Date of Award


Degree Type


Degree Name

Master of Science


Medical Biophysics


Graham King

Second Advisor

Jim Johnson


Coronoid fractures often occur in association with ligament injuries. There are limited biomechanical studies investigating these injuries. This thesis describes three studies investigating coronoid fractures and associated ligament injuries. In the first study, an in-vitro elbow motion simulator was utilized to examine the role of posterior bundle of the medial collateral ligament (PMCL). The PMCL was found to contribute to varus and rotational stability. A second in- vitro study suggests that when type-II fractures, involving 50% of the coronoid height, are not amenable to stable internal fixation, initial elbow stability can be achieved with transosseous suture ligament repair only, z Finally, a third in-vitro study demonstrated that isolated LCL repair can provide initial stability with displaced 2.5 mm subtype-1 anteromedial facet fractures. However, 5 mm subtype-I to III fractures demonstrated varus and rotational instability even with the LCL repaired, suggesting that internal fixation is required.



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