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Quadrupedal gait after poliomyelitis (1)

Sequential lateral images of a boy with a lateral sequence quadrupedal (bear crawl) gait after poliomyelitis. Note the accentuated anterior pelvic tilt and lumbar lordosis producing a swayback posture, the marked atrophy of the leg muscles, and the back-kneeing (genu recurvatum). The boy was photographed by pioneering British-American photographer Eadweard Muybridge and American neurologist Francis Dercum in 1885 (Lanska 2013; 2016a; 2016b). The images are from Plate 539 in Eadweard Muybridge’s Animal Locomotion (1887) (Muybridge 1887; Lanska 2016b). (Contributed by Dr. Douglas Lanska. Public domain. Courtesy of the Boston Public Library and available either through Wikimedia commons or Digital Commonwealth Massachusetts Collections Online.)