Which part of the clavicle is most commonly fractured? A. Lateral B. Middle C. Medial D. Superior Which part of the clavicle is most commonly fractured? A. Lateral B. Middle C. Medial D. Superior A. Lateral B. Middle C. Medial D. Superior Solution Clavicle fracture is also called the collarbone fracture. The most common ite for the collarbone fracture is at the junction of the medial two-thirds and the lateral one-third. So, the most appropriat eanswer is medial part of the clavicle..