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Sagittal sequence of the knee demonstrates a small partial-thickness defect (arrow) at the patellar cartilage (Whole-Organ MRI Score grade 2). The patellar cartilage defect was graded as normal by two trainees but was graded as a partial-thickness lesion by both the attending physicians in the first round of grading. In the second round of grading, the same lesion was recognized with the aid of the model and was graded as a partial-thickness lesion by all four readers.
