This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Ohopaedics Q Bank, Subject name: Orthopaedics
Monteggia fracture is a: 
Select and explain. 
A. Fracture of atlas, B. Fracture of radial styloid, C. Fracture of proximal 1/3 of ulna with dislocation of proximal radioulnar joint, D. Fracture of distal 1/3 of radius with dislocation of distal radioulnar joint
C: Fracture of proximal 1/3 of ulna with dislocation of proximal radioulnar joint
Answer: C: Fracture of proximal 1/3 of ulna with dislocation of proximal radioulnar joint 
Explanation: Fractures between the proximal third of the ulna and the base of olecranon combined with dislocation of the proximal radio-ulnar joint. Direction of dislocation of radial head is used for classification. Bado's classification is used to classify monteggia fracture