Crescent sign
Crescent sign
The Crescent sign (pronunciation: /ˈkrɛs(ə)nt sʌɪn/) is a radiological sign often seen in avascular necrosis of the hip. It is named for its characteristic appearance, which resembles a crescent moon.
Etymology
The term "crescent" comes from the Latin crescere, meaning "to grow", and the term "sign" from the Latin signum, meaning "mark" or "token". The name is descriptive of the shape of the radiological finding.
Description
The Crescent sign is a subchondral radiolucent line seen on plain radiographs of the hip. It is one of the earliest signs of avascular necrosis, a condition where the bone tissue dies due to lack of blood supply. The sign is indicative of a subchondral fracture, which is a break in the bone just below the cartilage.
Related Terms
- Avascular necrosis: A condition where the bone tissue dies due to lack of blood supply.
- Subchondral: Referring to the area of bone just beneath the cartilage.
- Radiolucent: Referring to a substance or tissue that allows the passage of X-rays or other forms of radiation.
- Radiograph: An image produced on a sensitive plate or film by X-rays, gamma rays, or similar radiation, and typically used in medical examination.
See Also
- Ficat stage: A classification system used to describe the severity of avascular necrosis.
- Osteonecrosis: Another term for avascular necrosis.
External links
- Medical encyclopedia article on Crescent sign
- Wikipedia's article - Crescent sign
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