Comparative Biomechanical Analysis of Two Olecranon Osteotomy Fixation Techniques

Area of Science:

• Orthopedic Surgery
• Biomechanical Engineering
• Trauma Surgery

Background:

• Olecranon osteotomy is a common procedure for treating complex elbow fractures.
• Effective fixation is crucial for restoring elbow function and preventing complications.
• Transcortical (TC) and intramedullary (IM) screws are two methods for olecranon osteotomy fixation.

Purpose of the Study:

• To compare the biomechanical characteristics of olecranon osteotomy fixation using transcortical (TC) versus intramedullary (IM) screws.
• To evaluate the stability, rigidity, and load-bearing capacity of each fixation technique.

Main Methods:

• Synthetic polyurethane ulnas were used to simulate Chevron osteotomies.
• Fixation was performed using either TC screws (n=11) or IM screws (n=11).
• Specimens underwent cyclic loading (10-500 N) followed by monotonic tensile loading to failure, measuring gap formation, maximum force, stiffness, and failure mode.

Main Results:

• No significant difference in osteotomy gap formation was observed between TC and IM groups after cyclic loading (p=0.9420).
• The maximum failure force was 1.27 times greater in the IM screw group compared to the TC screw group (p=0.0459).
• System stiffness was comparable between the two fixation methods (p=0.670).

Conclusions:

• Both TC and IM screw fixation techniques are effective for olecranon osteotomy, providing adequate stability and rigidity.
• Intramedullary screw fixation demonstrated a superior load-bearing capacity before failure, indicating enhanced mechanical strength.
• These findings may inform clinical decisions regarding the optimal fixation method for olecranon osteotomies.