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Grade 0: No movement in the assessed muscle
Grade 1: Flickers of movement in the assessed muscle
Grade 2: Full range of motion, but not against gravity
Grade 3: Full range of motion , movement against gravity and no strength against an applied resistive force
Grade 4: Full range of motion, weakness against an applied resistive force
- 4- = very little resistance
- 4 = in-between (4- vs 4 is tricky, 4 vs 4+ is tricky, but 4- vs 4+ is very clear)
- 4+ = almost full strength
Grade 5: Full strength against an applied force

Signs