Total extensor muscle strength test

The total extensor muscle strength test is a method to check whether the muscle is paralyzed and the degree of paralysis. The main function of the digital extensors is to straighten the first knuckles of the second to fifth fingers and have the function of extending the wrist. When this muscle is paralyzed, the first knuckle is flexed significantly, the little finger is flexed more, the fourth finger is slightly flexed, and the third finger is lighter. Due to the action of the interosseous muscle, the middle and final energy-saving parts of the fingers straighten.