Application of Modified Intraoperative Axillary Fluoroscopy for Posterior Acromioclavicular Joint Dislocation / 中山大学学报(医学科学版)

ObjectiveThe study aims to determine whether the horizontal posterior displacement of the distal clavicle in patients with acromioclavicular joint dislocation can be corrected via the application of modified intraoperative axillary fluoroscopy. MethodsFrom February 2019 to April 2021， 50 patients with Rockwood type Ⅲ acromioclavicular joint dislocation eligible for inclusion were randomly divided into two groups： the normal （32 cases） and the experimental （18 cases）. The conventional anteroposterior position radiographs were obtained to detect the surgery effect on the patients in the normal group. In experimental group， modified intraoperative axillary radiographs were obtained， with the concept of polar coordinates introduced to reduce the horizontal posterior translation of the clavicle. Then we compared the perioperative parameters， such as average operative time， intraoperative blood loss between the two groups. The Constant score was used for assessing the postoperative function of the shoulder joint in the follow-up visits. ResultsNo statistically significant difference was found in gender， age， duration of injury， underlying diseases， intraoperative blood loss and operative time between the two groups. The postoperative shoulder function score of the experimental group was higher than that of the normal group. ConclusionsThe application of modified intraoperative axillary fluoroscopy is recommendable for accurately reducing posterior translation of the distal clavicle， and meanwhile helpful for the precise placement of the clavicular plate.

Young-laplace euuation in convenient polar coordinates and its implementation in matlab® / Ecuació de youngg-laplace en coordenadas polares convenientes y su implementación en matlab® / Equação de oung--laplace em coordenadas polares adequadas e sua programação em attlab®

A new form of expression for the Young-Laplace equation is proposed. The Young-Laplace equation is developed in a convenient polar coordinate system and programmed in MatLab®. The profile generated showed to be in agreement with those reported in literature. An algorithm that avoids profile interpolation was developed and tested for the measurement of surface tension from profiles of pendant drops.

Se propone una nueva forma para expresar la ecuación de Young-Laplace. Se desarrolló laecuaciónde Young-Laplaceen un sistema de coordenadas tipo polar conveniente, y su solución se programó en el software MatLab®. Los perfiles que se generaron mostraron una excelente coincidencia con los reportados en la literatura. Se desarrolló un algoritmo que evita la interpolación en los perfiles, el cual se evaluó para la determinación de la tensión superficial a partir de perfiles de gotas pendientes.

Propõe-se uma nova forma para expressar a equação de Young-Laplace. Desenvolveu-se a equação de Young-Laplace em um sistema de coordenadas tipo polar adequado e sua solução programou-se no software MatLab®. Os perfis gerados mostraram uma excelente coincidência com os reportados na literatura. Desenvolveu-se um algoritmo que evita a interpolação nos perfis, o qual foi avaliado para a determinação da tensão superficial a partir de perfis de gotas pingentes.