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It is my purpose in this paper to present a new theory relating to the cause of lame backs. The members of the profession at large know only too well that there are many symptoms of low back disabilities for which there have been no explanations. The terms sacro-iliac strain and dislocation or lumbosacral strain are in common use. Up to the present, these explanations have satisfied most physicians, depending on which side of the fence they happen to be. When roentgenograms of the sacro-iliac and lumbosacral joints are presented which show no evidence in this region of any pathologic condition, either congenital or acquired, it would seem difficult to make a positive diagnosis of either sacro-iliac or lumbo-sacral strain. One is frequently troubled by the fact that there is a negative roentgenogram of a patient whose clinical signs and symptoms are those of extreme irritation in the sacro-iliac or
OBER FR. BACK STRAIN AND SCIATICA. JAMA. 1935;104(18):1580–1583. doi:10.1001/jama.1935.02760180012004
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