Biomechanical Comparison of Distal Radioulnar Joint Reconstruction Graft Preparation Techniques

Area of Science:

• Orthopedic surgery
• Biomechanical engineering
• Materials science

Background:

• Graft preparation techniques for Adams-Berger distal radioulnar joint (DRUJ) reconstruction lack standardized evidence.
• Variability in surgical techniques necessitates biomechanical evaluation.

Purpose of the Study:

• Compare survival rates under cyclic loading for four graft preparation techniques.
• Evaluate absolute elongation, elongation rate, and failure modes of different graft preparations.

Main Methods:

• Fifteen porcine extensor tendons were prepared as: tendon only, tendon with suture at 6mm intervals, tendon with suture at 12mm intervals, and suture only.
• Samples underwent a staircase cyclic loading protocol using a mechanical testing machine.
• Failure modes were visually inspected, and survival, elongation, and elongation rate were compared.

Main Results:

• Suture-augmented tendons showed significantly higher survival rates compared to tendon-only grafts.
• All tendon groups exhibited significantly higher survival than suture-only samples.
• Suture augmentation resulted in a significantly lower elongation rate compared to all tendon groups.

Conclusions:

• Augmenting porcine tendons with suture significantly increases survival for DRUJ reconstruction under cyclic loading.
• Nonabsorbable braided suture augmentation provides biomechanical superiority over tendon-only grafts for Adams-Berger reconstruction.