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Zhu Y.,Shanghai JiaoTong University | Li J.,Jining Medical University | Tang Y.,Shanghai JiaoTong University | Wang X.,Shanghai JiaoTong University | And 7 more authors.
Medicine (United States) | Year: 2016

Background: Children with severe airway obstruction tend to have a vertical direction of growth, class II malocclusion, and narrow arches. Adenoidectomy and tonsillectomy were recommended for the promotion of balanced dentition growth in these children. The aim of this study was to determine the effect of adenoidectomy and tonsillectomy on the growth of dental morphology in children with airway obstruction. Methods:A comprehensive search of the Medline, Embase, Web of science, and OVID databases for studies published through to January 17, 2016 was conducted. Prospective, comparative, clinical studies assessing the efficacy of adenoidectomy, or tonsillectomy in children with airway obstruction were included. The weighted mean difference (WMD) and 95% confidence interval (CI) were used for continuous variables. Forest plots were drawn to demonstrate effects in the meta-analyses. Results: Eight papers were included in our study. We found that adenoidectomy and tonsillectomy led to a significant change in nasal-breathing in children with airway obstruction. Children with airway obstruction had a significantly narrower posterior maxillary dental arch than children without airway obstruction (WMD=-0.94, 95% CI [-1.13,-0.76]; P<0.001). After surgery, these children still had a significantly narrower dental arch than the nasal-breathing children (WMD=-0.60, 95% CI [-0.79,-0.42]; P<0.001). In terms of dental arch width, malocclusion, palatal height, overjet, overbite, dental arch perimeter, and arch length, a tendency toward normalization was evident following adenoidectomy or tonsillectomy, with no significant differences evident between the surgical group and the normal group. The small number of studies and lack of randomized controlled trials were the main limitations of this meta-analysis. Conclusions: Following adenoidectomy and tonsillectomy, the malocclusion and narrow arch width of children with airway obstruction could not be completely reversed. Therefore, other treatments such as functional training or orthodontic maxillary widening should be considered after removing the obstruction in the airway. Copyright © 2016 the Author(s). Published by Wolters Kluwer Health, Inc. All rights reserved.


Wang J.,Shanghai Key Laboratory of Orthopaedic Implant | Yue B.,Shanghai JiaoTong University | Wang Y.,Shanghai Key Laboratory of Orthopaedic Implant | Wang Y.,Shanghai JiaoTong University | And 2 more authors.
Knee Surgery, Sports Traumatology, Arthroscopy | Year: 2012

Purpose: An unnatural design of the sagittal geometry of the femoral trochlea may cause abnormal patellofemoral kinematics and complications after knee arthroplasty. Most previous studies examined the sagittal curvature of the femoral trochlea on 2D parasagittal planes, which may not represent the true sagittal curvature of the complex 3D femoral trochlea. Methods: The current study evaluated the sagittal geometry of the femoral trochlea of 100 healthy Chinese subjects (50 women and 50 men) with 3D analysis. A close-fit sphere was generated on the surface of the medial and lateral trochlear articular surface, respectively. The radii of the spheres represented the sagittal radii of the femoral trochlear sagittal curvature. A cylinder was then established and its radius was adjusted to allow the deepest points of the curved trochlear groove touching the cylindrical surface. The radius of the cylinder represented the sagittal radius of the trochlear groove. Results: In the men, the average radii of the curvature of the femoral trochlea were 18.8 ± 2.5 mm and 25.5 ± 2.8 mm for the medial and lateral femoral trochleas, respectively. In the women, the average radii of the curvature of the femoral trochlea were 20.2 ± 3.0 mm and 26.6 ± 2.7 mm for the medial and lateral femoral trochleas, respectively. The average radius of the cylinder of the trochlea groove was 19.6 ± 2.0 mm with a circular arc of 123.2° ± 13.0° in the men. In the women, the radius was 20.2 ± 1.7 mm with a circular arc of 127.9° ± 11.7°. Conclusion: The present study provided a reliable and consistent assessment of the sagittal geometry of the femoral trochlea in the Chinese population. The results of the current study may be helpful to improve the understanding of the knee kinematics and develop the physiological knee prostheses. © 2011 Springer-Verlag.


PubMed | Shanghai Key Laboratory of Orthopaedic Implant
Type: Journal Article | Journal: Knee surgery, sports traumatology, arthroscopy : official journal of the ESSKA | Year: 2012

An unnatural design of the sagittal geometry of the femoral trochlea may cause abnormal patellofemoral kinematics and complications after knee arthroplasty. Most previous studies examined the sagittal curvature of the femoral trochlea on 2D parasagittal planes, which may not represent the true sagittal curvature of the complex 3D femoral trochlea.The current study evaluated the sagittal geometry of the femoral trochlea of 100 healthy Chinese subjects (50 women and 50 men) with 3D analysis. A close-fit sphere was generated on the surface of the medial and lateral trochlear articular surface, respectively. The radii of the spheres represented the sagittal radii of the femoral trochlear sagittal curvature. A cylinder was then established and its radius was adjusted to allow the deepest points of the curved trochlear groove touching the cylindrical surface. The radius of the cylinder represented the sagittal radius of the trochlear groove.In the men, the average radii of the curvature of the femoral trochlea were 18.8 2.5 mm and 25.5 2.8 mm for the medial and lateral femoral trochleas, respectively. In the women, the average radii of the curvature of the femoral trochlea were 20.2 3.0 mm and 26.6 2.7 mm for the medial and lateral femoral trochleas, respectively. The average radius of the cylinder of the trochlea groove was 19.6 2.0 mm with a circular arc of 123.2 13.0 in the men. In the women, the radius was 20.2 1.7 mm with a circular arc of 127.9 11.7.The present study provided a reliable and consistent assessment of the sagittal geometry of the femoral trochlea in the Chinese population. The results of the current study may be helpful to improve the understanding of the knee kinematics and develop the physiological knee prostheses.

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