Presentation
Non-specific knee pain, patella dislocation previously.
Patient Data
Age: 45 years
Gender: Female
From the case:
Double-layered patella
![](https://prod-images-static.radiopaedia.org/images/33428863/a5b7f8a00ab793a9b9f40cbb2619bb_thumb.jpeg)
![This study is a stack](/packs/stack-YQKLCKBI.gif)
![](https://prod-images-static.radiopaedia.org/images/33428972/bd9015e74784a3657c022b6e1a49f9_thumb.jpeg)
![This study is a stack](/packs/stack-YQKLCKBI.gif)
![](https://prod-images-static.radiopaedia.org/images/33429612/dd32734a5a70f4db551bc34b82482b_thumb.jpeg)
![This study is a stack](/packs/stack-YQKLCKBI.gif)
![](https://prod-images-static.radiopaedia.org/images/33430432/3b2faab830ff6385da3eb183992811_thumb.jpeg)
![This study is a stack](/packs/stack-YQKLCKBI.gif)
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Info
![](https://prod-images-static.radiopaedia.org/images/33428863/a5b7f8a00ab793a9b9f40cbb2619bb_big_gallery.jpeg)
Multiple bilateral double-layered patellae which consist of multiple well-corticated smooth fragments in two rows.
Patellofemoral joints are narrowed with osteophytosis.
Case Discussion
Plain CT scan shows a double-layered patellae with secondary degenerative changes. Double-layered patella (DLP) is a rare form of bipartite patella, it is a congenital anomaly which presents as a multiple fragmented patella with smooth, well-corticated borders. Double-layered patella is pathognomonic for multiple epiphyseal dysplasia.