Patients with neck pain can present also with pain in the hand and fingers. They may have difficulty with making a fist with the thumb in flexion. This movement is needed for turning a key.
The flexion of the fingers is performed the flexor digitorum profundus and flexor digitorum superficialis.
Flexion of the tip of the thumb and the knuckle joint is performed by the extensor pollicis longus. Flexion of the base of the thumb is performed by the flexor pollicis brevis and the abductor pollicis process.