Paul Blocq and (psychogenic) astasia abasia

The Greek term astasia-abasia literally translates to mean inability to stand and to walk. Although today we would classify the syndrome as a conversion disorder, it was considered a separate disease by Paul Blocq (1860-1896), who described this phenomenon as the inability to maintain an upright posture, despite normal function of the legs in the bed. Paul Blocq's original 1888 articles on astasia abasia were read, partly translated from French to English, and the cases were summarized. A review of a selection of the literature following Blocq's description on astasia abasia was performed. Present day literature was consulted as well. Blocq reviewed what was known about astasia abasia in two papers. Although he was the first to use the combined term astasia abasia, he referred to similar descriptions of Charcot, Richer, Mitchell, Jaccoud, Roméi, and Erlenmeyer. Blocq's contribution was in compiling the experiences and observations of preeminent 19th century neurologists. He recognized that paralysis, jumping, fits, tremor, and bizarre behavior could all be associated with the syndrome. He distinguished the disorder from hysteria. Moreover, he presented a formal delineation of the gait disorder and provided a pathophysiologic concept. Prognosis was considered favorable. Paul Blocq directed attention to psychogenic gait disorders by publishing a small case series on astasia abasia. Today, these case descriptions would be likely considered cases of conversion or psychogenic gait disorder, with or without other conversion/psychogenic movement disorders.