. Author manuscript; available in PMC: 2015 Aug 1.

Published in final edited form as: Neurol Clin. 2014 Aug;32(3):569–vii. doi: 10.1016/j.ncl.2014.04.008

BOX 13. EXPANDED MRC SCALE FOR MANUAL MUSCLE TESTING.

Modified MRC Grade	Degree of Strength
5	Normal power
5-	Equivocal, barely detectable weakness
4+	Definite but slight weakness
4	Able to move the joint against combination of gravity and some resistance
4-	Capable of minimal resistance
3+	Capable of transient resistance but collapses abruptly
3	Active movement against gravity
3-	Able to move against gravity but not through full range
2	Able to move with gravity eliminated
1	Trace contraction
0	No contraction