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11.7: Assessing Motor Strength

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    A brief musculoskeletal assessment is performed as part of the neurological assessment to determine the neurological stimulation of bilateral strength. Read more details about muscles and musculoskeletal assessment in the “Musculoskeletal Assessment” chapter. Unequal extremity motor strength can indicate underlying neurological disease or injury. Assessing motor strength includes comparing bilateral hand grasps, upper extremity strength, and lower extremity strength. Keep in mind that extremities on the dominant side are usually slightly stronger than the nondominant side.

    Hand Grasps

    To perform a hand grasp test, extend two fingers on both hands toward the patient. Ask the patient to squeeze both of your hands and compare for similar bilateral strength. See Figure \(\PageIndex{1}\) [1] for an image of assessing hand grasp strength.

    Photo showing a person sitting and grasping another person's fingers
    Figure \(\PageIndex{1}\)​​​​​​​ Assessing for Equal Strength in Bilateral Hand Grasps

    Upper Extremity Strength

    To test upper extremity strength, ask the patient to extend their forearms with palms facing upwards. Place your hands on their inner forearms and ask them to pull their arms toward them while you provide resistance. An expected finding is the patient strongly bilaterally pulls against resistance with both arms.

    An alternative test is to ask the patient to put their hands in the air with their palms facing you. Place your palms against theirs and ask them to push while you provide resistance. See Figure \(\PageIndex{2}\)​​​​​​​ ​​​​​​​[2] for an image of assessing upper body strength.

    Photo of simulated patient being tested for upper extremity strength
    Figure \(\PageIndex{2}\)​​​​​​​: Assessing for Equal Upper Extremity Strength

    Lower Body Strength

    To assess lower body strength while the patient is in a seated position, place your hands behind their calves. Ask them to pull backwards with their lower legs while you provide resistance in the opposite direction.

    Alternative tests are to place your hands on the patient’s lower thighs and ask them to lift their legs upwards while you provide downward resistance, or place your hands on the top of their feet and ask them to pull their toes upwards while you provide resistance. In a similar manner, you can also place your hands on the dorsal part of their feet and ask them to press downwards “like pressing the gas pedal of a car,” while providing resistance. Compare lower extremity strength on both sides. See Figure \(\PageIndex{3}\)[3] for images of assessing lower extremity strength.

    Photo of simulated patient being assessed for Equal Strength in Lower Extremities
    Figure \(\PageIndex{3}\): Assessing for Equal Strength in Lower Extremities
    1. "Neuro Exam Image 38.png" by Meredith Pomietlo for Chippewa Valley Technical College is licensed under CC BY 4.0↵
    2. "Neuro Exam Image 41.png" and "Neuro Exam Image 39.jpg" by Meredith Pomietlo for Chippewa Valley Technical College are licensed under CC BY 4.0↵
    3. "Musculoskeletal Exam Image 2.png," "Neuro Exam image 6.png," and "Musculoskeletal Exam Image 7.png" by Meredith Pomietlo for Chippewa Valley Technical College are licensed under CC BY 4.0↵

    This page titled 11.7: Assessing Motor Strength is shared under a CC BY-SA license and was authored, remixed, and/or curated by Valerie J. Bugosh, Leisa E. McAlicher, & Katherine Zaharchuk.