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Are Outcomes of Bimalleolar Fractures Poorer Than Those of Lateral Malleolar Fractures with Medial Ligamentous Injury?

¹ Department of Orthopaedic Surgery, New York University Hospital for Joint Diseases, 550 First Avenue, NBV 21W 37, New York, NY 10016. E-mail address for N.C. Tejwani: Nirmal.tejwani{at}med.nyu.edu
² Dartmouth Hitchcock Medical Center, 1 Medical Center Drive, Lebanon, NH 03756

Investigation performed at the Department of Orthopaedic Surgery, New York University Hospital for Joint Diseases, New York, NY

Disclosure: The authors did not receive any outside funding or grants in support of their research for or preparation of this work. Neither they nor a member of their immediate families received payments or other benefits or a commitment or agreement to provide such benefits from a commercial entity. No commercial entity paid or directed, or agreed to pay or direct, any benefits to any research fund, foundation, division, center, clinical practice, or other charitable or nonprofit organization with which the authors, or a member of their immediate families, are affiliated or associated.

Methods: Demographic data on 456 patients in whom an unstable fracture of the ankle was treated surgically were entered into a database and the patients were prospectively followed. Two hundred and sixty-six of these patients sustained either a bimalleolar fracture or a lateral malleolar fracture with insufficiency of the deltoid ligament and widening of the medial clear space. No medial fixation was used in the patients with a deltoid ligament injury. All patients followed a similar postoperative protocol. The patients were followed clinically and radiographically at three, six, and twelve months after the surgery. Function was assessed with the Short Musculoskeletal Function Assessment and the American Orthopaedic Foot and Ankle Society score.

Results: Bimalleolar fractures were more commonly seen in female patients, in those older than sixty years of age, and in patients with more comorbidities. There was no significant association between the fracture pattern and either diabetes or the length of the hospital stay. At a minimum of one year postoperatively, the patients with a bimalleolar fracture had significantly worse function, even after we controlled for all other variables. The overall complication rate, including elective hardware removal, was also higher in the group with a bimalleolar fracture (seventeen compared with nine patients).

Conclusions: At one year after surgical stabilization of an unstable ankle fracture, most patients experience little or mild pain and have few restrictions in functional activities. However, the functional outcome for those with a bimalleolar fracture is worse than that for those with a lateral malleolar fracture and disruption of the deltoid ligament, possibly because of the injury pattern and the energy expended.

Level of Evidence: Prognostic Level I. See Instructions to Authors for a complete description of levels of evidence.

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