Animation of in vitro biomechanical tests

Area of Science:

• Biomechanics
• Biomedical Engineering
• Orthopedics

Background:

• Interdisciplinary communication of 3D kinematic data from in vitro biomechanical tests is challenging.
• Complex kinematic representations like helical axes of motion (HAM) and integration with load/strain data further complicate interpretation.

Purpose of the Study:

• To develop a graphical method for replaying and animating in vitro biomechanical tests, including HAM data.
• To enable intuitive interpretation of kinematic and associated data for diverse expert audiences.

Main Methods:

• Developed custom software to animate reconstructed CT models based on recorded experimental kinematics.
• Used optoelectronic motion analysis to measure kinematics and calculated HAMs.
• Integrated CT scans with biomechanical test data using digitized marker locations.

Main Results:

• Successfully replayed and animated in vitro biomechanical tests of a human cervical spine (C2-3 segment) under torsion.
• Animated test replays facilitated intuitive analysis of kinematic data alongside strain data.
• Achieved high accuracy in matching CT and experimental data (RMS errors < 1.0 mm).

Conclusions:

• The developed animation technique improves the interpretation and discussion of complex biomechanical data.
• Enhances interdisciplinary collaboration by making kinematic and associated data more accessible.
• Provides a valuable tool for visualizing and understanding in vitro biomechanical test results.