Triceps Reflex Test

The triceps reflex provides valuable information about the integrity of the C7-C8 nerve roots and corresponding spinal cord segments. This deep tendon reflex represents a fundamental component of the upper extremity neurological examination, offering insights into potential cervical radiculopathies, myelopathies, and other neurological conditions affecting the upper extremity.

How to perform the Triceps Reflex?

This reflex is elicited by tapping the triceps tendon just above its insertion on the olecranon process of the ulna. The arm is placed midway between flexion and extension and may be rested in the patient’s lap, on her thigh or hip, or on the examiner’s hand .

The response is contraction of the triceps muscle with extension of the elbow.

See Also: Deep Tendon Reflex Testing

The most common error in eliciting the triceps jerk is simply too timorous a blow. The paradoxical or inverted triceps jerk consists of flexion of the elbow with percussion of the triceps tendon. This response appears when the afferent arc of the triceps reflex is damaged, as in lesions of the seventh and eighth cervical segments, particularly when there is an element of spasticity, as in cervical spondylosis with radiculomyelopathy.

See Also: Triceps Muscle Anatomy

Grading Scale for Deep Tendon Reflexes

• 4+ Hyperactive (clonus)
• 3+ Brisker than normal (hyperreflexive)
• 2+ NORMAL
• 1+ Diminished (hyporeflexive)
• 0 Absent

References & More

1. Walker HK. Deep Tendon Reflexes. In: Walker HK, Hall WD, Hurst JW, editors. Clinical Methods: The History, Physical, and Laboratory Examinations. 3rd edition. Boston: Butterworths; 1990. Chapter 72. Available from: Pubmed
2. DeJong’s The Neurologic Examination – 8th Edition