1, navicular
The scaphoid is close to the radial side of the platoon and shaped like a boat, hence the name. But irregular, the back is long and narrow, rough and uneven, and forms a joint with the radius. Fall injury, palm landing, scaphoid bearing the brunt, compressed between the radius and skull, forming a fracture. The position of scaphoid has large shear force, poor blood supply and difficult healing.
2, lunate bone
The lunate bone is half-moon-shaped, located between the scaphoid and the triangular bone. Its upper surface is connected with the articular disc, its lower surface is connected with hamate and skull, its inner side is connected with the triangular bone, and its outer side is connected with the scaphoid.
3. Triangular bone
Triangular bone is tapered, with the base facing outwards and the tip facing downwards. The upper part is related to the articular disc, the lower part is connected with hamate, and the volar part is connected with pisiform bone.
Extended data
Physiological significance of triangular bone: the upper lateral side is related to distal radioulnar joint's disc; The medial side is rough, with ligaments attached, the lower side is skinny, hinged with hamate, and the anterior side has an oval articular surface, hinged with pisiform bone; It is one of the abnormal variations of foot bone, which occurs in the posterior process of talus and is formed by the matrix of independent epiphyseal hyaline cartilage. Its occurrence rate is 8% ~ 10%, generally symmetrical on both sides, which is very similar in X-ray photos.
Triangular bone is located at the posterior lower edge of talus, and there is a narrow crack between it and talus. This kind of bone is generally triangular, but sometimes it is round and quadrilateral, the size of a pea, and in a few cases it is larger. This is one of the redundant bones.
Baidu encyclopedia-triangle bone
Baidu Encyclopedia-Moon Valley
Baidu encyclopedia-navicular bone