Investigating the tommy john twist and its relation to elbow varus torque in professional baseball pitchers

Claims have been made that excessive forearm pronation at foot contact (FC) during a pitch, also known as ‘Tommy John Twist’, causes an increase in elbow varus torque. A sample of 148 professional pitchers were analyzed to investigate the relationship of forearm pronation and varus torque during a pitch. There was no significant correlation between forearm pronation at FC and maximum external rotation (MER) and elbow varus torque.