Abstract
Hypothesis: The clavicle serves as a strut between the thorax and scapula, and lack of this function could affect shoulder mobility. We hypothesized that clavicular discontinuity changes shoulder kinematics, particularly affecting scapular motion. Materials and methods: The study used 14 cadaveric shoulders. Cadavers were stabilized in the sitting position. Manual elevation in the sagittal, scapular, and coronal planes was performed in the intact and clavicular discontinuity models. The thorax-scapula distance and 3-dimensional scapular motion during shoulder elevation were recorded using an electromagnetic tracking device. The differences between the 2 experimental models at each position were analyzed. Results: Clavicular discontinuity resulted in a decreased thorax-scapula distance and in reduced external rotation, upward rotation, and posterior tilting of the scapula. The kinematic changes were observed during elevations in all 3 planes but were greatest in the sagittal plane compared with the scapular and coronal planes. Conclusions: The findings of this study revealed that discontinuity of the clavicle affects shoulder kinematics. Because of its anatomic shape and position, the clavicle stabilizes the external, upward, and posterior rotation of the scapula during arm movement. This function of the clavicle may assist glenohumeral joint motion and help prevent subacromial impingement.
| Original language | English |
|---|---|
| Pages (from-to) | 333-339 |
| Number of pages | 7 |
| Journal | Journal of Shoulder and Elbow Surgery |
| Volume | 22 |
| Issue number | 3 |
| DOIs | |
| Publication status | Published - 2013 Mar 1 |
| Externally published | Yes |
Keywords
- Basic science study
- Biomechanics
- Cadaver Model
- Clavicle fracture
- Clavicular function
- Clavicular nonunion
- Electromagnetic tracking device
- Scapular kinematics
- Scapular motion
- Shoulder kinematics
- Shoulder motion
ASJC Scopus subject areas
- Surgery
- Orthopedics and Sports Medicine
Cite this
The function of the clavicle on scapular motion : A cadaveric study. / Matsumura, Noboru; Nakamichi, Noriaki; Ikegami, Hiroyasu; Nagura, Takeo; Imanishi, Nobuaki; Aiso, Sadakazu; Toyama, Yoshiaki.
In: Journal of Shoulder and Elbow Surgery, Vol. 22, No. 3, 01.03.2013, p. 333-339.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - The function of the clavicle on scapular motion
T2 - A cadaveric study
AU - Matsumura, Noboru
AU - Nakamichi, Noriaki
AU - Ikegami, Hiroyasu
AU - Nagura, Takeo
AU - Imanishi, Nobuaki
AU - Aiso, Sadakazu
AU - Toyama, Yoshiaki
PY - 2013/3/1
Y1 - 2013/3/1
N2 - Hypothesis: The clavicle serves as a strut between the thorax and scapula, and lack of this function could affect shoulder mobility. We hypothesized that clavicular discontinuity changes shoulder kinematics, particularly affecting scapular motion. Materials and methods: The study used 14 cadaveric shoulders. Cadavers were stabilized in the sitting position. Manual elevation in the sagittal, scapular, and coronal planes was performed in the intact and clavicular discontinuity models. The thorax-scapula distance and 3-dimensional scapular motion during shoulder elevation were recorded using an electromagnetic tracking device. The differences between the 2 experimental models at each position were analyzed. Results: Clavicular discontinuity resulted in a decreased thorax-scapula distance and in reduced external rotation, upward rotation, and posterior tilting of the scapula. The kinematic changes were observed during elevations in all 3 planes but were greatest in the sagittal plane compared with the scapular and coronal planes. Conclusions: The findings of this study revealed that discontinuity of the clavicle affects shoulder kinematics. Because of its anatomic shape and position, the clavicle stabilizes the external, upward, and posterior rotation of the scapula during arm movement. This function of the clavicle may assist glenohumeral joint motion and help prevent subacromial impingement.
AB - Hypothesis: The clavicle serves as a strut between the thorax and scapula, and lack of this function could affect shoulder mobility. We hypothesized that clavicular discontinuity changes shoulder kinematics, particularly affecting scapular motion. Materials and methods: The study used 14 cadaveric shoulders. Cadavers were stabilized in the sitting position. Manual elevation in the sagittal, scapular, and coronal planes was performed in the intact and clavicular discontinuity models. The thorax-scapula distance and 3-dimensional scapular motion during shoulder elevation were recorded using an electromagnetic tracking device. The differences between the 2 experimental models at each position were analyzed. Results: Clavicular discontinuity resulted in a decreased thorax-scapula distance and in reduced external rotation, upward rotation, and posterior tilting of the scapula. The kinematic changes were observed during elevations in all 3 planes but were greatest in the sagittal plane compared with the scapular and coronal planes. Conclusions: The findings of this study revealed that discontinuity of the clavicle affects shoulder kinematics. Because of its anatomic shape and position, the clavicle stabilizes the external, upward, and posterior rotation of the scapula during arm movement. This function of the clavicle may assist glenohumeral joint motion and help prevent subacromial impingement.
KW - Basic science study
KW - Biomechanics
KW - Cadaver Model
KW - Clavicle fracture
KW - Clavicular function
KW - Clavicular nonunion
KW - Electromagnetic tracking device
KW - Scapular kinematics
KW - Scapular motion
KW - Shoulder kinematics
KW - Shoulder motion
UR - http://www.scopus.com/inward/record.url?scp=84874242161&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84874242161&partnerID=8YFLogxK
U2 - 10.1016/j.jse.2012.02.006
DO - 10.1016/j.jse.2012.02.006
M3 - Article
VL - 22
SP - 333
EP - 339
JO - Journal of Shoulder and Elbow Surgery
JF - Journal of Shoulder and Elbow Surgery
SN - 1058-2746
IS - 3
ER -