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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
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.
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.
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.