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This peculiar symptom-complex has been variously termed rheumatoid arthritis of the spine, spondylose rhizomélique, etc., and is a fixation of the vertebral segments. In the moderate degrees of this affection, the patients move with their back "all of a piece." In stooping, it may be accompanied with some movements of the hips, but usually it is a flexion of the knees and not a bending forward at the hips. At first, certain segments of the spine, notably the lumbar and cervical regions present the most marked limitation of motion. Gradually these become fixed and sometimes extension and flexion of the head are impossible. Usually, however, this last movement is retained, but there is some limitation to rotation of the head and practically little or no movement between the segments of the vertebræ. A careful study of these cases has revealed a varying pathology. In some the bodies of the vertebræ
RIGID SPINE. JAMA. 1900;XXXIV(10):629. doi:10.1001/jama.1900.02460100051018
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