Ten-year follow-up of a proximal circumferential porous-coated femoral prosthesis: radiographic evaluation and stability

• Published in: Journal of orthopaedic science : official journal of the Japanese Orthopaedic Association 2002-01, Vol.7 (1), p.68-73
• Main Authors: Takatori, Yoshio, Nagai, Ichiro, Moro, Toru, Kuruta, Yoshihiro, Karita, Tatsuro, Mabuchi, Akihiko, Ninomiya, Setsuo
• Format: Article
• Language: English
• Subjects: Adult; Aged; Aged, 80 and over; Arthroplasty, Replacement, Hip - instrumentation; Arthroplasty, Replacement, Hip - methods; Biological and medical sciences; Bone Cements; Cementless; Coated Materials, Biocompatible; Coxarthrosis; Female; Femoral prosthesis; Follow-Up Studies; Hip Prosthesis; Humans; Male; Medical sciences; Middle Aged; Migration; Orthopedic surgery; Osteoarthritis, Hip - diagnostic imaging; Osteoarthritis, Hip - surgery; Porous coating; Probability; Prostheses; Prosthesis Design; Radiography; Retrospective Studies; Statistics, Nonparametric; Surgery; Surgery (general aspects). Transplantations, organ and tissue grafts. Graft diseases; Time Factors; Total hip replacement; Treatment Outcome
• ISSN: 0949-2658; 1436-2023
• DOI: 10.1007/s776-002-8420-1

We studied the radiographic findings on 48 hips in 48 patients to determine the stability of a proximal circumferential porous-coated femoral prosthesis in cementless total hip replacement. The patients had coxarthrosis related to acetabular dysplasia. The follow-up interval in the study was 10 to 13 years. In 36 patients, migration of the femoral component was equal to or less than 2mm. No patient showed progressive migration. Revision surgery was performed in 37 patients because of migration of the acetabular components. Intraoperatively, no femoral components demonstrated visible motion under stress of the implant–bone interface, and none had been revised. During the follow-up period, two patients had mild thigh pain. Two others sustained fracture of the femur 11 years after surgery due to a fall. Pedestal formation was observed in 39 patients and calcar rounding in 21. The mean diameter of the medullary cavity around the distal part of the prosthesis increased from 13.6 to 16.3mm average. We conclude that the proximal circumferential porous-coated femoral prosthesis is stable for more than ten years after surgery. The risk of subsequent periprosthetic fractures in elderly patients, however, is a matter of concern.