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Muscle power grading using the Medical Research Council scale.
| Grade | Description |
| 0 | No contraction |
| 1 | Flicker or trace of contraction |
| 2 | Active movement with gravity eliminated |
| 3 | Active movement against gravity |
| 4 | Active movement against gravity and moderate resistance |
| 4+ | Active movement against gravity and strong resistance |
| 5 | Normal power |
