Morphology and surgical treatment of posterior Monteggia fracture with associated ulnohumeral dislocation / 中华骨科杂志

ABSTRACT

Objective To investigate the morphological properties of posterior Monteggia lesion with associated elbow dislocation,to propose its injury mechanism,and to present its surgical methods and its outcomes.Methods The injury mechanism,radiographs and surgical records of patients with posterior Monteggia fractures and associated elbow dislocation were retrospectively reviewed from January 2011 to December 2013.11 patients were included,with 43.3 years old on average.10 were resulted from high-energy injuries.According to the Jupiter classification,Ⅱ A fracture-dislocation 9 cases,Ⅱ B fracture-dislocation 1 case and Ⅱ C fracture-dislocation 1 case.The general medical data,morphological properties,and the surgical methods.Functional outcomes were followed up.Results These cases had several intrinsic morphologic featuresfractures of the coronoid tip and its anteromedial aspect;dislocation of the olecranon from the trochlear notch;fracture of the radial head and disruption of the lateral collateral ligament;a normal proximal radioulnar joint.Operation was carried out with emphasis on elbow stability restoration.All patients underwent the primary operations in the supine position and a routine posterior approach was used.An additional anterior approach was used in 1 case (Ⅱ B).The coronoid tip was first fixed,followed by the anteromedial coronoid fragment,the radial head,the olecranon,and then the LCL.An anatomic olecranon plate was used as the fundamental fixation device.Anteromedial coronoid fractures were mostly fixed with a T-shaped metacarpal plate.The coronoid tip fractures were fixed with screw,Kwire or suture,and the injured LCL was repaired with suture anchors.Ten of the 11 patients were followed up with a mean period of 22.7 months.The extension-flexion motion ranged from 45°-140° (104° average),and the pronation-supination motion ranged from 45° 180° (128° average).According to the Broberg and Morrey functional index,the excellent to good ratio was 70％.Conclusion Patients with posterior Monteggia fracture and associated ulnohumeral dislocation have small and comminuted coronoid fractures,and mostly have a normal PRUJ relationship.It might experience a different mechanism to those of the posterior Monteggia fracture without elbow dislocation.Emphases should be address to restore the rotation stability of the elbow when operation.