It may occur early in the disease and is one of the five indicators of a worse prognosis, which are:
- Gage sign
- calcification lateral to the epiphysis
- lateral subluxation of the femoral head
- horizontal growth plate
- metaphyseal cyst
History and etymology
The sign was described by H. Courtney Gage, (1886-1947) a British radiologist, in an article in 1933 3; he was Director of Radiology at St Mary's Hospital in London 4.
- 1. Wenger DR, Ward WT, Herring JA. Legg-Calvé-Perthes disease. J Bone Joint Surg Am. 1991;73 (5): 778-88. Pubmed citation
- 2. essentials of skeletal radiology. Lippincott Williams & Wilkins. (2004) .
- 3. Gage HC (1933) A possible early sign of Perthes’ disease. Br. J. Radiol. 1933;6:295-297. https://doi.org/10.1259/0007-1285-6-65-295
- 4. Williams R. Dr. H. Courtney Gage. BJR 1947;20:239, 441-442 https://doi.org/10.1259/0007-1285-20-239-441.