Pleomorphic sarcoma secondary to proximal femoral epiphysiolysis with bone infarction over 4 years after cementless total hip replacement in a dog

In similar cases, submitting the femoral head for histopathologic examination should be considered at the time of the hip replacement surgery. If bone infarction is diagnosed as a causative agent, given the possibility of malignant transformation, long-term serial radiographic monitoring should be given serious consideration.