Bone plate-screw constructs for osteosynthesis - recommendations for standardized mechanical torsion and bending...

Area of Science:

• Biomechanical Engineering
• Orthopedic Surgery
• Materials Science

Background:

• Biomechanical testing of bone plates is crucial for osteosynthesis.
• Existing methods lack standardization, hindering comparative analysis.
• A recent systematic review highlighted the need for standardized test parameters.

Purpose of the Study:

• To develop and recommend standardized quasi-static and dynamic testing methods for bone plate-screw constructs.
• To establish product-specific characteristics of mechanical constructs under defined conditions.
• To address specific testing requirements for standardization, including positioning and screw configuration.

Main Methods:

• Developed standardized quasi-static and dynamic testing methods based on ASTM F382 and ISO 9585.
• Included torsion and bending tests along the implant axis for various plate types (linear, anatomical, locked, conventional).
• Defined specific test setups to evaluate construct stiffness, yield strength, ultimate strength, and fatigue properties.

Main Results:

• Presented standardized test specifications for biomechanical evaluation of bone plate-screw constructs.
• Defined outcome parameters and failure criteria for comparative quasi-static and dynamic testing.
• Provided recommendations for construct positioning and screw usage in diaphysis and metaphysis.

Conclusions:

• The study provides the first recommendations for standardized mechanical testing of bone plate-screw constructs for osteosynthesis.
• The proposed methods aim to enhance comparability and reliability of biomechanical test results.
• These standards are intended to guide the evaluation of implant performance in a simulated healthy bone environment.