The double-layered patella (DLP) is a rare intra-articular disorder that in most cases is associated with multiple epiphyseal dysplasia (MED). The DLP usually consists of an anterior and a posterior layer with a cartilaginous interface between the two parts. In this article, we present a case of bilateral DLP of a 17-year-old female adolescent with MED, suffering clinical symptoms on her left knee. Upon clinical examination, a painful “snapping” of the patella at 30–40° flexion of the left knee was evident and two osseous layers could be identified in standard radiographs. Arthroscopic examination revealed a transient cranial displacement of the posterior osteochondral layer at 30–40° knee flexion that replaced beyond 40° knee flexion with a visible jump. Surgical management in this case of DLP comprised open debridement of the soft tissue interface and fusion of the two osseous layers using double-threaded screws leading to an excellent outcome at 12 months follow-up.
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Goebel, S., Steinert, A.F. & Barthel, T. Surgical management of a double-layered patella: a case report. Arch Orthop Trauma Surg 129, 1071 (2009). https://doi.org/10.1007/s00402-008-0701-z
- Double-layered patella
- Surgical management
- Multiple epiphyseal dysplasia