Which carpal is on the lateral side of the wrist?

Which carpal is on the lateral side of the wrist?

The trapezium is the most lateral of the distal row of carpal bones and articulates with four bones – the first and second metacarpals distally, the scaphoid proximally, and the trapezoid medially.

What is the lateral wrist bone called?

Carpal bones
Carpal bones in the wrist Your wrist is made up of eight small bones called the carpal bones, or the carpus. These join your hand to the two long bones in your forearm — the radius and ulna.

What constitutes a true lateral wrist?

The academic rule of a true lateral wrist radiograph is defined by the pisoscaphocapitate relationship, where the palmar cortex of the pisiform should lie centrally between the anterior surface of the distal pole of the scaphoid and the capitate, ideally in the central third of this interval 1.

What is the anatomy of wrist joint?

The wrist is a complex joint that bridges the hand to the forearm. It is actually a collection of multiple bones and joints. The bones comprising the wrist include the distal ends of the radius and ulna, 8 carpal bones, and the proximal portions of the 5 metacarpal bones (see the images below).

What is the second proximal carpal bone from the lateral side?

The next two proximal carpal bones, namely the lunate bone and the triquetral bone articulate with the head of the radius, which is known as the carpal articular surface.

Which two carpal bones are the most lateral bones of the wrist?

Figure 2: The carpal bones form the wrist and transition from wrist to hand. Scaphoid — The scaphoid bone is the largest and most lateral (thumb side) of the carpal bones in the proximal row. It articulates with the radius proximally and the trapezium and trapezoid bones in the distal row of carpal bones.

What ligament forms carpal tunnel?

The carpal tunnel is an osteofibrous canal located in the volar wrist. The boundaries are the carpal bones forming the floor, and the flexor retinaculum (or transverse carpal ligament) forming the roof (Fig. 1A).

What are the wrist ligaments?

Wrist Ligaments The Ulnocarpal and radioulnar ligaments are two sets of ligaments that provide the main support for the wrist. The scapholunate interosseous ligament and the lunotriquetral interosseous ligament provide stability to the proximal carpal row.

Where is the lateral forearm?

The radius runs parallel to the ulna, on the lateral (thumb) side of the forearm (see Figure 2).

What is the proper position of the wrist for the lateral projection?

For a lateral rotation oblique, from a prone position, rotate the wrist laterally approximately 45 degrees. For a medial oblique, medially rotate the wrist 45 degrees. Use a translucent support if appropriate. When the scaphoid is to be examined, ulnar deviate the wrist.

Is the accessory carpal bone medial or lateral?

The accessory carpal bone forms the lateral border of the carpal canal. From lateral to medial, the ulnar carpal, the intermediate carpal, and the radial carpal bones complete the proximal row. The middle carpal joint lies between the proximal and distal rows of carpal bones.