To the Editor.
—The introductory section of the article on evoked potentials by Perlik et al1 in the September 1986 issue of the Archives echoes the title with a statement: "In this report we both confirm and amplify the usefulness of this method for evaluating patients with LBP [lower back pain]." Unfortunately, the design of the study does not allow for any meaningful conclusions as to the clinical usefulness of somatosensory evoked responses.In spite of technical deficiencies, such as the lack of a horizontal calibration signal in the illustrations, and the indication of vertical calibration in millivolts rather than microvolts, the article presents valuable data derived from the use of evoked potential techniques in patients with lumbosacral radiculopathy syndromes. Some apparently significant differences were illustrated in groups based on radiographically defined pathologic processes. The use of these data in "decisions on patient management," however, is mentioned only in
Jaffe R. Somatosensory Evoked Potentials: Usefulness in Cases of Radiculopathy? Arch Neurol. 1987;44(5):473–474. doi:10.1001/archneur.1987.00520170005008
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