Final answer:
To maintain proper alignment of the thumb and wrist, a wrist brace or splint can be used to stabilize the joint, accompanied by specific exercises targeting the extensor radialis longus and flexor carpi radialis.
Step-by-step explanation:
To maintain proper alignment of the thumb and wrist in slight dorsiflexion, one could use supportive devices like splints or braces. These devices help to stabilize the joint while allowing movements like the opposition movement of the thumb, which brings the thumb in contact with the fingers, making it possible to grasp and hold objects. To support this motion, the extensor radialis longus assists in extending and abducting the wrist. Additionally, specific exercises that strengthen the flexor carpi radialis muscle, which flexes and abducts the hand at the wrist, can be beneficial in maintaining proper wrist alignment and function.