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Isolated triceps weakness in exercise-induced radial neuropathy

H Nukada1, P K Taylor, S D August

  • 1Department of Medicine, University of Otago Medical School, Dunedin, New Zeland.

The Journal of Sports Medicine and Physical Fitness
|December 1, 1996
PubMed
Summary

Isolated triceps weakness can occur due to radial neuropathy, particularly after strenuous exercise. This case suggests a focal conduction block as the cause, differing from typical presentations of radial nerve damage.

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Area of Science:

  • Neurology
  • Neuroscience
  • Clinical Medicine

Background:

  • Radial neuropathy typically presents with wrist drop and weakness in distal muscles.
  • Previous cases of exercise-induced radial neuropathy involved widespread distal muscle weakness.

Observation:

  • A healthy, athletic middle-aged man developed acute, isolated triceps brachii weakness.
  • The weakness was attributed to radial neuropathy, with no other muscles innervated by the radial nerve affected.
  • Clinical and electrophysiological recovery was complete within six weeks.

Findings:

  • The case demonstrates isolated triceps weakness as a sole manifestation of radial neuropathy.
  • Electrophysiology suggested a focal conduction block secondary to demyelination.
  • This presentation is distinct from previously reported cases of radial neuropathy.

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Implications:

  • This suggests a potential variant of neuralgic amyotrophy presenting with isolated triceps weakness.
  • Clinicians should consider exercise-related radial neuropathy with isolated triceps weakness in differential diagnoses.
  • This finding expands the spectrum of clinical presentations for radial nerve compression injuries.