ABSTRACT
This study was performed to assess the preliminary results, operative technique, complications and performance of the prosthetic reconstruction after the excision of bone sarcoma in the knee region. Nineteen patients with primary bone sarcoma of the distal end femur or proximal tibia had en-block resection of their tumor. The bone defect was reconstructed with a modular constrained tumor prosthesis. Fourteen cases had high grade lesions and five had low grade lesions. The median follow up period was 32 months. The 3-year overall disease free survival was 84%. The overall prosthetic survival rate was 79%. Satisfactory functional results were achieved in 73% of the patients. Distant metastasis was developed in five patients. Two patients had local recurrence and required amputation. Fourteen endoprosthetic related complications were developed. Infection, local recurrence and aseptic loosening were the most difficult complications which resulted in a failure of the procedure