Which muscle grade is indicated for a patient who can move their limb against gravity but demonstrates gradual release of the position?

The appropriate muscle grade for a patient who can move their limb against gravity but exhibits a gradual release of that position is Fair. In muscle grading, Fair indicates that the patient demonstrates complete range of motion against gravity but with some difficulty or lack of endurance, which is characterized by the gradual release of the position.

In this case, the patient is capable of moving against the force of gravity, which is critical for defining Fair muscle strength, but the observation of a gradual release indicates that the patient may not have sufficient strength or stability to maintain that position without assistance. This highlights the aspect of muscular endurance rather than outright strength.

In contrast, Poor would indicate that the patient can only move their limb in a gravity-eliminated position, while Good implies full range of motion against gravity with minimal resistance or no sign of fatigue. Normal would suggest optimal strength, maintaining a position without any gradual release. Thus, Fair is the most fitting designation based on the criteria of movement against gravity and the observed gradual release.