Round # 17

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• What is the Differential Diagnosis?
• What is the Correct Diagnosis?

Radiographic Findings

A radiograph of the pelvis (film 2) demonstrates marked wear of the acetabular liner, with superolateral displacement of the femoral head (red arrow). There is a large radiolucent area superior to the left acetabular component (yellow arrow), and bony resorption of the proximal medial femur adjacent to the insertion site of the femoral prosthetic component (green arrow). These changes are not seen on his previous film (film 1).

Film 1

Film 2

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