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Designing for Upper Torso and Arm Anatomy
Published in Karen L. LaBat, Karen S. Ryan, Human Body, 2019
The clavicles (collarbones) form part of the structure of the horizontal “clothes hangar” of the shoulder discussed in Chapter 1. “Collar” bone presumably refers to an apparel collar around the neck which extends to and covers a portion of the bone. The sternoclavicular joint—the articulation point for the clavicle and the manubrium of the sternum—is the only bony link between the axial and upper appendicular skeletal structures. It is a relatively complex synovial joint, with both ball-and-socket features and some hinge elements. The clavicle’s relationships to the rib cage and arm are shown in Figure 4.17. It is supported by a ligament bridging the space between the R and L clavicles as well as by ligaments attaching the clavicle to the sternum and the first rib (Hollinshead & Jenkins, 1981, p. 79). The sternoclavicular joint allows moderate motion of the pectoral girdle in the transverse and coronal planes, but less movement in a sagittal plane. Because it can move in all three planes the clavicle can circumduct in the sternoclavicular joint, making “shoulder rolls” possible. This joint, somewhat surprisingly, tends to function well without many problems—testimony to the strength and versatility of the muscles and ligaments in the shoulder region.
Functional Anatomy and Biomechanics
Published in Emeric Arus, Biomechanics of Human Motion, 2017
The clavicle articulates with the manubrium of the sternum and also with the first rib. The clavicle acting as a mechanical arm, maintains the glenohumeral joint at its correct distance from the sternum. The clavicle is a prolonged S-shaped bone. The sternum and clavicle are united by the sternoclavicular joint (Figure 3.2).
Management of clavicle shaft fractures with intramedullary devices: a narrative review
Published in Expert Review of Medical Devices, 2020
Paul Reginald King, Robert Patrick Lamberts
The clavicle is the first bone in the body to ossify (5th week of fetal life) and the only long bone to ossify by intramembranous ossification without going through the cartilaginous stage [12]. The medial growth plate of the clavicle is the last growth plate in the body to close, usually between 22 and 25 years of age [12]. The clavicle articulates medially with the sternum at the sternoclavicular joint and laterally with the acromion at the acromioclavicular joint.