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Fig. 3A. —Compartmental differences in glycosaminoglycan distribution (T1_Gd) index. Coronal T1_Gd image of 19-year-old woman obtained before surgery to repair anterior cruciate ligament injured 2 months earlier reveals overall mid-range index values. Low-range values (red areas) are seen at superficial boundaries and throughout lateral femoral condyle, with T1_Gd index (mean ± SD) of compartment measured at 340 ± 65 msec. Medial femoral condyle (MFC) and medial tibial plateau (MTP) have higher T1_Gd values (blue–green areas) than are seen in lateral femoral condyle (LFC) and lateral tibial plateau (LTP): MFC/LFC = 1.12, MTP/LTP = 1.25.