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Park, Kim, Cho, and Sim: Traumatic Disassembly of a Bipolar Hip Prosthesis - A Case Report -
Case Report
The Journal of the Korean Hip Society

The Journal of the Korean Hip Society 2011; 23(2): 151-154.

Published online: 30 June 2011

DOI: https://doi.org/10.5371/jkhs.2011.23.2.151

Traumatic Disassembly of a Bipolar Hip Prosthesis - A Case Report -

Bong-Ju Park, MD, Ju-Oh Kim, MD, Hong-Man Cho, MD, Joo-Hyun Sim, MD

Department of Orthopedic Surgery, Gwangju Veterans Hospital, Gwangju, Korea.

Address reprint request to Hong-Man Cho, MD. Department of Orthopedic Surgery, Gwangju Veterans Hospital, 887-1 Sanwol-dong, Gwangsan-gu, Gwangju 506-705, Korea. TEL: +82-62-602-6162, FAX: +82-62-602-6989, chm1228@hanmail.net

Received 22 April 2011       Revised 9 June 2011       Accepted 9 June 2011

Copyright © 2011 by Korean Hip Society

Abstract

We report a rare case of a complete disassembly of the inner head from the bipolar cup without polyethylene wear and locking system failure. An 84-year-old man who had a femur neck fracture of the right hip underwent a replacement of the bipolar prosthesis 4 months ago. He fell down from a height of a chair and felt a sudden sharp pain in the right hip. Roentgenograms revealed that the inner head was dislocated from the outer cup; subsequently, a revision surgery was carried out. When the outer head was removed from the acetabulum, the bearing insert and locking ring were not deformed. Because there was no evidence of loosening of the femoral stem, identicallysized bipolar cup and metal head replacement was performed. At a 6 months follow-up, he had mild hip pain but had returned fully to daily living.

Keywords: Bipolar prosthesis, Disassembly, Dislocation, Hemiarthroplasty

Figures and Tables

Fig. 1
The radiograph for patient shows dislocation of the inner head without a detached locking ring and varus position of the outer head.
jkhs-23-151-g001
Fig. 2
(A) Retrieved bipolar components without any damaged beveled over the outer head and wear of polyethylene insert. (B) A intact locking ring.
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Fig. 3
Postoperative radiograph demonstrates bipolar hemi arthroplasty without revision of the stem.
jkhs-23-151-g003

References

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