If your hand were injured and you lacked a thumb, you would be disabled in performing the

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The pincer grasp requires the use of the thumb to hold and manipulate objects between the tips of the thumb and fingers. Without a thumb, it would be difficult to perform this type of grasp, and therefore the individual would be disabled in using this particular hand function. The palmar grasp (A) and ulnar grasp (D) can still be performed without the use of the thumb, although they may be somewhat compromised. Various types of walking (A) are unrelated to hand function.

If Your Hand Were Injured and You Lacked a Thumb