THOR Neck Moment Calculation at Atlanto-Occipital Joint

In biomechanics research of human neck injuries, the moment for the upper neck was calculated to the Atlanto-Occipital (AO) joint. In this paper, a mathematical method was presented to calculate the neck moment at AO for both Test Device for Human Occupant Restraint (THOR) 50^th male and THOR 5^th female ATDs in neck flexion, extension and lateral bending directions. Detailed formula was derived according to the mechanical design and how parts functions in the ATD. The constant parameters for both THOR 50^th and 5^th were provided for the calculation. One THOR-50M neck test data was presented in this paper to illustrate the calculation results.