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Dr. J. G. Manson: A 21-year-old man, involved in an automobile accident, was thrown from the car and landed on his back, possibly striking his back against a telephone pole. He was unconscious for a brief period immediately after the accident. At another hospital x-ray films of the lumbar spine showed a fracture of one and probably both superior articular facets of S1 with anterior dislocation of L5 on S1 (Fig 1). He had never had back symptoms prior to the accident. He was treated with bed rest, and the day after his injury he was unable to void urine or pass gas by rectum. A Foley catheter was placed in his bladder, and he was transferred to the Massachusetts General Hospital.
At the time of admission his vital signs were stable. He was fully conscious and cooperative. Massive ecchymosis was present over the lumbar region and over the right
Aufranc OE, Jones WN, Harris WH. Traumatic Spondylolysthesis. JAMA. 1964;187(9):666–669. doi:10.1001/jama.1964.03060220040013