A double-layered patella (DLP) is a rare form of bipartite patella.
It is a congenital anomaly which presents with multiple fragmented patellae with smooth, well-corticated borders. A double-layered patella is considered pathognomonic for multiple epiphyseal dysplasia.1
- 1. Sheffield EG. Double-layered patella in multiple epiphyseal dysplasia: a valuable clue in the diagnosis. Journal of pediatric orthopedics. 18 (1): 123-8. Pubmed