PMC4932162_01
Plain radiographs on first visit; the white arrow identifies the fabella.
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fig1
Plain radiographs of the right knee were obtained on the first visit (Figure 1). A fabella was identified at the posterior femoral condyle, 11 mm along the major axis of the fabella (Figure 1).
Plain, lateral view radiographs of the knee at several time points; the white arrow identifies the fabella and the black arrow onset and progression of osteoarthrosis.
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fig2
Comparison of plain radiographs of the right knee joint at several points in time confirmed presence of a fabella prior to surgery and progressive osteoarthrosis, with osteophyte formation, over the posterior femoral condyle over the 5- to 7-month post-TKA period (Figure 2).
Position of the femoral component and the fabella; the white arrow identifies the fabella.
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fig3
Review of computed tomography (CT) images obtained at 7 months post-TKA (Figure 3) identified a fabella, 11 x 10 mm in size, over the posterior femoral condyle.
Gross pathology of the excised fabella, confirming significant osteoarthrosis.
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fig4
The size of the fabella was 20 mm along the major axis, with osteophyte and deformation of the articular cartilage confirmed (Figure 4).