Department of Orthopaedics and Biomechanics;
University of Ioannina;
Medical School;
Department of Ortho-paedic Surgery;
University Hospital of Patras;
University of Patras;
Medical School;
Department of Anatomy;
Histology;
Embryology;
University of Patras;
Medical School;
Avascular; necrosis; Femoral; head; Tantalum; rod; Survival; Bone; grafting;