Final answer:
When full Active Range of Motion (AROM) is present in Manual Muscle Testing (MMT), the minimum score should be 3/5, which indicates that the muscle can move through its full range under the force of gravity alone.
Step-by-step explanation:
In the context of Manual Muscle Testing (MMT), the term AROM stands for Active Range of Motion. When assessing muscle strength, if a patient's AROM is full, it implies that they can actively move a joint through its complete range without any external assistance. Thus, when a patient exhibits a full AROM, the MMT score should be at least 3/5. This score indicates that the muscle has sufficient strength to move the joint through its entire range against gravity, which is the minimal requirement for a muscle to be considered functional.
However, for more nuanced grading, other factors such as resistance and the ability to maintain the end range against gravity must be evaluated. Therefore, if a patient exhibits full AROM but also demonstrates the ability to hold the position against moderate resistance provided by the examiner, the score may be higher, potentially a 4/5. On the other hand, if full AROM is achieved only against gravity with no resistance, the score remains at 3/5.