The long trunk muscles not included in previous models, short segmental muscles, lumbar ligaments and disc stiffnesses were implemented into a commercially available musculoskeletal spine model construct. For several activities of daily living, the loads acting on the vertebral bodies were then calculated relative to the value for standing, and then compared to the corresponding values measured in vivo.
Good agreement between calculated and measured results could be achieved in all cases, with a maximum difference of 9 % . The highest muscle forces were predicted in the m. longissimus (146 N) for flexion, in the m. rectus abdominis (363 N) for extension, and in the m. psoas major (144 N and 81 N) for lateral bending and axial rotation.
This study has demonstrated that the inclusion of the complete set of muscle and ligament structures into musculoskeletal models of the spine is essential before accurate spinal forces can be determined. For the first time, trend validation of spinal loading has been achieved, thus allowing confidence in the precise prediction of muscle forces for a range of activities of daily living.