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Updated: Jul 29, 2026
Simultaneous Intracellular Recording of a Lumbar Motoneuron and the Force Produced by its Motor Unit in the Adult Mouse In vivo
Published on: December 5, 2012
The lumbosacral electromyographic screen: revisiting a classic paper
1Department of Physical Medicine and Rehabilitation, The Johns Hopkins University, MD, Baltimore, USA. tdilling@jhmi.edu
Objective:
Knutsson (Acta Orthopaed Scand (1961) 1) published a classic thesis comparing lower limb electromyography (EMG) results with intra-operative findings for 206 patients with sciatica. This unique and detailed work presented a rare opportunity to again use this data and determine the optimal number of muscles in a screening examination; a different study aim to that of the original investigator.
Methods:
Data from Knutsson (1961) were used to determine the identification rates and sensitivities with respect to clinical and intra-operative diagnostic standards, for various muscle screens.
Results:
Selected 4 muscle EMG screens identified over 97% of EMG confirmed radiculopathies and over 89% of surgically confirmed radiculopathies.
Conclusions:
These findings underscore the utility of 4 muscle EMG screens in the evaluation of patients with suspected lumbosacral radiculopathy.
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