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Single image from photographic sequence of a boy with a lateral sequence quadrupedal (hands-and-feet bear crawl) gait after poliomyelitis

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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 images are from Plate 539 in Muybridge’s Animal Locomotion (Muybridge E. Animal locomotion: an electrophotographic investigation of consecutive phases of animal movements, 1872-1885. Philadelphia: University of Pennsylvania, 1887). The boy was photographed by English-American photographer Eadweard Muybridge (1830-1904) and Francis Xavier Dercum (1856-1931) in 1885. (Public domain. Courtesy of the Boston Public Library and available either through Wikimedia Commons or Digital Commonwealth Massachusetts Collections Online.)

For details, see:
Lanska DJ. The Dercum-Muybridge collaboration for sequential photography of neurologic disorders. Neurology 2013;81:1550-4.
Lanska DJ. The Dercum-Muybridge collaboration and the study of pathologic gaits using sequential photography. J Hist Neurosci 2016a;25:23-38.
Lanska DJ. A human quadrupedal gait following poliomyelitis: From the Dercum-Muybridge collaboration (1885). Neurology 2016b;86:872-6.