Ultrasonographic Assessment of the Normal Femoral Articular Cartilage of the Knee Joint: Comparison with 3D MRI

Figure 3

Suprapatellar MR image of the femoral sulcus cartilage (a) and the corresponding US image (b). These images show that the bone (^#) to cartilage () interface and, in particular, the cartilage to anterior soft tissue interface are slightly blurred on MRI (a) as compared to US (b) where these interfaces are clearly defined. This could explain the overestimation of cartilage thickness in MRI measurements. Cartilage thickness of the central sulcus () was measured at 3.0 mm in MRI and 2.4 mm in US image.