospital, Sydney, Australia. ** Department of Radiology, St. Vincent's Hospital, Sydney, Australia. © Lippincott-Raven Publishers.