What does a score of 2/5 in manual muscle testing correspond to?

A score of 2/5 in manual muscle testing indicates poor muscle strength against gravity, specifically when the muscle is tested in a gravity-eliminated position. This score reflects the ability of the muscle to move through the range of motion when gravity does not act on it, suggesting that some muscle contraction is present, but not sufficient to move the limb against gravity. In this context, a score of 2/5 signifies that the muscle can engage and generate a contraction, but it cannot perform the movement against gravitational resistance. This testing is essential for assessing muscle function in patients with various impairments, allowing therapists to tailor rehabilitation strategies effectively. The other score interpretations such as normal muscle strength, fair strength against gravity, or trace strength do not align with the specific capabilities associated with a 2/5 rating.