Traumatic separation of osseous segments in a double-layered patella

INTRODUCTION: Double-layered patella is a rare intra-articular disorder associated with multiple epiphyseal dysplasia. PRESENTATION OF CASE: We present a case of a 40-year old man with acute pain in his left knee after a tackle during soccer play. DISCUSSION: Clinical examination and radiographs confirmed the diagnosis of a bilateral double-layered patella with traumatic separation of the osseous segments on the afflicted left side. Surgical management comprised of open arthrotomy and debridement of the bony interface. Stabilization was performed with tension cerclage, supported by a lag screw with excellent outcome at 12 months follow-up. CONCLUSION: It is possible that micromovement in a double-layered patella can dispose to a traumatic coronal segment displacement. Osseous fusion of traumatic patellar segments can be achieved.