 | Routine radiographs reveal a large septated osteolytic lesion in the supraacetabular area of one hip. The femoral head appears normal. |
 | CT scan reveals that the cortex is thinned and destroyed medially, which is suggestive of an aggressive lesion rather than simply a huge subchondral degenerative cyst. |
 | Total body bone scan reveals increased uptake of isotope only in the supraacetabular region. |
 | Open biopsy demonstrates cartilage without much pleomorphism, although an occasional double nucleus is seen. The history, radiographic studies, and histosections suggest a low grade chondrosarcoma, classified as IA. |
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 | A wide resection was performed, and this split specimen reveals the chondrosarcoma filling the supraacetabular area. The neoplasm had spread minimally into the surrounding bony tissue. |
| Reconstruction was with a large allograft fixed with plates and screws, plus a total hip joint. However, his wound became infected postoperatively, requiring aggressive debridement. All of the hardware and the large allograft were removed. All signs of the infection subsided, and his operative wounds became dry. There were no recurrences or metastases. |
 | He was reoperated on, and the defect replaced with this saddle type total hip. These radiographs were made 3.5 years post revision to the saddle prosthesis. It is approximately 15 years after his initial chondrosarcoma surgery and he remains free of tumor. He is reasonably comfortable, swims regularly, and ambulates with a cane or crutch. |
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