We report the use of contained impacted morsellized allograft to revise an aseptically loose, massive distal femoral endoprosthetic replacement in a 27-year old Caucasian lady. The prosthesis was inserted 4 years earlier, following neo-adjuvant chemotherapy and resection of a distal femoral high grade osteosarcoma. Impaction grafting was used to restore bone stock and maintain femoral length. The patient remains disease-free, with excellent function, at two years after revision with no evidence of loosening and maintenance of bone stock. This is the first time this technique has been used in revision of a distal femoral endoprosthetic replacement.