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MRC 0–5 Power Grades:

 5: Normal

 4: 4+, 4− Active movement against gravity and resistance

 3: Active movement against gravity

 2: Active movement, gravity eliminated

 1: Flicker of contraction

 0: No visible muscle contraction.

Limitations: inability to record slight weakness & dependence on cooperation. ‘I could just overcome hip flexion’ is better than 4⁺ and 4⁻. ‘Give‐way’ weakness means poor effort and/or pain. Assess skilled hand & foot movement: ‘play piano, wriggle toes’.

Assess fatiguability, if needed. Consider focal or general muscle wasting, fasciculation, muscle bulk/consistency, myotonia.