Abstract
Herniated intervertebral disk has become recognized as the commonest cause of unilateral pain in the lower part of the back and of unilateral sciatic pain, on the basis of hundreds of cases in which the presence of the pathologic process has been verified at operation. Knowledge of the varying history and physical signs of this lesion has improved greatly as a result of the impetus given to the subject by Mixter and Barr1in 1934, through the application of intraspinal injection of iodized poppyseed oil and surgical methods to the demonstration of the lesion. In recent years there has developed increasing conservatism in the intraspinal use of iodized poppyseed oil, as a result of inflammatory and medicolegal complications, and greater emphasis has been placed on arrival at the diagnosis from the history and neurologic signs.2However, because of lack of anatomic definition, there is still considerable confusion and
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