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
- 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) .