[Experimental deformation in a bone fixation plate: measurement using holographic interferometry]

Area of Science:

• Orthopedic biomechanics
• Biomaterials science
• Surgical implant technology

Context:

• Investigating mechanical properties of tibia fracture fixation.
• Evaluating different osteosynthesis plate systems (AO and Eggers).
• Simulating physiological loading conditions on human tibia specimens.

Purpose:

• To assess the mechanical properties of tibia fixation with metal plates and screws.
• To analyze the influence of bracing techniques and plate design on fixation stability.
• To compare the fixation capabilities of different plate systems under various forces.

Summary:

• Eight dried human tibias were used with four fixation methods (AO and Eggers plates).
• Bending, torsion, and axial forces were applied, with deformation measured by holographic interferometry.
• Results indicated fixation capability varied by load direction, with screws near the fracture line enhancing stability.

Impact:

• Holographic interferometry revealed detailed 2D bending and twisted deformations in fixation plates.
• Findings provide insights into optimizing plate design and screw placement for improved tibia fracture fixation.
• The study highlights the importance of load direction in assessing the performance of osteosynthesis devices.