• case series
• hip rotationplasty
• limb salvage
• orthopedic oncology
• surgery

• Case report
• Hemangioendothelioma
• Incurable infections
• Liposarcoma
• Salvage procedure
• Type BIIIb rotationplasty

Rotationplasty had been reported as a salvage procedure for many decades. However, this procedure has not been used for unplanned fixation for pathological fracture of osteosarcoma. Therefore, this is the first case report of rotationplasty for this particular indication. Case Presentation. We report a case of a 22-year-old Thai female patient who sustained a supracondylar fracture at the distal femur and underwent a surgical treatment by open reduction and internal fixation with a distal femoral locking plate and screws. Follow-up radiographic imaging revealed that there were abnormal osteolytic lesions, and conventional high-grade osteosarcoma was diagnosed by a pathological study. There were no distant metastases from Computed Tomography (CT) scan or Technitium-99m bone scintography. After discussing with the patient for treatment options, rotationplasty was chosen for her definitive treatment after 3 courses of neoadjuvant chemotherapy. All of the contaminated tissues were removed during the surgery. The neurovascular bundles were preserved. A standard rotationplasty type A-1 according to the Winkelmann Classification was performed. Postoperative imaging showed satisfactory outcomes, and the wound healed uneventfully. The patient was able to move her ankle as a knee, and external prosthetic fitting was made. Adjuvant chemotherapy was given after a free margin with good tumor necrosis which was achieved as shown in the pathological study. At the patient's 3-year follow-up visit, she has stable size of lung nodules. She can walk with external prosthesis, limping slightly. Her new knee could move as expected, and she was satisfied with the result of the treatment.

Rotationplasty for unplanned fixation of pathological fracture is a complex procedure. Patients often do not select this type of treatment because of the cosmetic acceptance even though it yields a good functional result. Therefore, awareness of the pathological fracture should initially be taken into account to prevent inappropriate fixation which could result in an unnecessary amputation.

• Megaprosthesis
• Rotationplasty
• Sarcomas

Rotationplasty is used most often as a function-preserving salvage procedure after resection of sarcomas of the lower extremity; however, it is also used after infection of prosthetic knee joints. Conventional vascular management during rotationplasty is to preserve and coil major vessels, but recently, transection and reanastomosis of the major vessels has been widely performed. However, there has been little discussion regarding the optimal vascular management of rotationplasty after infection of prosthetic knee joints because rotationplasty is rarely performed for this indication. We reviewed four patients who had undergone resection of osteosarcomas of the femur, placement of a prosthetic knee joint, and rotationplasty with vascular reconstruction from 2010 to 2013. The mean interval between prosthetic joint replacement and rotationplasty was 10.4 years and the mean interval between the diagnosis of prosthesis infection and rotationplasty was 7.9 years. Rotationplasty was successful in all patients; however, in one patient, arterial thrombosis developed and necessitated urgent surgical removal and arterial reconstruction. All patients were able to walk independently with a prosthetic limb after rehabilitation. Although there is no consensus regarding the most appropriate method of vascular management during rotationplasty for revision of infected prosthetic joints, vascular transection and reanastomosis is a useful option.