This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Shoulder and arm injuries, Subject name: Orthopaedics
A 17-year-old high school tennis player sustains a right midshaft clavicle fracture. Which of the following increases the risk of nonunion in the non operative treatment of clavicle fractures 
Select and explain. 
A. Sling treatment, B. Figure-of-eight bandage treatment, C. Displacement and comminution, D. Male sex
C: Displacement and comminution
Answer: C: Displacement and comminution 
Explanation: Displacement and comminution have been shown to increase risk of non-union in nonoperative management. There are no significant differences between outcomes when using sling immobilization versus a figure-of-eight bandage.