Katsuhiko Maezawa1, Masahiko Nozawa2, Takahito Yuasa3, Kentaro Aritomi3, Seiki Ogawa3, Yuichiro Maruyama1, Kazuo Kaneko3. 1. Department of Orthopaedic Surgery, Juntendo Urayasu Hospital, Urayasu City, Chiba 279-0021, Japan. 2. Department of Orthopaedic Surgery, Juntendo Nerima Hospital, Nerima-ku, Tokyo 177-8521, Japan. 3. Department of Orthopaedic Surgery, Juntendo University School of Medicine, Bunkyo-ku, Tokyo 113-8421, Japan.
Abstract
BACKGROUND: The outcome of cementless total hip arthroplasty depends on many factors. We must not forget fundamental things those are design of outer surface of the component, that leads bone ingrowth into the prosthesis, better initial stability, and better insertional techniques. The purpose of this study was to review our experience with metal-on-metal total hip arthroplasty with a Wagner standard cup for patients who had acetabular dysplasia. PATIENTS AND METHODS: Fifty-four patients with 55 hips underwent primary metal-on-metal total hip arthroplasty (Metasul prosthesis) with a Wagner standard cup (44-48 mm in outer diameter) and were followed for a minimum of 10 years. All patients received the same type of cementless femoral component (Natural hip stem) and femoral head (28 mm in diameter). RESULTS: Seventeen of the 55 Wagner standard cups (30.9%) showed aseptic loosening over a mean period of 3.6 years after surgery, and there were no bone anchors on the outer surface of the 16 retrieved cups. CONCLUSION: From our experience, the small Wagner standard cup does not achieve sufficient osteointegration and we do not recommend the use of this cup, especially for patients with acetabular dysplasia and/or those with a small stature.
BACKGROUND: The outcome of cementless total hip arthroplasty depends on many factors. We must not forget fundamental things those are design of outer surface of the component, that leads bone ingrowth into the prosthesis, better initial stability, and better insertional techniques. The purpose of this study was to review our experience with metal-on-metal total hip arthroplasty with a Wagner standard cup for patients who had acetabular dysplasia. PATIENTS AND METHODS: Fifty-four patients with 55 hips underwent primary metal-on-metal total hip arthroplasty (Metasul prosthesis) with a Wagner standard cup (44-48 mm in outer diameter) and were followed for a minimum of 10 years. All patients received the same type of cementless femoral component (Natural hip stem) and femoral head (28 mm in diameter). RESULTS: Seventeen of the 55 Wagner standard cups (30.9%) showed aseptic loosening over a mean period of 3.6 years after surgery, and there were no bone anchors on the outer surface of the 16 retrieved cups. CONCLUSION: From our experience, the small Wagner standard cup does not achieve sufficient osteointegration and we do not recommend the use of this cup, especially for patients with acetabular dysplasia and/or those with a small stature.
Entities:
Keywords:
Aseptic loosening; Dysplastic hip; Metal-on-metal total hip arthroplasty; Wagner standard cup