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Case Report
 
An unusual case of pigmented villonodular synovitis after unicompartmental knee arthroplasty
Tomohiro Onodera1, Hiroshi Tanji2, Tokifumi Majima3, Tamotsu Kamishima4, Akio Minami1
1MD, PhD, Department of Orthopaedic Surgery Hokkaido University Graduate School of Medicine, North 15 West 7, Kita–Ku, Sapporo 060–8638, JAPAN.
2MD, Sansokai Clark Hospital 2–4 honmachi, Higashi–Ku, Sapporo 065–0042, JAPAN.
3MD, PhD, Department of Joint Replacement and Tissue Engineering Hokkaido University Graduate School of Medicine North 15 West 7, Kita–Ku, Sapporo 060–8638, JAPAN.
4MD, PhD, Department of Biomedical Sciences and Engineering Hokkaido University Graduate School of Health Science North 12 West 5, Kita–Ku, Sapporo 060–0812, JAPAN.

doi:10.5348/ijcri-2012-09-173-CR-3

Address correspondence to:
Tokifumi Majima, MD, Ph.D
Department of Joint Replacement and Tissue engineering, Hokkaido University Graduate School of Medicine
North 15 West 7, Kita–Ku
Sapporo 060–8638
JAPAN
Phone: (+81) –11–706–5935
Fax: (+81) –11–706–6054
Email: tkmajima@med.hokudai.ac.jp

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How to cite this article:
Onodera T, Tanji H, Majima T, Kamishima T, Minami A. An unusual case of pigmented villonodular synovitis after unicompartmental knee arthroplasty. International Journal of Case Reports and Images 2012;3(9):9–12.


Abstract
Introduction: Pigmented villonodular synovitis (PVNS) after replacement arthroplasty is a potential cause of postoperative pain and hemarthrosis. The disease is difficult to diagnose after arthroplasty, since magnetic resonance imaging (MRI) appearances are subject to metal artifact making them less than ideal.
Case Report: A case of a 61-year-old woman with PVNS after unicompartmental knee arthroplasty (UKA). She was treated with an arthroscopic synovectomy with good result.
Conclusion: MRI evaluation of the residual side of the knee joint after UKA is valuable for the differential diagnosis of PVNS.

Key Words: Pigmented villonodular synovitis (PVNS), Unicompartmental knee arthroplasty (UKA), Hemarthrosis, magnetic resonance imaging (MRI)


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Author Contributions:
Tomohiro Onodera – Substantial contributions to conception and design, Analysis and interpretation of data, Drafting the article, revising it critically for important intellectual content, Final approval of the version to be published
Hiroshi Tanji – Substantial contributions to conception and design, acquisition of data, Drafting the article, Final approval of the version to be published
Tokifumi Majima – Substantial contributions to conception and design, Revising it critically for important intellectual content, Final approval of the version to be published
Tamotsu Kamishima – Analysis and interpretation of data , Drafting the article, Final approval of the version to be published
Akio Minami – Substantial contributions to conception and design, Revising it critically for important intellectual content, Final approval of the version to be published
Guarantor of submission:
The corresponding author is the guarantor of submission.
Source of support:
None
Conflict of interest:
Authors declare no conflict of interest.
Copyright:
© Tomohiro Onodera et al. 2012; This article is distributed the terms of Creative Commons Attribution License which permits unrestricted use, distribution and reproduction in any means provided the original authors and original publisher are properly credited. (Please see Copyright Policy for more information.)