The Medical Research Council (MRC) grading of muscle strength is divided into 6 levels[^1].
MRC muscle strength grades
Strength grade (M) | Description |
M0 | No muscular activity, complete paralysis corresponding to a plegia. |
M1 | Visible and/or palpable contraction without movement. |
M2 | Movement possible with gravity eliminated. |
M3 | Movement against gravity is just possible. |
M4 | Movement against slight resistance. |
M5 | Normal strength. |