muscle strength testing: May be tested manually or with the use of various machines. When tested manually, most doctors use a modified Lovett scale, which assigns a number grade to the muscle strength. 8
* The most common usage of this system uses 5 to indicate "normal".
* Grades 4+, 4, and 4- are used to indicate decreasing muscle function within the "good" category, which is defined as the ability to raise the part against gravity and some resistance.
* Grades 3+, 3, and 3- are used to indicate decreasing muscle function within the "fair" category, which is defined as the ability to raise the part against gravity only.
* Grades 2+, 2, and 2- are used to indicate decreasing muscle function within the "poor" category, which is defined as the ability to raise the part only with gravity eliminated.
* Grade 1 means that the muscle contraction can be felt, but there is no joint movement. Grade 0 means no contraction is felt.