Femoral trochlear dysplasia (FTD) is one of the common causes of early injury of knee cartilage in young people, and most of patients of FTD with the history of patellar dislocation, which seriously affects the quality of patients’ life. We focus on all the lateral, medial, deep and superficial layers of both patella and femoral trochlear cartilage in young people with quantitative T2 mapping. We find the superficial layers of lateral patellofemoral cartilage is mainly dehydration change in FTD, and there is more range of cartilage biochemical changes in age<30 years, compared to in age≧30 years, because the controls may appear the cartilage degeneration with increased in age. Compared to the type A of FTD, there are more and wider areas of cartilage dehydration in type B-D, and one of them involve the deep layer and show edema.
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