Edward Reynolds and Robert W. Lovett, An experimental study of chronic backache (1910)
“ We believe that static backache is essentially a mechanical disorder; that is, that it is the result of loss of balance producing local strain on the tissues in the lumbosacral region and elsewhere in the posterior musculature. We further believe, and regard it as our most essential point, that whatever the local mechanism which produces the symptoms may be, such backache is in a large proportion of all cases not a disease in itself (as suggested by such terms as "hysterical spine," "relaxation of the sacro-iliac joints," etc.) ”
