[Subtrochanteric renal cell carcinoma metastasis: implantation of a femoral head preserving prosthesis]. / Subtrochantäre Nierenzellkarzinommetastase: Hüftkopferhaltender Femurteilersatz.

A 60-year-old man presented to our institution with a singular subtrochanteric renal cell carcinoma metastasis of the right femur. Tumor resection and implantation of a cemented femoral head preserving prosthesis was considered as the best treatment option to obtain a good hip joint function. After successful surgery (R0 resection) the patient was immediately mobilized with full weight-bearing. One year postoperatively the patient presented with good joint function and absolute mobility. X-ray examinations revealed a good position of the implanted prosthesis without signs of tumor recurrence or femoral head necrosis. Implantation of a femoral head preserving prosthesis is a good option for the treatment of subtrochanteric/diaphyseal tumors of the femur.

[Osteoid osteoma. X-ray-controlled resection and histologic verification using a minimally invasive diamond bone-cutting system]. / Osteoidosteom. Minimal-invasive, bildwandlergesteuerte Resektion und histopathologische Diagnosesicherung mittels Diamanthohlfräsen.

BACKGROUND: In recent years, osteoid osteomas have been treated more frequently by means of percutaneous procedures. The main disadvantage in patients with suspected osteoid osteoma is the lack of histological verification. Our study presents the results that we obtained using a minimally invasive diamond bone-cutting system allowing histologic verification. MATERIALS AND METHODS: Six patients (age 10-20 years) with osteoid osteoma in the lower extremities were subjected to resection of the nidus using a minimally invasive water-cooled diamond bone-cutting system. All specimens were histologically processed and diagnosed. RESULTS: In all patients the nidus was resected successfully, and the diagnosis was histologically confirmed. The mean operating time was 22.8 min. All patients were allowed full weight-bearing immediately, and hospitalization was a maximum of 2 days. All patients were free of pain and relapse-free during the entire 2-year postoperative follow-up. CONCLUSION: In selected localizations with a clearly visible nidus, the minimally invasive diamond bone-cutting system presented here offers an alternative to the established surgical and percutaneous procedures for treating osteoid osteomas. This procedure combines the advantages of a minimally invasive technique with the option of histological verification of the diagnosis and correct nidus ablation.