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Kim, Moon, Lee, Kim, and Lee: Gout Tophi in the Bipartite Patella - A Case Report -
Case Report
Journal of the Korean Orthopaedic Association

Journal of the Korean Orthopaedic Association 2008; 43(1): 139-142.

Published online: 29 February 2008

DOI: https://doi.org/10.4055/jkoa.2008.43.1.139

Gout Tophi in the Bipartite Patella - A Case Report -

Myung-Ku Kim, M.D., Kyoung-Ho Moon, M.D., Tong-Joo Lee, M.D., Lucia Kim, M.D.*, Joong-Sun Lee, M.D.

Department of Orthopedic Surgery, Inha University College of Medicine, Incheon, Korea.

*Department of Pathology, Inha University College of Medicine, Incheon, Korea.

Address reprint requests to Tong-Joo Lee, M.D. Department of Orthopaedic Surgery, Inha University Hospital, 7-206, Sinheung-dong 3-ga, Jung-gu, Incheon 400-103, Korea. Tel: +82.32-890-3664, Fax: +82.32-890-3047, TJLEE@inha.ac.kr

Copyright © 2008 The Korean Orthopaedic Association

Abstract

Osteolysis of the patella occurs in benign or malignant bone tumors, metastatic disease, osteolytic infections, degenerative, or metabolic bone disease. Several cases of patellar destruction secondary to gout have been reported. However, there has only been one case of bipartite patellar bone destruction secondary to gout reported in the literature. We encountered a patient with an osteolytic lesion of the bipartite patella suggesting a bone tumor or metabolic bone disease. A biopsy and histology examination suggested a diagnosis of gout tophi. This case demonstrated bilateral bipartite patella with gout involvement on the plain roentgenograms.

Keywords: Bipartite patella, Gout

Figures and Tables

Fig. 1
Plain radiographs of the knee. (A, B) Both knee AP and lateral view showing an osteolytic lesion with cortical breakage on the superolateral portion of thepatella. (C) Both knee skyline view showing an osteolytic lesion on the lateral portion of the patella.
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Fig. 2
Sagittal images of the knee MRI. (A) Sagittal T1-weighted MRI of the knee demonstrating a multilobulated intermediate signal intensity mass in the superolateral aspect of the patella. (B) Sagittal T2-weighted image showing heterogeneous high signal intensity.
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Fig. 3
Photomicrograph shows amorphous deposits of needle-shaped crystals (arrow) associated with mononuclear and giant cell inflammation (curved arrow) (H&E stain, ×200).
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Fig. 4
There are needle-shaped crystals (arrow) on polarized optical microscopy.
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