Fig. 2
The oversight in the preoperative MRI case. a The arthroscopy showed 11 × 18 mm grade 4 cartilage injury in the trochlea. b The arthroscopy showed 10 × 10 mm grade 3 cartilage injury in the lateral femoral condyle. c His preoperative MRI showed the unevenness of articular cartilage with associated effusions in T2-weighted sequences in the trochlea. d His preoperative MRI showed the unevenness of articular cartilage with associated effusions in T2-weighted sequences in the lateral femoral condyle