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Table 1 Modified Medical Research Council system of grading elbow flexion

From: Motor grading of elbow flexion – is Medical Research Council grading good enough?

Grade Subdivision Description
0 - No contraction
1 - Perceptible contraction in the muscle but no movement
2   Gravity Eliminated
  A Motion less than or equal to half range
  B Motion more than half range
  C Full range of motion
3   Against Gravity
  A Motion less than or equal to half range
  B Motion more than half range
  C Full range of motion
4   Motion Against Resistance
  A Able to lift less than 30% weight of the normal side through full range
  B Able to lift 30–60% weight of the normal side through full range
  C Able to lift more than 60% weight of the normal side through full range
5   Normal strength