What Is the Hamate Bone?
It is half-moon-shaped, located between the scaphoid bone and the triangular bone, the upper part is connected with the articular disc, the lower part is connected with the hook bone and the skull bone, the inner side is connected with the triangular bone, and the outer side is connected with the hand bone.
- Chinese name
- Lunar bone
- Cause
- Increased bone density
- development of
- Irregular fragmentation
- Post period
- Increased joint space, sparse bone adjacent to bones
- It is half-moon-shaped, located between the scaphoid bone and the triangular bone, the upper part is connected with the articular disc, the lower part is connected with the hook bone and the skull bone, the inner side is connected with the triangular bone, and the outer side is connected with the hand bone.
Physiological significance of lunar bone
- It is divided into two parts, the inner and outer parts, which are related to the skull and hook. Normally, when the dorsiflexion of the wrist and the flexion of the palm, the lunar bone rotates to a certain extent on the articular surface of the lower end of the radius and on the skull. During the fall, the wrist was extremely extended, the lunar bone was squeezed between the lower end of the radius and the cephalic bone, the joint capsule was ruptured, and the lunar bone was dislocated to the palm. °. When the palmar ligament is intact, the blood supply to the lunar bone can still be supplied by the blood vessels in the ligament. If it can be restored early, the lunar bone can survive, and the wrist joint can maintain good function; if the dislocation is not complete, the volar and dorsal ligaments of the radial wrist are broken, the blood supply of the lunar bone is lost, and ischemic necrosis can occur.
Anatomy of the lunar carpal bone
- A total of 8 blocks, arranged in two columns, 4 blocks each. The proximal column is from the thumb side to scaphoid bone, lunate bone, traquetral bone, and pisiform bone. From the thumb side, the distal column is composed of trapezium bone, trapezoid bone, capitate bone and hamate bone.
- The eight carpal bones are not arranged on a plane, and the medial and lateral edges protrude forward, forming a carpal groove.
- When a person falls to the ground with the palm of an outreach stand, the scaphoid fracture can occur because the scaphoid directly faces the radius.