A generic detailed rigid-body lumbar spine model

Area of Science:

• Biomechanics
• Musculoskeletal Modeling
• Spinal Research

Background:

• Reproducibility in spinal research is limited by the lack of shared models.
• Existing models are often difficult to share and modify across research groups.

Purpose of the Study:

• To develop a shareable, text-based musculoskeletal model of the lumbar spine.
• To facilitate collaborative research and improve model quality through shared efforts.
• To enable detailed biomechanical investigations of the lumbar spine.

Main Methods:

• Utilized a text-based, declarative, object-oriented language within the AnyBody Modelling System.
• Incorporated data from existing literature for model parameterization.
• Employed inverse dynamics with optimization to solve muscle force redundancy and compute joint reactions.

Main Results:

• Created a detailed lumbar spine model with seven rigid segments, 18 degrees-of-freedom, and 154 muscles.
• The model can generate a maximum extension moment of 238 Nm at L5/S1.
• Model predictions showed good agreement with in vivo L4-L5 intradiscal pressure measurements.

Conclusions:

• The developed lumbar spine model is readily shareable and modifiable, promoting collaborative research.
• The model provides a robust platform for investigating various research questions in spinal biomechanics.
• Further validation is recommended for specific research applications.