Lateral clavicle fracture with coracoclavicular ligament injury: a biomechanical study of 4 different repair techniques

Purpose To investigate the biomechanical performance of four different methods used for coracoclavicular (CC) ligament reconstruction in a lateral clavicle fracture repair. Methods Native displacement, translation, and rotation at the acromioclavicular joint of 24 fresh-frozen cadaveric shoulders were tested. A reproducible fracture in the lateral third of the clavicle was created by dissecting both CC ligaments. Each specimen was then repaired with plate fixation of the fracture and the following CC repair technique: (1) Cortical button. (2) Suture anchor and plate button. (3) Suture anchor no plate button, and (4) Suture around coracoid. All reconstructed specimens were then re-tested for displacement, translation, and load to failure, and compared to their native results. Groups 1 and 3 were investigated for rotational load. Results There was no difference in load to failure between the repaired groups ( p : ns). Group 1 showed less superior and anterior translations ( p < 0.05). Group 2 showed significantly less superior translation ( p = 0.003), but no significance with anterior and posterior translations to the native joint. Group 3 showed less superior and posterior translations ( p = 0.005 and p = 0.039). Anterior and posterior translations were increased in group 4 ( p < 0.05). Conclusion The biomechanical analyses did not show any significance in load to failure or displacement after cyclic loading among the study groups. All repairs were effective in preventing superior translation. Groups 1 and 2 demonstrated increased horizontal stability compared to the native state. All 4 methods are clinically viable options for CC ligament repair.