Orthopedics High Yield Points
MONTEGGIA FRACTURE DISLOCATION MONTEGGIA FRACTURE DISLOCATION This is a fracture of the upper-third of the ulna with dislocation of the head of the radius. It is caused by a fall on an out-stretched hand (hyperpronation injury). May also result from a direct blow on the back of the upper forearm. Fractures b/w the proximal third of the ulna and the base of olecranon combined with an anterior dislocation of the proximal radio ulnar joint. Epidemiology: rare in adults more common in children with peak incidence between 4 and 10 years of age TYPES 2 main categories depending upon the angulation of the ulna fracture – extension and flexion type. The extension type , is the commoner of the two, where the ulna fracture angulates anteriorly ( extends) and the radial head dislocates anteriorly. The flexion type is where the ulna fracture ...