What is the distal part of the ulna?

What is the distal part of the ulna?

The lateral, distal end of the ulna is the head of the ulna. It articulates with the ulnar notch on the radius and with the triangular articular disc in the Wrist Joint.

What is the distal end of the ulna called?

The ulna begins at birth as a long bony shaft, known as the diaphysis, capped with hyaline cartilage at both ends. At around 4 years of age, the hyaline at the distal end by the wrist begins to ossify and forms a small bony cap known as the distal epiphysis.

Which process is found in ulna?

olecranon process
Close to the elbow, the ulna has a bony process, the olecranon process, a hook-like structure that fits into the olecranon fossa of the humerus. This prevents hyperextension and forms a hinge joint with the trochlea of the humerus.

What is the distal end of the bone?

The radius is the larger of the two bones of the forearm. The end toward the wrist is called the distal end. A fracture of the distal radius occurs when the area of the radius near the wrist breaks. Distal radius fractures are very common.

What causes a distal ulna fracture?

The most common cause of ulnar styloid fracture, or any other wrist fracture, is falling onto an outstretched arm.

What is a distal radius and ulna fracture?

A distal radius fracture can be isolated, which means no other fractures are involved. It can also occur along with a fracture of the distal ulna (the forearm bone on the small finger side). In these cases, the injury is called a distal radius and ulna fracture.

Which of the following is the most distal part of the ulna?

Figure 6.44. Ulna and Radius The ulna is located on the medial side of the forearm, and the radius is on the lateral side. These bones are attached to each other by an interosseous membrane. More distal is the shaft of the ulna.

Is the ulna proximal or distal?

The ulna (Figure 7.19) is the longer of the two bones in the forearm, or antebrachium. It has a prominent proximal portion, but its shaft tapers distally. Proximally the ulna articulates with the humerus and the radius. Distally it contacts the carpus or wrist.

What is the coronoid process of ulna?

The coronoid process is a triangular eminence projecting forward from the upper and front part of the ulna. Its base is continuous with the body of the bone, and of considerable strength. Its apex is pointed, slightly curved upward, and in flexion of the forearm is received into the coronoid fossa of the humerus.

What is the distal end?

Distal: The more (or most) distant of two (or more) things. For example, the distal end of the femur (the thigh bone) is the end down by the knee; the end more distant from the torso. The opposite of distal is proximal.

How is a distal ulna fracture treated?

Consideration of the treatment of distal ulna metaphyseal fracture should be addressed after treating a distal radius fracture. If it is stable, cast immobilization is preferred, however, if it shows malalignment or instability, an operative method should be considered.

What kind of fracture is the distal ulna?

Combined distal radius and distal ulna fractures Most distal ulna fractures occur with a distal radius fracture. On the whole the clinical outcome following such an injury will be determined by the type and severity of the distal radius fracture.

Which is the distal end of the ulnar notch?

The alignment of the ulnar head and the ulnar notch allows the distal end of the ulna work as a pivot so the radius can rotate around it in all directions [8]. The styloid process is a small bony protrusion extending from the posterior medial side of the head [7]. This is where the ulnar collateral ligament (UCL) of the wrist attaches [8].

Where is the styloid process located in the ulna?

Distal ulna The distal head of the ulna is comprised of the articular circumference which articulates with the wrist bones and posteriorly, a bony projection known as the styloid process. Just above it on the medial aspect of the bone, the attachment of the pronator quadratus which runs between the radius and the ulna is positioned.

How does the ulna act as a stabilising bone?

The ulna acts as the stabilising bone, with the radius pivoting to produce movement. Proximally, the ulna articulates with the humerus at the elbow joint. Distally, the ulna articulates with the radius, forming the distal radio-ulnar joint. In this article, we shall look at the bony landmarks and osteology of the ulna.