What does muscle score 0 indicate?

• A. No muscular contraction detected
• B. Trace of contraction
• C. Normal contraction
• D. Full contraction

Answer: (A)

This question hinges on understanding the muscle strength grading scale used in neurological exams. A score of zero means no detectable muscle contraction at all when attempting to activate the muscle—no observable movement and no palpable or visible twitch. In other words, the muscle is completely quiescent on examination.

This is why the option describing no muscular contraction detected is the best answer. It’s also helpful to contrast with the next grade, which is a trace contraction: a tiny flicker or palpable contraction occurs but there is still no joint movement. Higher grades indicate increasing ability to move the limb against gravity and resistance.