MMT Grading Systems 3

Question 1

What distinguishes Grade 4 from Grade 5 in the MRC MMT scale?

Accepted Answer

Ability to resist some but not full examiner resistance

Answer

Grade 4 muscles move through full ROM against gravity and some resistance, but can be overcome by the examiner.

Question 2

In the modified MMT system with plus/minus grades, how many total gradations exist between 0 and 5?

Accepted Answer

13

Answer

Including the +/− modifiers, the scale expands to 13 gradations (0, 1−, 1, 1+, 2−, 2, 2+, 3−, 3, 3+, 4−, 4, 4+, 5).

Question 3

When grading is done in a gravity-eliminated position for shoulder abduction, which plane is typically used?

Accepted Answer

Horizontal (transverse) plane

Answer

Gravity-eliminated testing for shoulder abduction is performed with the patient side-lying so movement occurs horizontally.

Question 4

A Grade 3− finding indicates the muscle:

Accepted Answer

Moves through less than half the range against gravity

Answer

Grade 3− means the muscle moves through less than half of the ROM against gravity without added resistance.

Question 5

Which grading system uses a 0–10 numerical scale rather than 0–5?

Accepted Answer

Kendall percentage scale converted to 0–10

Answer

Kendall's system uses percentages (0–100%) which are sometimes represented as a 0–10 scale for clinical shorthand.

(MMT) Manual Muscle Testing Practice Test