What does a score of 0 on the MMT indicate?

A score of 0 on the Manual Muscle Testing (MMT) scale indicates that there is no detectable muscle contraction. This means that the muscle being tested does not respond at all to voluntary contraction, either by producing movement or even showing any signs of muscle activity. In clinical practice, this is essential information as it helps healthcare professionals assess muscle function and determines the extent of muscle impairment or paralysis. Recognizing a score of 0 is critical in diagnosing conditions affecting motor function and can guide rehabilitation efforts.

The other choices reflect varying degrees of muscle strength and contraction. A score indicating a full range of motion against gravity suggests the muscle is functioning normally, while partial range of motion with elimination of gravity indicates some retained strength. Visible muscle contraction with effort means that the muscle can contract but may not be able to produce movement against resistance. Therefore, they all describe levels of muscle activity that are not representative of a score of 0.