title: Intra-protocol repeatability and inter-protocol agreement for the analysis of scapulo-humeral coordination.
abstract: Multi-center clinical trials incorporating shoulder kinematics are currently uncommon. The absence of repeatability and limits of agreement (LoA) studies between different centers employing different motion analysis protocols has led to a lack dataset compatibility. Therefore, the aim of this work was to determine the repeatability and LoA between two shoulder kinematic protocols. The first one uses a scapula tracker (ST), the International Society of Biomechanics anatomical frames and an optoelectronic measurement system, and the second uses a spine tracker, the INAIL Shoulder and Elbow Outpatient protocol (ISEO) and an inertial and magnetic measurement system. First within-protocol repeatability for each approach was assessed on a group of 23 healthy subjects and compared with the literature. Then, the between-protocol agreement was evaluated. The within-protocol repeatability was similar for the ST ([Formula: see text] = 2.35°, [Formula: see text] = 0.97°, SEM = 2.5°) and ISEO ([Formula: see text] = 2.24°, [Formula: see text] = 0.97°, SEM = 2.3°) protocols and comparable with data from published literature. The between-protocol agreement analysis showed comparable scapula medio-lateral rotation measurements for up to 120° of flexion-extension and up to 100° of scapula plane ab-adduction. Scapula protraction-retraction measurements were in agreement for a smaller range of humeral elevation. The results of this study suggest comparable repeatability for the ST and ISEO protocols and between-protocol agreement for two scapula rotations. Different thresholds for repeatability and LoA may be adapted to suit different clinical hypotheses.
authors.affiliation: I.N.A.I.L. Centro Protesi, Vigorso di Budrio, Bo, Italy, ilariaparel@gmail.com.
authors.forename: I
authors.initials: I
authors.lastname: Parel
authors.forename: A G
authors.initials: AG
authors.lastname: Cutti
authors.forename: A
authors.initials: A
authors.lastname: Kraszewski
authors.forename: G
authors.initials: G
authors.lastname: Verni
authors.forename: H
authors.initials: H
authors.lastname: Hillstrom
authors.forename: A
authors.initials: A
authors.lastname: Kontaxis
mesh_terms: D000328:Adult; D001696:Biomechanical Phenomena; D005260:Female; D006801:Humans; D006811:Humerus / Q000502:physiology*; D008297:Male; D016059:Range of Motion, Articular / Q000502:physiology*; D015203:Reproducibility of Results; D012540:Scapula / Q000502:physiology*; D012785:Shoulder Joint / Q000502:physiology