title: An objective clinical method to measure spinal extension.
mesh_terms: D000293:Adolescent; D000328:Adult; D000367:Age Factors; D000368:Aged; D005260:Female; D006801:Humans; D008297:Male; D008722:Methods; D008875:Middle Aged; D008954:Models, Biological; D009068:Movement; D011379:Prognosis; D011859:Radiography; D012737:Sex Factors; D012867:Skin; D013122:Spinal Diseases / Q000175:diagnosis / Q000628:therapy; D013131:Spine / Q000000981:diagnostic imaging / Q000502:physiology*; D013167:Spondylitis, Ankylosing / Q000503:physiopathology; D013223:Statistics as Topic