<prompt> Posterior interosseous nerve is injured inPosterior dislocation of elbowMonteggia fracture dislocationReversed monteggia fracture dislocationSupracondylar fracture of humerus  <response>: B i.e. Montegia fracture dislocation Monteggia Fracture Dislocation Fractures between the proximal third of the ulna and the base of olecranonQ combined with an anterior dislocation of the proximal radio ulnar jointQ. - Definition by Monteggia 1814 Bado extended Monteggias original description to include- any fracture of ulna with associated dislocation of the proximal radio - ulnar rdio - capitellar jointQ including trans olecranon fractures in which the proximal radio - ulnar joint remains intact. New definition Mn: 3 M : Monteggia - Medial bone ulna fracture - Mountain upper radio - ulnar joint dislocation. Bados Classification Type Direction of radial head dislocation Direction of apex of ulnar shaft fracture angulation I most commonQ AnteriorQ AnteriorQ II Posterior Posterior III Lateral Lateral IV Anterior - Fracture of both radius ulna - Radius is fractured in proximal third below the biceptal groove Treatment - The clue to successful treatment is to restore the length of the fractured ulna; only then can the dislocated joint be fully reduced remain stable In adults it means an operationQ - Rigid anatomical fixation by plating DCPLCDCP is the method of choiceQ. Posterior interosseous nerve has been most commonly injured nerve in forearm fractures, paicularly in association with Monteggia fracture dislocationQ. 