• Powerful pressure

•pushing a linemen(football)

• Powerful push to an arm (hockey or football) 

-a painful snap at the front of the chest and shoulder. 

- Bruising and swelling, bunches up and deforms

Pathology

•Pushing/Pulling  Heavy weight

•Arm getting forced back

-painful snap at the front of the chest and shoulder. 

-Bruising and swelling

-bunches up and deforms