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Effectiveness of Diagnosis and Treatment of Spiral Fracture of the Distal Third of the Tibia Combined with Posterior Malleolus Fracture
A Series of Ten Cases
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Background:
Spiral fractures of the tibia are often the result of torsion trauma. In clinical practice, this type of fracture is frequently complicated by posterior malleolus fractures. This study aimed to observe the effectiveness of diagnosis and treatment of these fractures in a single hospital in China. Posterior malleolus fractures are sometimes occult, occurring alongside spiral fractures of the distal third of the tibia; posttraumatic arthritis can result if they are missed.
Methods:
This study includes 128 consecutive patients with tibia fractures between May 1, 2008, and April 30, 2012. Patients in the early study period underwent radiography only, and subsequent patients underwent both radiography and computed tomography (CT). The causes of the fractures were evaluated. Intramedullar nailing was performed for the tibia fractures. Percutaneous cannulated screw fixation was used for the posterior malleolus fractures. Patients were followed up for a minimum of 3 months.
Results:
Twenty-eight patients had spiral fractures of the mid-distal third of the tibia. Ten of the 28 patients were complicated by posterior malleolus fractures. Diagnosis was initially missed in one early patient who underwent radiography only. Three cases of posterior malleolus fractures were identified by radiography. A CT was performed in all ten patients and showed that approximately 25% to 50% of the ankle joint surface of posterior malleolus fractures was involved. One early diagnosis was missed that had a displaced posterior malleolus fracture after intramedullary nailing. Using CT as the gold standard, radiography had sensitivity of 33.3%, specificity of 100.0%, positive predictive value of 100%, and negative predictive value of 73.9%. All correctly diagnosed patients healed well, without ankle pain.
Conclusions:
Computed tomography helped identify most posterior malleolus fractures, and radiography alone might miss it. Intramedullary nailing and posterior malleolus screw fixation were straightforward and effective treatments.
