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Case Reports in Medicine
Volume 2009, Article ID 257136, 3 pages
Case Report

Dislocation after Hemiarthroplasty due to Insufficiency Fracture of the Superior Acetabulum: A Case Report

1Department of Orthopaedic Surgery, Juntendo University Nerima Hospital, 3-1-10 Takanodai, Nerima-ku, Tokyo 117-8521, Japan
2Department of Orthopaedic Surgery, Asakusa Hospital, 1-10-12 Higashi Asakusa, Taitou-ku, Tokyo 111-0025, Japan
3Department of Orthopaedic Surgery, Juntendo University Hospital, 2-1-1 Hongo, Bunkyo-ku, Tokyo 113-8421, Japan

Received 17 March 2009; Accepted 22 June 2009

Academic Editor: Mary A. Keenan

Copyright © 2009 Masahiko Nozawa et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Insufficiency fracture of the superior part of the acetabulum after hemiarthroplasty has not been reported before. Here we report a case of dislocation after hemiarthroplaty due to insufficiency fracture of the acetabulum. In our patient, insufficiency fracture of the ilium immediately above the acetabulum produced obvious evidence of compression and collapse that led to dislocation of the outer head of the femoral component. This patient had subsequently been treated with a cementless socket inserted into the fractured acetabulum. We should remember the possibility of insufficiency fracture of the superior acetabulum after hemiarthroplasty, particularly in elderly patients suffering from chronic postoperative pain and disability.