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John B. Tyrrell, M.D.
JAMA. 1945;128(7):540. doi:10.1001/jama.1945.02860240066027.
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To the Editor:—  Dr. Keegan (Diagnosis of Herniation of Lumbar Intervertebral Disks by Neurologic Signs, The Journal, Dec. 2, 1944, p. 808) describes a technic submitted to him by Dr. A. W. Abts in a personal communication. Disclaiming any intention to establish a prior use, or of any attempt to claim credit for devising the technic, I do put forth the simple statement that during my service in World War I, while on duty as a medical officer at Peter Bent Brigham Hospital, Boston, in 1918 and later at the Base Hospital at Camp Devens, Mass., I worked out a technic identical with that described by Dr. Keegan, the only variation being that with the knee fully flexed on the thigh and the thigh fully flexed on abdomen, instead of forcible and quick extension at this juncture of the procedure, a torsion movement of the knee is executed toward the


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