Biomechanical Analysis and Injury Prediction in Pilots With Lumbar Spondylolysis Under Different Seat Inclination...

Area of Science:

• Biomechanics
• Aerospace Engineering
• Orthopedic Surgery

Background:

• Pilot lumbar spine injuries are a concern during fighter aircraft maneuvers.
• Spondylolysis, a defect in the vertebral bone, can affect pilots.
• Understanding biomechanical responses to seat inclination is crucial for pilot safety.

Purpose of the Study:

• To quantify the biomechanical effects of varying seat inclinations on pilot lumbar spines.
• To assess risks associated with normal and spondylolysis lumbar conditions under G-loads.
• To provide data for optimizing lumbar protection and seat design.

Main Methods:

• Developed 3D finite element lumbar models for normal and spondylolysis (L5) conditions.
• Validated models using mesh convergence and vertebral range of motion/impact experiments.
• Simulated fighter aircraft maneuvers (pull-up, hovering) at 17° and 22° seat inclinations.

Main Results:

• Biomechanical responses remained below injury thresholds for all models and seat angles.
• A 22° seat inclination showed a higher risk for pilots with spondylolysis.
• Spondylolysis status significantly influences lumbar biomechanical response to seat angle.

Conclusions:

• Findings support optimizing seat design for fighter pilots, especially those with spondylolysis.
• Provides a theoretical basis for enhanced lumbar protection strategies.
• Highlights the importance of considering individual spinal conditions in aviation ergonomics.