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Updated: Aug 30, 2025
10:07
Measurement of Dynamic Scapular Kinematics Using an Acromion Marker Cluster to Minimize Skin Movement Artifact
Published on: February 10, 2015
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Acromioclavicular and coracoclavicular ligamentous insertion distances depend on the scapular tilt and decrease with
Julia Sußiek1, Jens Wermers1, Michael J Raschke1
1Department of Trauma-, Hand- and Reconstructive Surgery, University Hospital Münster, Waldeyerstr. 1, 48149, Münster, Germany.
Summary
Scapular deflection significantly impacts acromioclavicular and coracoclavicular distances. Anterior scapular positioning, achieved with dorsal support, reduces these distances, aiding reliable acromioclavicular joint reduction.
Area of Science:
- Orthopedic surgery
- Biomechanics
- Anatomy
Background:
- High complication rates persist in acromioclavicular and coracoclavicular ligamentous complex reconstructions.
- Intraoperative distances between clavicle, acromion, and coracoid are critical for successful refixation.
Purpose of the Study:
- To analyze the influence of scapular deflection on coracoclavicular and acromioclavicular distances.
- To assess how patient positioning affects ligamentous insertion distances.
Main Methods:
- 24 fresh-frozen human scapulae were used, with ligamentous insertions exposed.
- A 3D measurement arm system captured ligamentous insertions.
- Scapular inferior angle deflection (anterior/posterior) simulated patient positioning with/without dorsal support.
Main Results:
- Posterior scapular deflection nearly doubled conoid ligament distance (195.3% vs. 100.0%, p=0.028).
- Acromioclavicular capsule insertion distance increased significantly with posterior deflection (116.1% vs. 100.0%, p=0.008).
Conclusions:
- Dorsal scapular support, by shifting the inferior angle anteriorly, reduces critical ligamentous insertion distances.
- Patient positioning with posterior scapular support is recommended for reliable acromioclavicular joint reduction.
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