Compression force and pullout strength comparison of bioabsorbable implants for osteochondral lesion fixation

Area of Science:

• Orthopedic biomechanics
• Biomaterials science
• Surgical device engineering

Background:

• Bioabsorbable nails and screws are increasingly used in orthopedic surgery.
• Understanding the mechanical properties of these devices is crucial for clinical success.
• Limited comparative data exists for the mechanical performance of various commercially available bioabsorbable fixation devices.

Purpose of the Study:

• To characterize and compare the compression forces and pullout strengths of four different bioabsorbable nails and screws.
• To evaluate the mechanical performance of these devices in a standardized synthetic bone model.

Main Methods:

• Four commercially available bioabsorbable nails and screws were tested.
• Peak compression forces were measured using a piezoelectric sensor.
• Maximum pullout strengths were determined using a material testing machine.
• Testing was performed in a synthetic bone model to simulate in vivo conditions.

Main Results:

• SmartScrew exhibited the highest compression force (12.7 N) and pullout strength (530 N).
• Significant differences (P<.05) in both compression force and pullout strength were observed among the tested devices.
• LactoNail showed the lowest compression force (8.5 N) and pullout strength (189 N).

Conclusions:

• SmartScrew demonstrated superior mechanical performance in terms of compression force and pullout strength within this synthetic bone model.
• The study highlights significant variations in mechanical properties among different bioabsorbable fixation devices.
• These findings have implications for selecting appropriate bioabsorbable implants based on mechanical requirements in orthopedic procedures.