Early failure of modern metal-on-metal total hip arthroplasty using a Wagner standard cup.
In 54 patients (1 man and 53 women), 55 hips underwent primary metal-on-metal total hip arthroplasty (Metasul) with a Wagner standard cup (44-48 mm in outer diameter) and were followed for a minimum of 3 years. All patients received the same type of cementless femoral component (Natural Hip Stem) and femoral head (28 mm in diameter). Twelve (21.8%) of the 55 Wagner standard cups showed aseptic loosening over a mean period of 31 months postoperatively, and there were no bone anchors on the outer surface of the 9 retrieved cups. From our experience, the small Wagner standard cup does not achieve sufficient osteointegration and we do not recommend use of this cup, especially for dysplastic hips.
Maezawa
Katsuhiko
K
Department of Orthopaedic Surgery, Juntendo University School of Medicine, Bunkyo-ku, Tokyo, Japan.
Nozawa
Masahiko
M
Matsuda
Keiji
K
Yuasa
Takahito
T
Shitoto
Katsuo
K
Kurosawa
Hisashi
H
D000328:Adult; D000368:Aged; D001172:Arthritis, Rheumatoid / Q000601:surgery; D019644:Arthroplasty, Replacement, Hip; D005260:Female; D006622:Hip Prosthesis; D006801:Humans; D008297:Male; D008875:Middle Aged; D010003:Osteoarthritis / Q000000981:diagnostic imaging / Q000601:surgery; D010020:Osteonecrosis / Q000601:surgery; D011474:Prosthesis Design; D011475:Prosthesis Failure; D011859:Radiography