Nano Biomedicine
Analysis of Wear Debris Generated from the Metal-on-metal Hip Joint

Motohiro UO1, Fumio WATARI1, Kiyotaka ASAKURA2, Naoyuki KATAYAMA3, Shin ONODERA4, Harukazu TOHYAMA4, Koichi HAMADA5, and Somei OHNUKI5

1Department of Biomedical Materials and Engineering, Graduate School of Dental Medicine, Hokkaido University, Sapporo, Japan
2Catalyst Research Center, Hokkaido University, Sapporo, Japan
3Hokkaido Orthopedics Memorial Hospital, Sapporo, Japan
4Department of Sports Medicine & Joint Reconstruction Surgery, Graduate School of Medicine, Hokkaido University, Sapporo, Japan
5Division of Materials Science, Graduate School of Engineering, Hokkaido University, Sapporo, Japan

Nano Biomedicine 2009;1(2): 133-136, (Dec 30)

The elemental concentration, shape and chemical state of debris contained in the articular capsules of metal-on-metal hip joints were examined. Co derived from Co-Cr alloy was detected with high concentration. By TEM observation, some larger debris in several hundred nanometers and a lot of smaller debris smaller than several ten nanometers were observed. The debris could be observed in the severe metallosis region. Most of Co contained in the articular capsules could be estimated as the metallic state by fluorescence XAFS analysis, which provides high sensitivity for chemical state analysis. Therefore, the metallosis of the articular capsule could be assumed as mainly caused by the metallic debris.

Key words: wear debris, hip joint, Co-Cr alloy, XAFS

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