Abstract
BackgroundAcromial fractures are rare and there is no consensus on fixation, but an increasing number of studies have reported using two screws to fix Ogawa type I acromial fractures. The objective of this study was to obtain the ideal length, diameter, insertion point, and angle of the screw using a novel 3D simulation.MethodsThe scapular CT data of 100 individuals were obtained to reconstruct 3D models. The transparency of the 3D model was then downgraded along the axial perspective (the view perpendicular to the cross section of the acromion axis) to find the maximum translucent area. Two virtual screws were placed at the anterior edge of the acromion until they penetrated the posterior cortical bon. The largest diameters and lengths of the screw were measured, and the direction and insertion point of the screw were observed.ResultsThe mean maximum lengths of the medial and lateral screws were 43.33 ± 6.17 mm and 39.23 ± 6.01 mm, respectively. The mean maximum diameters of the medial and lateral screws were 4.71 ± 1.23 mm and 4.97 ± 1.07 mm, respectively. Differences in screw length, diameter, and insertion point between males and females were found. The differences in screw angle between sexes were not statistically significant.ConclusionsBased on a 3D model test, we recommend the size, entry points, and angles of screws for Ogawa type I acromial fractures, providing valuable guidance for clinical work. More accurate screw parameters can be obtained preoperatively by establishing an individualized 3D model.
Highlights
Acromial fractures are rare injuries, accounting for approximately 8–16% of scapular fractures [1, 2]
In 1997, Ogawa proposed a practical classification based on the location of the acromial fracture line and anatomical structure [3]
Materials and methods One hundred Chinese individuals without fractures or lesions of the right scapula were enrolled between January 2019 and November 2020 in this study
Summary
Acromial fractures are rare injuries, accounting for approximately 8–16% of scapular fractures [1, 2]. In 1997, Ogawa proposed a practical classification based on the location of the acromial fracture line and anatomical structure [3]. He classified acromial fractures as follows: type I fractures consist of those of the anatomic acromion and extremely lateral scapular spine. Type II fractures consist of those located in the more medial spine and descending to the spinoglenoid notch This classification is recognized and used to guide treatment. Acromial fractures are rare and there is no consensus on fixation, but an increasing number of studies have reported using two screws to fix Ogawa type I acromial fractures. The objective of this study was to obtain the ideal length, diameter, insertion point, and angle of the screw using a novel 3D simulation
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