Biomechanical Comparison of Fixation Methods for Posterior Wall Fractures of the Acetabulum: Conventional...

Area of Science:

• Orthopedic Surgery
• Biomechanics
• Trauma Care

Background:

• Acetabular fractures, often from high-energy trauma, pose treatment challenges.
• Posterior wall fractures are common and generally have better prognoses.
• Anatomical reduction and stable fixation are key for optimal outcomes.

Purpose of the Study:

• To biomechanically compare three fixation methods for posterior acetabular wall fractures.
• Methods compared: conventional reconstruction plate, spring plate, and 2.7 mm variable angle locking compression plate (VA-LCP).
• Evaluation of fracture gap, stiffness, and displacement under simulated physiological loading.

Main Methods:

• Utilized 12 fresh-frozen cadaveric hemipelvises.
• Created a simple posterior wall acetabular fracture model.
• Performed quasi-static and cyclic loading tests simulating walking.

Main Results:

• No significant differences in fracture gap among the three fixation methods under cyclic loading.
• Conventional reconstruction plate demonstrated greater stiffness than spring and VA-LCP plates.
• Fatigue analysis showed no significant differences in stability throughout cyclic loading.

Conclusions:

• All three fixation methods (conventional reconstruction plate, spring plate, VA-LCP) provide sufficient stability for posterior acetabular fractures under simulated walking conditions.
• The conventional reconstruction plate offers superior stiffness, but all methods are adequate.
• Variable angle plates offer appropriate stability for fragment-specific fixation, supporting their surgical use.