Which ligaments limit the relative mobility of the clavicle at thesternal end? At the acromial end?
Which ligaments limit the relative mobility of the clavicle at the
sternal end? At the acromial end?
The ligament is a type of connective tissue. It is strong and elastic in nature. Ligaments are known to connect bone to bone. These types of ligaments are known as true ligaments. There are various types of ligaments present in the body. These include:
- The peritoneal ligaments are the folds of the peritoneum. This is responsible for connecting the viscera to the abdominal wall or viscera to the viscera.
- The periodontal ligament as the name suggests, are fibers that connect the cementum of the teeth with the associated alveolar bone.
The ligament is similar to tendons and fasciae. They are all connective tissues. But they differ in their functions. The ligaments are responsible for connecting bone to bone, the tendons are responsible for connecting muscles to bones, and the fasciae are responsible for connecting muscle to muscle. Ligaments are generally not regenerated if they undergo wear and tear, except periodontal ligaments. Periodontal ligament stem cells can generate periodontist ligaments and are present near the same. Ligaments are present around all joints, such as the knee, elbow, and all other joints around the skeletal system.
The sternoclavicular (SC) joint is the joint between the sternum and the clavicle. It is classified as a synovial joint. This joint is the only joint that connects the upper limbs with the axial skeleton. This joint is formed by the articulation of the medial aspect of the clavicle and the manubrium of the sternum and is the least constricted joint of the skeletal system. The sternoclavicular joint is strongly articulated by ligaments, thus in cases of injury, the clavicle tends to break before the dislocation of the joint itself. Mainly four ligaments are associated with the SC joint. These are described as follows:
- Anterior sternoclavicular ligament: It is composed of a broad band of fibers. It covers the anterior surface of the clavicle and runs in a downward and medial direction towards the sternum. It is responsible for reinforcing the joint anteriorly, limiting the anterior translation of the clavicle, and keeping a check on the anterior movement of the head of the clavicle.
- Posterior sternoclavicular ligament: It is composed of a broad band of fibers. It covers the posterior surface of the clavicle. It is responsible for reinforcing the joint posteriorly, limiting the posterior translation of the clavicle, and keeping a check on the posterior movement of the head of the clavicle.
- Costoclavicular ligament: It acts as the permanent restraint of the SC joint because of its orientation. It is responsible for anchoring the inferior surface of the sternal end of the clavicle to the 1st rib & its costal cartilage. It is involved in limiting the elevation of the pectoral girdle. It also acts as a fulcrum for protraction-retraction and elevation-depression. It is also involved in checking the superior glide and clavicular elevation of the clavicle.
- Interclavicular ligament: It is responsible for connecting the sternal ends of each clavicle with the ligaments of the capsule and the upper manubrium. It is also responsible for producing a bilateral depression force.
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