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Case Reports
. 2023 Sep 11;11(9):e7894.
doi: 10.1002/ccr3.7894. eCollection 2023 Sep.

Black discoloration of the knee articular cartilage in a patient with pigmented villonodular synovitis: A case report

Mohammad Ayati Firoozabadi  1 , S M Javad Mortazavi  1 , Hesam Toofan  2 , Marzieh Khalili  3 , Mohammad Javad Shariyate  4
Affiliations
Case Reports

Black discoloration of the knee articular cartilage in a patient with pigmented villonodular synovitis: A case report

Mohammad Ayati Firoozabadi et al. Clin Case Rep. .

Abstract

In this case report, total knee arthroplasty was performed in a patient with pigmented villonodular synovitis. During surgery, severe black discoloration of the articular cartilage and menisci was observed in the patient. According to literatures, this is the first case report of severe articular cartilage pigmentation in a patient with pigmented villonodular synovitis.

Keywords: PVNS; black cartilage; black menisci; case report; total knee arthroplasty.

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Conflict of interest statement

The authors declare that they have no conflict of interests.

Figures

FIGURE 1
FIGURE 1
Hip‐knee‐ankle radiographic with joint space narrowing, subchondral sclerosis, and osteophyte formation.
FIGURE 2
FIGURE 2
Knee joint effusion and popliteal cyst with internal debris which located posteriorly, suggesting the possibility of pigmented villonodular synovitis (PVNS).
FIGURE 3
FIGURE 3
Severe black pigmentation of the synovial membrane and menisci and pigmentation of the articular surface.
FIGURE 4
FIGURE 4
Postsurgical radiographic with acceptable alignment.
FIGURE 5
FIGURE 5
The lesion is composed of papillary, villous, nodular, and pseudoglandular or cleft like spaces with a synovial lining. Osteoclast‐like multinucleated giant cells and hemosiderin‐laden macrophages are seen. Histopathologic evaluation is compatible with pigmented villonodular synovitis (PVNS).
See this image and copyright information in PMC

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