The inclusion of hyoid muscles improve moment generating capacity and dynamic simulations in musculoskeletal models of the head and neck

Jonathan D Mortensen, Anita N Vasavada, Andrew S Merryweather, Jonathan D Mortensen, Anita N Vasavada, Andrew S Merryweather

Abstract

OpenSim musculoskeletal models of the head and neck can provide information about muscle activity and the response of the head and neck to a variety of situations. Previous models report weak flexion strength, which is partially due to lacking moment generating capacity in the upper cervical spine. Previous models have also lacked realistic hyoid muscles, which have the capability to improve flexion strength and control in the upper cervical spine. Suprahyoid and infrahyoid muscles were incorporated in an OpenSim musculoskeletal model of the head and neck. This model was based on previous OpenSim models, and now includes hyoid muscles and passive elements. The moment generating capacity of the model was tested by simulating physical experiments in the OpenSim environment. The flexor and extensor muscle strengths were scaled to match static experimental results. Models with and without hyoid muscles were used to simulate experimentally captured motions, and the need for reserve actuators was evaluated. The addition of hyoid muscles greatly increased flexion strength, and the model is the first of its kind to have realistic strength values in all directions. Less reserve actuator moment was required to simulate real motions with the addition of hyoid muscles. Several additional ways of improving flexion strength were investigated. Hyoid muscles add control and strength to OpenSim musculoskeletal models of the head and neck and improve simulations of head and neck movements.

Conflict of interest statement

The authors have declared that no competing interests exist.

Figures

Fig 1
Fig 1
Model before addition of hyoid muscles (A), added hyoid muscles (B), all muscles in HYOID model (C).
Fig 2. Simulation of experimental setup to…
Fig 2. Simulation of experimental setup to compute neck moment generating capacity.
Red muscles indicate active muscles. The applied force is 20 cm above the C1-Skull joint. 150 N, 200 N, 150N, and 20 Nm were applied to compute respectively the flexion, extension, lateral bending, and axial rotation moment generating capacities.
Fig 3. Kinematic, muscle activation, and reserve…
Fig 3. Kinematic, muscle activation, and reserve actuator data for dynamic simulations of the scaled HYOID and MASI models.
All thicker lines represent the scaled HYOID model and all thinner lines represent the MASI model. “L” denotes the lower cervical spine, and “U” denotes the upper cervical spine for both the degrees of freedom and their associated reserve actuators. A negative value for flexion indicates flexion motion or moment, a positive value for lateral indicates right lateral bending, and a positive value in axial indicates left axial rotation.

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