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The triangular fibrocartilage disc (TFC) is an articular discus that lies on the pole of the distal ulna.It has a triangular shape and a biconcave body; the periphery is thicker than its center.
Micrograph showing a fragment of an intervertebral disc demonstrating degenerative fibrocartilage with loss of nuclei and nests of chondrocytes, as seen in degenerative disc disease. HPS stain. Degeneration of fibrocartilage is seen in degenerative disc disease.
The articular disc (or disk) is a thin, oval plate of fibrocartilage present in several joints which separates synovial cavities. This separation of the cavity space allows for separate movements to occur in each space.
Instead, it is connected to and articulates with the ulna through the Triangular fibrocartilage disc [1] and ligament, which forms part of the ulnocarpal joint capsule. [2] It connects with the pisiform, hamate, and lunate bones. It is the 2nd most commonly fractured carpal bone.
An intervertebral disc (British English), also spelled intervertebral disk (American English), lies between adjacent vertebrae in the vertebral column.Each disc forms a fibrocartilaginous joint (a symphysis), to allow slight movement of the vertebrae, to act as a ligament to hold the vertebrae together, and to function as a shock absorber for the spine.
The joint features a triangular articular disc that is attached to the inferior margin of the ulnar notch by its base, and to a fossa at the base of the styloid process of the ulna by its apex. [3] The articular disc acts to firmly bind the distal extremities of the two bones together.
Triangular fibrocartilage complex (TFCC) injury occurs in 39% to 82% of cases. Ulnar styloid process fracture increases the risk of TFCC injury by a factor of 5:1. However, it is unclear whether intercarpal ligaments and triangular fibrocartilage injuries are associated with long term pain and disability for those who are affected. [5]
The number of vertebrae in a region can vary but overall the number remains the same. In a human spinal column, there are normally 33 vertebrae. [3] The upper 24 pre-sacral vertebrae are articulating and separated from each other by intervertebral discs, and the lower nine are fused in adults, five in the sacrum and four in the coccyx, or tailbone.