Scallop sign
Citation, DOI, disclosures and article data
Citation:
Sharma R, Yap J, Weerakkody Y, et al. Scallop sign. Reference article, Radiopaedia.org (Accessed on 09 Mar 2025) https://doi.org/10.53347/rID-76549
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rID:
76549
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Disclosures:
At the time the article was created Rohit Sharma had no recorded disclosures.
View Rohit Sharma's current disclosures
Last revised:
Disclosures:
At the time the article was last revised Joshua Yap had no financial relationships to ineligible companies to disclose.
View Joshua Yap's current disclosures
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5 times, by
4 contributors -
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Synonyms:
- Scallop sign - wrist
The scallop sign is a radiological sign initially described in rheumatoid arthritis of the wrist.
It refers to the appearance of the ulnar aspect of the distal radius on a plain radiograph of the wrist, where it has a scalloped shape with a sclerotic border 1,2. It occurs due to progressive erosive changes at the distal radioulnar joint 1,2. While initially described in rheumatoid arthritis, it has also been described in osteoarthritis of the wrist 2.
The scallop sign, swelling in the extensor compartment of the hand, and severe dorsal subluxation are predictive of rupture of the extensor tendons of the hand, including Vaughan-Jackson syndrome 1,3.
History and etymology
The sign was first described by R A Freiberg and A Weinstein in 1972 1.
Quiz questions
References
- 1. Freiberg RA, Weinstein A. The scallop sign and spontaneous rupture of finger extensor tendons in rheumatoid arthritics. (1972) Clinical orthopaedics and related research. 83: 128-30. doi:10.1097/00003086-197203000-00024 - Pubmed
- 2. Chul-Hyun Cho, Si-Wuk Lee. Extensor tendon rupture caused by instability of the ulnar head with an osteoarthritic distal radioulnar joint: a case report. (2013) Journal of Medical Case Reports. 7 (1): 1. doi:10.1186/1752-1947-7-281 - Pubmed
- 3. Asano K et.al. Risk factors for rupture of extensor tendons in the rheumatoid wrist. (2020) The Journal of hand surgery, European volume. doi:10.1177/1753193420928481 - Pubmed
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