Tension and motion measurement for extended trochanteric osteotomy with different fixation methods

Area of Science:

• Orthopedic Surgery
• Biomedical Engineering
• Biomechanics

Background:

• Revision total hip arthroplasty (THA) is a growing procedure worldwide.
• Extended trochanteric osteotomy (ETO) is a key technique in revision THA.
• Existing biomechanical stability data for ETO fixation methods are limited.

Purpose of the Study:

• To develop and validate a novel synchronous testing approach for evaluating the biomechanical stability of ETO fixation in revision THA.
• To compare the stability of five different ETO fixation methods using this new approach.

Main Methods:

• A synchronous testing system was designed to measure tension and fragment displacement/rotation.
• Active markers were used for precise 3D tracking of the osteotomy fragment and femur.
• Six cadaver femurs were used to test five fixation methods (2 wires, 3 wires, 2 wires + short claw plate, 2 cables + short claw plate, long claw plate) in a randomized order.

Main Results:

• Preliminary data on fragment displacement and femur stiffness following ETO with different fixation methods were obtained.
• The novel testing approach successfully acquired tension and motion data, overcoming limitations of traditional methods.

Conclusions:

• The developed synchronous testing approach provides a viable method for assessing ETO fixation biomechanics.
• Further research is needed to discuss the clinical significance of these biomechanical findings for revision THA outcomes.