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Intraoperative Ultrasound Control of Zygomatic Arch Fractures: Does Additional Imaging Improve Reduction Quality?
Journal of Oral and Maxillofacial Surgery 2018 November 28
PURPOSE: Intraoperative navigation to assess anatomic reduction is the general trend in maxillofacial trauma surgery. The aim of this study was to evaluate the closed reduction outcome of isolated zygomatic arch fractures using ultrasound compared with palpation control.
MATERIALS AND METHODS: In this case-and-control study, the authors identified consecutively treated patients who underwent closed reduction of isolated zygomatic arch fractures using the Volkmann reposition hook with intraoperative ultrasound. Controls were patients with the same diagnosis and surgical procedure without ultrasound imaging. Pre- and postoperative radiographic datasets were geometrically analyzed. The outcome variables postoperative cortical step, persistent postoperative displacement, and overall grade of reduction were compared in the 2 study groups. Subgroups of fracture patterns were classified as M-shaped or variable. Statistical analysis was performed using t test for continuous variables and 2-sided χ2 test for categorical variables, with a P value less than .05 defined as significant.
RESULTS: Sixteen cases with intraoperative ultrasound and 60 controls were identified from the institution's database. The angle of postoperative displacement was significantly decreased in the ultrasound group for all fractures (2.4° vs 5.3°; P = .004) and the variable fracture type (1.6° vs 8.1°; P = .005). Overall grade of reduction was improved in the ultrasound group for all fractures (P = .03) but with no difference solely for M-shaped fractures (P = .37).
CONCLUSIONS: Although reduction control using palpation and probing using the Volkmann hook showed satisfactory results for M-shaped fractures, additional intraoperative ultrasound imaging showed promise for increasing success rates for the variable type of zygomatic arch fracture.
MATERIALS AND METHODS: In this case-and-control study, the authors identified consecutively treated patients who underwent closed reduction of isolated zygomatic arch fractures using the Volkmann reposition hook with intraoperative ultrasound. Controls were patients with the same diagnosis and surgical procedure without ultrasound imaging. Pre- and postoperative radiographic datasets were geometrically analyzed. The outcome variables postoperative cortical step, persistent postoperative displacement, and overall grade of reduction were compared in the 2 study groups. Subgroups of fracture patterns were classified as M-shaped or variable. Statistical analysis was performed using t test for continuous variables and 2-sided χ2 test for categorical variables, with a P value less than .05 defined as significant.
RESULTS: Sixteen cases with intraoperative ultrasound and 60 controls were identified from the institution's database. The angle of postoperative displacement was significantly decreased in the ultrasound group for all fractures (2.4° vs 5.3°; P = .004) and the variable fracture type (1.6° vs 8.1°; P = .005). Overall grade of reduction was improved in the ultrasound group for all fractures (P = .03) but with no difference solely for M-shaped fractures (P = .37).
CONCLUSIONS: Although reduction control using palpation and probing using the Volkmann hook showed satisfactory results for M-shaped fractures, additional intraoperative ultrasound imaging showed promise for increasing success rates for the variable type of zygomatic arch fracture.
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