The Medical Research Council (MRC) Sum Score applies the MRC muscle strength scale to 6 bilateral muscle groups.
Muscle groups:
(1) left shoulder abductors
(2) right should abductors
(3) left elbow flexors
(4) right elbow flexors
(5) left wrist extensors
(6) right wrist extensors
(7) left hip flexors
(8) right hip flexors
(9) left knee extensors
(10) right knee extensors
(11) left foot dorsiflexors
(12) right foot dorsiflexors
Muscle Strength
Scale
normal
5
movement against gravity and resistance
4
movement against gravity over all or most of the full range
3
movement of limb but not against gravity
2
visible contraction without movement (exclude hip flexors)
1
no visible contraction
0
total sum score =
= SUM(points for all 12 muscle groups)
Interpretation:
• minimum score: 0 (quadriplegic)
• maximum score: 60
• The higher the score the greater the overall muscle strength.
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Specialty: Surgery, orthopedic, Surgery, general
