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Functional aspects of the coracoclavicular space
Masataka Nakazawa1, Masahiro Koizumi, Akimoto Nimura
1Unit of Clinical Anatomy, Graduate School, Tokyo Medical and Dental University, 1-5-45 Yushima, Bunkyo-ku, Tokyo, 113-8519, Japan.
Surgical and Radiologic Anatomy : SRA
|November 15, 2011
Summary
The coracoclavicular joint, a space between the coracoid process and clavicle, plays a crucial role in shoulder function. This study details its structure and impact on scapular motion.
Area of Science:
- Anatomy
- Biomechanics
- Orthopedics
Background:
- The coracoclavicular joint is an inconsistently described articulation between the coracoid process and clavicle.
- A small space, bordered by fascia covering the subclavius muscle and coracoclavicular ligament, is often observed.
- Previous literature has not fully detailed this space or its functional significance.
Purpose of the Study:
- To meticulously examine the coracoclavicular joint space.
- To elucidate the functional role of the coracoclavicular joint in shoulder biomechanics.
- To enhance understanding of shoulder anatomy and articulation.
Main Methods:
- Utilized sixteen Japanese cadaveric shoulder girdles.
- Dissected scapula, clavicle, first rib, subclavius muscle, and surrounding fascia en bloc.
- Performed macroscopic investigation of ligamentous and muscular attachments and fascial extensions, alongside motion observation.
Main Results:
- Observed a distinct space formed by fascial sheets, coracoclavicular ligaments, coracoid process, and clavicle.
- Identified the fascia dividing into anterior (trapezoid ligament) and posterior (conoid ligament) sheets.
- Demonstrated that clavicular collision with the trapezoid ligament within this space restricts scapular motion.
Conclusions:
- The coracoclavicular joint is more consistently identifiable than previously reported.
- This joint significantly contributes to the normal biomechanical function of the shoulder.
- Further research into the coracoclavicular joint's role in shoulder pathologies is warranted.
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