Monoaxial Mechanical Tests on Porcino Knee Ligaments

Area of Science:

• Biomechanical Engineering
• Orthopedic Research
• Tissue Mechanics

Background:

• Ligament reconstruction failure is linked to mechanical vulnerability during incorporation.
• Living tissues exhibit time-dependent loss of resistance.
• Standard dissection methods lack bone insertions, limiting biomechanical analysis of cruciate ligaments.

Purpose of the Study:

• To describe a novel dissection technique for porcine knee ligaments, maintaining bone insertions.
• To generate test bodies for nondestructive mechanical evaluation.
• To assess the viscoelastic behavior and time-dependent properties of knee ligaments.

Main Methods:

• Dissection of four porcine knee ligaments, focusing on cruciate ligaments with bone inserts.
• Application of a posterior approach to preserve native bone insertions.
• Performance of monotonic uniaxial relaxation tests with strain gauge validation.

Main Results:

• The described dissection technique successfully preserved bone insertions for mechanical testing.
• Porcine knee ligaments exhibited viscoelastic behavior, confirmed by strain gauges.
• A time-dependent loss of resistance, up to 20% in some ligaments, was observed.

Conclusions:

• The developed dissection method enables reliable biomechanical testing of knee ligaments.
• Viscoelastic properties and strength loss over time are significant factors in ligament mechanics.
• Findings provide critical data for improving ligament reconstruction strategies and understanding failure mechanisms.