Fracture of the proximal or middle third of the ulna with posterior dislocation of the radial head (70 to 80% of adult Monteggia fractures)
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A 12-year-old male sustains an ulnar fracture with an associated posterior-lateral radial head dislocation. After undergoing closed reduction, the radiocapitellar joint is noted to remain non-concentric. What is the most likely finding?
Lateral ulnar collateral ligament disruption
Anterior band of the medial collateral disruption
Posterior band of the medial collateral ligament disruption
Annular ligament interposition
Anconeus muscle interposition
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A 45-year-old male falls off his motorcycle and injures his arm. AP and lateral radiographs reveal a proximal ulnar shaft fracture, 30 degrees apex anterior, and a radial head dislocation. Which direction is the radial head most likely dislocated?