The reflex should cause slight pronation or supination and slight elbow flexion. Types of pronation include neutral pronation, underpronation (supination), and overpronation. Pronation (eversion) and supination (inversion) occur along the oblique axis of the ankle joint. Repetitive motion of pronation and supination are also effective exercises for rehabilitation. When rotating the forearm, these movements are typically called pronation and supination. Together with the proximal radioulnar joint, the distal radioulnar joint permits pronation and supination. A lateral pinch and recurring grip can also be applied for supination and pronation. This movement is known as a pronation/supination test of the upper extremity. Exercising pronation and supination with a handle or screwdriver attachment will help stimulate the nerves. This muscle's primary function is elbow flexion and forearm supination. The role of the TFCC in supination and in pronation is a matter of dispute. The two main methods are hyperpronation and a combination of supination and flexion. It plantarflexes the hallux and assists in supination. Some researchers predicted force peaks at supination. "Supination" of the forearm occurs when the forearm or palm are rotated outwards.