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Antero-posterior and lateral x-ray view of the patient's left knee. Please note the cystic lesion in the proximal tibial metaphysis.
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Lower limb x-rays were performed and the radiographic examination revealed a well demarcated cystic structure in her left tibia, 4 cm below the distal tibial component of the knee arthroplasty (Fig. 1).
Periprosthetic pathologic fracture of the left tibia. An osteolytic pattern due to an evolved Hydatid Cyst is visible.
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X-ray studies revealed a pathologic periprosthetic fracture, below the tibial component, resulting from an extension of the previously treated hydatic cyst (Fig. 2).
Lateral x-ray view of the total knee arthroplasty of the left knee. Extensive bone destruction is present in the proximal tibia. Loosening signs of the femoral component are present.
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Both of the total knee arthoplasty components exhibited signs of loosening (Fig. 3), and after extraction of them, a total revision knee arthroplasty was performed (Fig. 4).