🧠 Romberg Sign
Definition:
The Romberg test assesses proprioception — the body’s sense of position in space — which depends on dorsal column function of the spinal cord.
How to perform:
Ask the patient to stand with feet together and arms by the side.
First with eyes open, then eyes closed.
Observe for swaying or loss of balance.
Interpretation:
✅ Negative Romberg sign: Patient remains stable with eyes closed → normal proprioception and vestibular function.
⚠️ Positive Romberg sign: Patient stands steadily with eyes open but sways or falls when eyes are closed → sensory ataxia (loss of proprioception).
Indicates:
Lesion of dorsal columns or sensory pathways (not cerebellar).
Causes of positive Romberg:
Tabes dorsalis (neurosyphilis)
Vitamin B12 deficiency
Peripheral neuropathy (diabetes, alcoholism)
Posterior column disease
Key Point:
👉 Cerebellar ataxia causes unsteadiness even with eyes open, so Romberg test is not positive in cerebellar lesions.
💪 Pronator Drift Test
Definition:
The Pronator drift test detects subtle upper motor neuron (UMN) weakness and corticospinal tract lesions.
How to perform:
Ask the patient to extend both arms forward, palms up, eyes closed.
Observe for 30 seconds.
Interpretation:
✅ Normal: Both arms remain steady.
⚠️ Positive Pronator drift: One arm pronates (palm turns downward) and drifts downward — indicates contralateral corticospinal tract lesion.
Variants:
Upward drift → cerebellar lesion (with outward movement).
Downward + pronation → pyramidal (UMN) lesion.
Indicates:
Lesion in motor cortex or corticospinal tract (commonly in stroke, multiple sclerosis, brain tumor).
This clinical sign or examination test is commonly used in medical diagnosis and bedside examination. Understanding its mechanism, causes, ECG correlation, and treatment is essential for MBBS students, NEET PG aspirants, and practicing doctors. This video provides a concise explanation for quick revision.