Elbow joint muscles master complicated force application patterns or suffer centrifugal acceleration injuries. Pitching Elbow Joint Actions 1. Lateral flexions require humerus outward rotations and ulna flexions. During upper arm accelerations, elbow joint muscles isoanglosly medially flex ulnas to fix elbow joint angles. Humeruses powerfully drive toward home plate.
Medial flexions require humerus inward rotations and ulna flexions.
During forearm accelerations, elbow joint muscles powerfully mioanglosly medially flex elbow joints. After humeruses start decelerating, ulnas start driving toward home plates. During decelerations, elbow joint muscles plioanglosly laterally flex elbow joints to stop ulnas' forward movements. Strong ligaments prevent ulnas from moving away from humeruses during forearm accelerations and slamming back into humeruses during decelerations. However, radial heads do not have similar strong ligaments.