Biomechanical risk estimates for mild traumatic brain injury

Area of Science:

• Biomechanics
• Neuroscience
• Sports Medicine

Background:

• Mild traumatic brain injury (MTBI) is a significant concern in contact sports.
• Previous research has limited data on head impact tolerance in living humans.

Purpose of the Study:

• To characterize the risk of MTBI in collegiate American football players.
• To establish preliminary injury assessment reference values for head impacts.

Main Methods:

• Real-time head acceleration data collected from helmet-mounted accelerometers.
• Analysis of over 27,000 head impacts, including those resulting in MTBI.
• Development of parametric risk curves by normalizing injury incidence with impact exposure.

Main Results:

• Four instances of MTBI were recorded from over 27,000 head impacts.
• Living humans can tolerate higher head impact forces than previously assumed.
• Proposed 10% MTBI risk values: 165 g peak linear acceleration, 400 HIC, 9000 rad/s² peak angular acceleration.

Conclusions:

• Collegiate football players experience substantial head impacts without apparent injury.
• The findings suggest current injury thresholds may be conservative.
• New reference values are proposed for MTBI risk assessment in head impacts.