Biomechanical comparison of coracoclavicular reconstructive techniques

Area of Science:

• Orthopaedic Surgery
• Biomedical Engineering
• Sports Medicine

Background:

• Acromioclavicular (AC) joint dislocations are frequent orthopaedic injuries.
• Current fixation methods aim for stability, but a definitive gold standard remains elusive.
• The modified Weaver-Dunn procedure is traditional, yet high rates of recurrent instability prompt exploration of more anatomic repairs.

Purpose of the Study:

• To biomechanically evaluate the performance of various coracoclavicular (CC) ligament reconstruction techniques.
• Compare the load-to-failure and stiffness of different surgical options for AC joint injuries.

Main Methods:

• A controlled laboratory study utilized 30 fresh-frozen human cadaveric shoulders.
• Specimens underwent simulated Type III AC joint dislocations.
• Five reconstruction techniques (modified Weaver-Dunn, nonanatomic allograft, anatomic allograft, anatomic suture, GraftRope) and a control group were tested under cyclic preload and load-to-failure protocols.

Main Results:

• The anatomic allograft reconstruction demonstrated the highest load to failure (948 ± 148 N).
• This was significantly greater than the modified Weaver-Dunn (523.2 ± 98.6 N), anatomic suture (578.2 ± 195.3 N), nonanatomic allograft (591.2 ± 65.6 N), and GraftRope (646 ± 167.4 N) techniques.
• No significant differences in load to failure were observed among the other tested techniques.

Conclusions:

• Anatomic allograft reconstruction exhibits superior initial biomechanical properties over other tested CC ligament repair methods.
• This technique may offer a robust biological solution for AC joint dislocations, potentially reducing re-dislocation and pain.
• Anatomic allograft repair could facilitate earlier rehabilitation compared to existing surgical options.