We experienced two cases of revision total hip arthoplasty (THA) with severe acetablar deficiencies, which we categorized as Type III according to the classification of the American Academy of Orthopaedic Surgeons (A. A. O. S). In the both cases, we reconstructed the acetablar defects with auto and allograft, using the KT-plate. The pallet of the KT-plate could not reach the host bone directly because of extensive bone loss of the acetablum. Accordingly, we grafted the autogenous tri-cortical iliac bone in the gap between the host bone and pallet of the KT-plate, and also morselized allograft in the remaining cavitary defects. At final examination 10 and 11 months after operation, both patients were relieved from hip joint pain and their walking ability had improved. There was no appearance of collapse of the grafted bone nor evidence of loosening up to the present.
