A sudden steering jerk can snap a human shoulder
Anatomy
During a high-speed swerve, the sheer force of a driver's defensive instinct can exceed the physical breaking point of their own tendons and bone.
When a driver yanks the steering wheel to avoid a collision at 50 kilometers per hour, they often exert a force of 1,200 Newtons—roughly three times the tension required to rupture the human shoulder. This reflexive jerk frequently tears the supraspinatus, the thick muscle responsible for lifting the arm, before the car even makes contact.