Presentation
Left knee swelling for 2 months. Severe pain after slipping.
Patient Data
There is complete fracture at the distal (metadiaphysis) femur with overriding and posteromedial displacement of the distal fracture segment. Small laterally displaced osseous fragment is also observed. The fracture margins are irregular. There are ill-defined lucencies reflective of lytic changes involving the distal shaft, metaphysis and epiphysis of the femur. Interrupted periosteal reaction (Codman triangle) is demonstrated at the distal femoral shaft above the fracture site. Lobulated soft tissue mass density is seen surrounding the fracture and effacing the adjacent fat planes.
Red arrow highlights the Codman triangle.
Case Discussion
This is a case of pathological fracture in a diagnosed case of osteosarcoma.