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Journal of Long-Term Effects of Medical Implants
SJR: 0.332 SNIP: 0.491 CiteScore™: 0.89

ISSN Print: 1050-6934
ISSN Online: 1940-4379

Journal of Long-Term Effects of Medical Implants

DOI: 10.1615/JLongTermEffMedImplants.v12.i1.40
10 pages

Frictional Torque and Wear of Retrieved Hip Prostheses: A Comparison Between Alumina/PE and Co-Cr/PE Prostheses

Atsushi Kusaba
Department of Orthopaedic Surgery, Showa University Fujigaoka Hospital, 1-30 Fujigaoka, Aoba-Ku, Yokohama, Kanagawa 227-8501 Japan
Yoshikatsu Kuroki
Department of Orthopaedic Surgery, Showa University Fujigaoka Hospital, 1-30 Fujigaoka, Aoba-Ku, Yokohama, Kanagawa 227-8501 Japan
Saiji Kondo
Institute for Joint Replacement and Rheumatology, Ebina General Hospital, Kanagawa, Japan
Isao Hirose
Department of Orthopaedic Surgery, Showa University Fujigaoka Hospital, 1-30 Fujigaoka, Aoba-Ku, Yokohama, Kanagawa 227-8501 Japan
Yuichi Ito
Department of Orthopaedic Surgery, Showa University Fujigaoka Hospital, 1-30 Fujigaoka, Aoba-Ku, Yokohama, Kanagawa 227-8501 Japan
Yoshio Shirasaki
Department of Biomechanics, National Engineering Laboratory, 1-2 Namiki, Tsukuba, Ibaragi 305-8504 Japan
Tetsuta Tateishi
Department of Biomechanics, National Engineering Laboratory, 1-2 Namiki, Tsukuba, Ibaragi 305-8504 Japan
Jorg Scholz
Department of Orthopaedic Surgery, Auguste-Viktoria Hospital, 125 Rubensstrasse, D-12157 Berlin, Germany

ABSTRACT

Frictional torque and wear were measured in 67 retrieved cups with internal diameters of 32 mm. Thirty cups were combined with alumina heads and 37 were combined with metal heads. A lower prevalence of cup loosening was observed in alumina-polyethylene implants than in metal-polyethylene implants. No relation between frictional torque and stability of implants was detected for either type, whereas retrieved cups of alumina—polyethylene implants showed lower frictional torque than those of metal-polyethylene implants. Less wear was observed in the cups of alumina-polyethylene implants (0.13 mm/y) than in those of metal—polyethylene implants (0.19 mm/y). Less wear was observed in cups without loosening than in those with loosening in both types. These results suggest that wear has a greater influence on the stability of cups than frictional torque.