Version May 2024
| MRC Adaptation A | MRC Adaptation B | Kendall 10-Point Scale |
| 5 Normal strength. | 5 Normal strength. | 10 Holds test position against strong pressure. |
| 5– Uncertain muscle weakness. | 5– Barely detectable weakness. | N/A |
| 4+ Inability to resist against maximal pressure throughout range of motion. | 4S Same as 4 but stronger than reference muscle. | 9 Holds test position against moderate to strong pressure. |
| 4 Ability to resist against moderate pressure throughout range of motion. | 4 Muscle is weak but moves joint against a combination of gravity and some resistance. | 8 Holds test position against moderate pressure. |
| 4– Ability to resist against minimal pressure throughout range of motion. | 4W Same as 4 but weaker than reference muscle. | 7 Holds test position against slight to moderate pressure. |
| 3+ Ability to move through full range of motion against gravity and to resist against minimal pressure through partial range of motion, then contraction breaks abruptly. | 3+ The muscle is capable of transient resistance but collapses abruptly. This degree of weakness is difficult to put into words, but it is a muscle that is able to move the joint against gravity and an additional small amount of resistance. It is not to be used for muscles capable of sustained resistance throughout the whole range of movement. | 6 Holds test position against slight pressure. |
| 3 Ability to move through full range of motion against gravity. | 3 Muscle cannot move against resistance but moves the joint fully against gravity. With the exception of knee extensors, the joint must be moved through the full mechanical range against gravity. If a patient has contractures that limit movement of the joint, the mechanical range will obviously be to the point at which the contractures cause a significant resistance to the movement. | 5 Holds test position (no added pressure). |
| 3– Ability to move through greater than one-half range of motion against gravity. | 3– Muscle moves the joint against gravity but not through the full extent of the mechanical range of the joint. | 4 Gradual release from test position. |
| 2+ Ability to move through less than one-half range of motion against gravity. | N/A | 3 Moves through partial range of motion against gravity. |
| 2 Ability to move through full range of motion with gravity eliminated. | 2 Muscle moves the joint when gravity is eliminated. | 2 Moves through complete range of motion on a horizontal plane. |
| 2– Ability to move in any arc of motion with gravity eliminated. | N/A | 1 Moves through partial range of motion on a horizontal plane. |
| 1 A flicker of movement is seen or felt in the muscle. | 1 A flicker of movement is seen or felt in the muscle. | T A flicker of movement is seen or felt in the muscle. |
| 0 No contraction palpable. | 0 No movement. | 0 No visible movement of the part. |
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