PMC8842675_01
(A,B) X-ray images at initial examination. Bado type III Monteggia fracture and ipsilateral distal forearm fracture were observed. (C,D) Following initial traction, the radial axis did not pass the midpoint of the humeral capitulum (black arrow). (E) Intraoperative radiographs demonstrated good alignment of the fracture. (F) One year after surgery.
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F1
X-ray films indicated fractures of the distal ulna and radius and proximal ulna, with lateral dislocation of the radial head (Figures 1A,B). After reviewing additional X-rays, it was found that radial head dislocation remained, with poor alignment of the right forearm fracture reduction (Figures 1C,D). Intraoperative fluoroscopy indicated that the humeroradial joint was well-positioned, and dislocation of the radial head was corrected (Figure 1E). The plate was removed 1 year after surgery (Figure 1F).
Mechanism of this type of injury.
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F2
In the present case, analysis of X-ray images revealed that vertical impact from falling had fractured the distal forearm (Figure 2A), with the force conducting upward along the radius and ulna, respectively, causing dislocation of the radial head and compression fracture of the proximal ulna. Because the radius was pronated, vertical force often results in anterolateral dislocation of the radial head, or even fracture (Figure 2B).