Fig. 1
![Fig. 1](http://media.springernature.com/full/springer-static/image/art%3A10.1186%2Fs43055-019-0102-z/MediaObjects/43055_2019_102_Fig1_HTML.png)
Thirty-three-year-old man with knee pain, 3D WATC-s image (a) showing normal cartilage thickness displaying bright signal intensity on WATS-c image with superficial linear area of low signal intensity in lateral patellar articular facet in keeping with grade 1 chondromalacia. FS-PD image (b) show corresponding linear area of abnormal high signal intensity on low signal of cartilage with reversing signal seen in WATS-c sequence