Fig. 3

a Sagittal fat-suppressed proton density-weighted image shows a preserved signal intensity of the articular cartilage of the anterior aspect of medial femoral condyle with uniform cartilage thickness (blue arrow). b and c The corresponding T2 map shows increased cartilage T2 relaxation time (ROI). b: 0 ms ≤ T2 ≤ 39 ms; c: T2 = 63 ms)