The Wrist
Extension of the hand at the wrist joint can be indicated by dorsiflexion. In the anatomical position, dorsiflexion refers to moving the hand backward, towards the back or “top” of the arm. On the other hand, flexion that involves the hand moving towards the body’s anterior or palmar surface is known as palmar flexion, specifically towards the “underside” of the arm. It is important to note that the arms and legs have opposite embryological rotations, leading them to move in opposite directions.
Hyperflexion
Hyperflexion is a motion in which joints flex beyond their normal range of motion. Unlike hyperextension, which is more common, hyperflexion is a less frequently occurring phenomenon due to the nature of our joints. It is worth noting that hyperflexion often accompanies hyperextension. For instance, in car accidents, the sudden jerking motion of the head can lead to cervical whiplash, causing both hyperextension and hyperflexion. As a result of these abnormal joint movements, the surrounding muscles, tendons, and ligaments can suffer tears and injuries.