![]() The most common site of sternal fractures is at the sternal angle. A fracture of the sternum is usually a comminuted fracture, meaning it is broken into pieces. However, they may result from trauma, such as when a driver's chest is forced into the steering column of a car in a car accident. The sternum articulates on either side with the clavicle and upper seven costal cartilages.įractures of the sternum are rather uncommon. The sternum is composed of highly vascular cancellous tissue, covered by a thin layer of compact bone which is thickest in the manubrium between the articular facets for the clavicles. Its average length in the adult is about 17 cm, and is rather longer in the male than in the female. It is slightly convex in front and concave behind broad above, becoming narrowed at the point where the manubrium joins the body, after which it again widens a little to below the middle of the body, and then narrows to its lower extremity. In its natural position, the inclination of the bone is oblique from above, downward and forward. In early life, the body of sternum consists of four segments or sternebrœ. It consists of three parts, from above downward: Its top is also connected to the Sternocleidomastoid muscle. The sacrum is a flat bone, and the amount of bone is relatively scant in the sacral. ![]() The patient is placed in the prone position, and the screw is inclined 2530° cephalad and aimed toward the sacral promontory and enters the subchondral bone. Its upper end supports the clavicles (Collar bones), and its margins articulate with the cartilages of the first seven pairs of ribs. Method 2: The entry angle is 35° lateral to the sacral ala. The sternum is an elongated, flattened bone, forming the middle portion of the anterior wall of the thorax. ![]()
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