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Measurement of Dynamic Scapular Kinematics Using an Acromion Marker Cluster to Minimize Skin Movement Artifact
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Intra-protocol repeatability and inter-protocol agreement for the analysis of scapulo-humeral coordination.
I Parel1, A G Cutti, A Kraszewski
1I.N.A.I.L. Centro Protesi, Vigorso di Budrio, Bo, Italy, ilariaparel@gmail.com.
Medical & Biological Engineering & Computing
|October 19, 2013
Summary
This study assessed shoulder kinematics protocols, finding similar repeatability for scapula tracker (ST) and INAIL Shoulder and Elbow Outpatient protocol (ISEO) methods. Between-protocol agreement was demonstrated for specific scapular rotations, aiding multi-center trial data compatibility.
Area of Science:
- Biomechanics
- Orthopedics
- Clinical Measurement
Background:
- Multi-center clinical trials using shoulder kinematics are infrequent.
- Lack of repeatability and limits of agreement (LoA) studies hinders dataset compatibility across different centers and motion analysis protocols.
- Standardizing shoulder kinematic measurement is crucial for reliable multi-center studies.
Purpose of the Study:
- To determine the repeatability and LoA between two distinct shoulder kinematic protocols.
- To compare a scapula tracker (ST) protocol with the INAIL Shoulder and Elbow Outpatient protocol (ISEO).
- To assess the compatibility of shoulder kinematic data collected across different centers.
Main Methods:
- Two protocols were evaluated: ST using an optoelectronic system and ISEO using an inertial and magnetic system.
- Within-protocol repeatability was assessed on 23 healthy subjects.
- Between-protocol agreement was evaluated for scapular rotations and humeral elevation ranges.
Main Results:
- Within-protocol repeatability was similar for both ST (SEM=2.5°) and ISEO (SEM=2.3°) protocols, comparable to existing literature.
- Between-protocol agreement was found for scapula medio-lateral rotation up to 120° flexion-extension and 100° abduction.
- Scapula protraction-retraction agreement was observed over a narrower range of humeral elevation.
Conclusions:
- The ST and ISEO protocols exhibit comparable within-protocol repeatability.
- Agreement between the two protocols exists for specific scapular rotations, supporting their use in multi-center studies.
- Adaptable thresholds for repeatability and LoA may be necessary depending on clinical hypotheses.
