Ambulatory measurement of the scapulohumeral rhythm: Intra- and inter-operator agreement of a protocol based on inertial and magnetic sensors

摘要: To measure the scapulohumeral rhythm (SHR) in outpatient settings, motion analysis protocol named ISEO (INAIL Shoulder and Elbow Outpatient protocol) was developed, based on inertial magnetic sensors. complete sensor-to-segment calibration, requires involvement of an operator for sensor placement positioning patient's arm a predefined posture. Since this can affect measure, study aimed at quantifying intra- inter-operator agreement. Forty subjects were considered, together with two operators, A B. Three measurement sessions completed each subject: by one In session, humerus scapula rotations measured during sagittal scapular plane elevation movements. agreement assessed computing, between sessions, the: (1) similarity patterns through Coefficient Multiple Correlation (CMC(2)), both considering excluding difference initial value (inter-session offset); (2) 95% Smallest Detectable Difference (SDD(95)) range motion. Results CMC(2) showed that is acceptable (median≥0.85, lower-whisker ≥ 0.75) most rotations, independently from movement inter-session offset. The only exception protraction-retraction medio-lateral rotation abduction (inter-operator), which if offset removed. SDD(95) values ranged 4.4° to 8.6° 4.9° 8.5° intra-operator conclusion, presents high agreement, particularly