title: Three-Dimensional Rotations of the Scapula During Arm Abduction: Evaluation of the Acromion Marker Cluster Method in Comparison With a Model-Based Approach Using Biplanar Radiograph Images.
abstract: Noninvasive methods enabling measurement of shoulder bone positions are paramount in clinical and ergonomics applications. In this study, the acromion marker cluster (AMC) method is assessed in comparison with a model-based approach allowing scapula tracking from low-dose biplanar radiograph images. Six healthy male subjects participated in this study. Data acquisition was performed for 6 arm abduction positions (0°, 45°, 90°, 120°, 150°, 180°). Scapula rotations were calculated using the coordinate systems and angle sequence was defined by the ISB. The comparison analysis was based on root mean square error (RMSE) calculation and nonparametric statistical tests. RMSE remained under 8° for 0° to 90° arm abduction and under 13.5° for 0° to 180° abduction; no significant differences were found between the 2 methods. Compared with previous works, an improved accuracy of the AMC approach at high arm abduction positions was obtained. This could be explained by the different sources of data used as the "gold standard."
authors.affiliation: Laboratoire de Biomécanique et de Mécanique des Chocs, Université de Lyon, Lyon, France.
authors.forename: Sonia
authors.initials: S
authors.lastname: Duprey
authors.forename: Fabien
authors.initials: F
authors.lastname: Billuart
authors.forename: Sungjin
authors.initials: S
authors.lastname: Sah
authors.forename: Xavier
authors.initials: X
authors.lastname: Ohl
authors.forename: Thomas
authors.initials: T
authors.lastname: Robert
authors.forename: Wafa
authors.initials: W
authors.lastname: Skalli
authors.forename: Xuguang
authors.initials: X
authors.lastname: Wang
mesh_terms: D000328:Adult; D001132:Arm / Q000000981:diagnostic imaging / Q000502:physiology*; D001696:Biomechanical Phenomena; D064368:Healthy Volunteers; D006801:Humans; D021621:Imaging, Three-Dimensional; D008297:Male; D011859:Radiography; D016059:Range of Motion, Articular / Q000502:physiology*; D012399:Rotation; D012540:Scapula / Q000000981:diagnostic imaging / Q000502:physiology*