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Musculoskeletal model of trunk and hips for development of seated-posture-control neuroprosthesis

Joris M. Lambrecht, MS, et al.

Figure. Schematic of joint angle definitions. While lumbar spine is also free to twist axially (yaw), muscle activations were constrained to prevent axial twist in this study. Trunk pitch (flexion) is defined as sum of pelvic and lumbar pitch.

The paralysis resulting from spinal cord injury severely decreases mobility, causing an increased risk of pressure sores, unhealthy postures, and difficulty breathing. Paralysis of the back and hip muscles also limits a person's ability to perform reaching tasks with both hands. We have developed a mathematical model to study the muscles involved in seated-posture control. Using this model, we have determined which muscles to electrically stimulate to restore the most function. This information may be used to develop an implantable system to improve seated posture, allowing users to reach farther and be more confident and independent.


Volume 46 Number 4, 2009
   Pages 515 — 528

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