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Both-Bone Forearm Fracture with Distal Radioulnar Joint Dislocation

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Both-Bone Forearm Fracture with Distal Radioulnar Joint Dislocation A Case Report & Literature Review Both-Bone Forearm Fracture With Distal Radioulnar Joint Dislocation Michael K. Ryan, MD, Brendan J. MacKay, MD, and Nirmal C. Tejwani, MD and a concomitant ipsilateral DRUJ dislocation, and we review Abstract the literature on this uncommon injury pattern. Both-bone forearm fractures, also known as The patient provided written informed consent for print concomitant diaphyseal radius and ulna frac- and electronic publication of this case report. tures, and distal radioulnar joint (DRUJ) disloca- tions are each uncommon injuries in adult upper Case Report extremity trauma. DRUJ dislocations are more A 38-year-old man with no past medical history presented to often associated with radial shaft (Galeazzi) the emergency department after being thrown from a motor- fractures. In this article, we report the case of cycle. On arrival, he reported bilateral upper extremity pain. a patient who sustained a both-bone forearm Physical examination revealed closed deformities of the left fracture and DRUJ dislocation, and we review forearm and right wrist. Radiographs of the left upper extrem- the literature on this unique injury pattern. ity showed mid-diaphyseal radius and ulna fractures and a DRUJ dislocation (Figure 1). Radiographs of the right upper extremity showed a comminuted radial styloid fracture and widening of the scapholunate interval with dorsal interca- iaphyseal forearm fractures are relatively rare in or- lated segment instability deformity of the carpus. Both upper thopedic trauma, accounting for only 0.9% of all frac- extremity injuries were acceptably reduced and splinted. The 1 AJO Dtures. Both-bone forearm fractures, also known as patient also had a left-side subarachnoid hematoma, which concomitant diaphyseal radius and ulna fractures, are even was stable on serial computed tomography without contrast. more uncommon, comprising 21.7% of diaphyseal forearm After the patient was medically stabilized, the fractures fractures.1 Distal radioulnar joint (DRUJ) dislocations occur were surgically repaired. Radius and ulna were reduced and infrequently as well. Investigators have cited a 6% to 55% in- compression-plated through separate incisions. After stable cidence of DRUJ dislocations associated with diaphyseal radius fixation was achieved, intraoperative elbow range of motion fractures,DO and the rate is higher forNOT fractures closer to the distal (ROM) wasCOPY full, with 90° of supination and pronation. On radial articular surface.2,3 physical examination, the DRUJ was stable with the forearm in Both conditions have similar mechanisms of injury including neutral, pronation, and supination. Postoperative radiographs falls, blunt trauma, sports, and motor vehicle accidents. Inde- showed well-reduced radius, ulna fractures, and DRUJ. A long pendently, the 2 injury patterns have been thoroughly described arm splint was placed with the wrist in supination. in the literature, but there are only isolated reports—most recently Figure 1. Lateral (A) and oblique (B) radiographs of left forearm show shortened, rotated, and displaced in 19754—of concomi- diaphyseal fractures of radius and ulna. (C) Posteroanterior radiograph of left wrist shows distal radioulnar tant both-bone forearm joint dislocation, joint widening, and distal displacement of ulna. (D) Lateral radiograph of left wrist shows dorsal dislocation of distal ulna. (E) Oblique radiograph of left wrist. fractures and ipsilateral DRUJ dislocations. In A B C D E these reports, the infor- mation on fracture pat- terns, treatments, and functional outcomes is limited. In this article, we re- port the case of a both- bone forearm fracture Authors’ Disclosure Statement: The authors report no actual or potential conflict of interest in relation to this article. E30 The American Journal of Orthopedics® May 2013 www.amjorthopedics.com A Case Report & Literature Review For 6 weeks, the patient wore a functional brace on forearm perfect alignment, no loss of length, no DRUJ subluxation, no and elbow to keep the forearm in supination. Eleven weeks limitation in elbow or wrist function, and no limitation in after surgery, radiographs showed healing fractures and a well- pronation or supination. reduced DRUJ. At most recent follow-up (6 months), forearm There is no definitive explanation for the low incidence and wrist had limited ROM, elbow had full ROM, and there of both-bone forearm fractures concomitant with ipsilateral was radiographic evidence of fracture healing and a stable DRUJ dislocations. DRUJ dislocations in Galeazzi fractures oc- DRUJ (Figure 2). cur more often when the radial shaft fracture occurs within 7.5 cm of the radial articular surface (55%), compared with Discussion fractures proximal to this point (6%).3 Both-bone forearm DRUJ dislocations co-occurring with diaphyseal radius frac- fractures occur most often in the proximal and middle thirds tures have been recognized for nearly 200 years, but it was not of the forearm (82% and 72%, respectively).8 Therefore, the until 1949 that Knight and Purvis5 first proximal-to-distal decrease in the in- described a both-bone forearm fracture cidence of diaphyseal shaft fractures is co-occurring with an ipsilateral DRUJ A B accompanied by an increase in the inci- dislocation. The authors reported on 100 dence of DRUJ dislocations. This may be cases of both-bone forearm fractures—41 the result of biomechanical differences managed with closed reduction and in these injury patterns. splinting in supination and the other 59 Mikić4 and Hughston9 separately de- managed with open reduction and dif- scribed the path of force transmission in ferent internal fixation techniques—and Galeazzi fractures as originating in the found unsatisfactory outcomes in 71% of hand, traveling through the radius, con- those treated closed and in 40% to 85% of tinuing through the interosseous mem- those treated with open reduction inter- brane, and exiting at the triangular fibro- nal fixation (ORIF). They also noted that, cartilage complex. Mikić used a variation though axial subluxation of the DRUJ was of this theory to explain both-bone fore- Figure 2. Six months after surgery, common in both-bone forearm fractures posteroanteriorAJO (A) and lateral (B) radio- arm fractures concomitant with ipsilater- secondary to radial shortening, DRUJ in- graphs of left forearm show interval heal- al DRUJ dislocations. He postulated that stability and pain seldom occurred, unless ing of radius and ulna fractures. the same force causing Galeazzi fractures there was volar or dorsal dislocation of the also propagates through the ulna, causing radius or ulna. mechanical failure. In 1963, Albert and colleagues6 reported DRUJ dislocation However, Rettig and Raskin2 stated that different mecha- in association with a 1- or 2-bone diaphyseal fracture in 7 of nisms are involved in diaphyseal fractures of the distal third of 60DO forearm fracture cases, but gaveNOT no other pertinent details. the radius andCOPY diaphyseal fractures of the middle and proximal In 1967, Vesely7 conducted a comprehensive review of the thirds. Fractures of the distal third (ie, within 7.5 cm of the DRUJ and identified 201 cases of forearm injuries managed midarticular surface) are “high-impact hyperextension frac- over a 5-year period. These included distal radius fractures and tures [resulting] in a direct continuum of injury through the isolated joint dislocations without fracture. Thirteen of these in- triangular fibrocartilage complex and the interosseous mem- juries were mid-diaphyseal both-bone fractures, and 6 of these brane,” whereas forearm fractures beyond 7.5 cm from the 13 had associated ipsilateral DRUJ dislocations. The authors did midarticular surface (moving more proximally) result from not report details regarding management or outcomes. an “indirect pronation force with incomplete soft-tissue dis- In 1975, Mikić4 evaluated 125 Galeazzi or Galeazzi-type ruption.” Independent of the mechanism involved in these fractures managed over a 10-year period. Mikić coined the injury patterns, the interosseous membrane plays a vital role term Galeazzi-type fracture to describe a both-bone forearm frac- in the function, stability, and force dissipation of the forearm. ture with an associated ipsilateral DRUJ dislocation. Twenty- Any disruption in this membrane places excessive loads on five of these injuries were both-bone forearm fractures with either the DRUJ or the proximal radioulnar joint and makes concomitant ipsilateral DRUJ dislocations. Four of these 25 it vulnerable. were unsuccessfully managed with closed reduction and cast- Both-bone forearm fractures and Galeazzi fractures histori- ing, and the other 21 were managed with a variety of surgical cally have been managed with a variety of methods. Initially, techniques. Forty-five percent of the surgical cases had poor the technique of closed manipulation and immobilization was outcomes (ie, pain, deformity, nonunion, shortening, or angu- advocated for management of both-bone forearm fractures, as lation of the radius; DRUJ dislocation; pronation or supination surgical intervention often yielded high rates of infection, de- limitation of >45°; and excessively restricted elbow or wrist layed union, malunion, and residual DRUJ instability.5,10 When function). The authors reported 3 excellent outcomes, all in surgical techniques and implants improved, attitudes shifted cases managed with radioulnar transfixation using Kirsch- toward making operative fixation the primary treatment, as ner wires.
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