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. Author manuscript; available in PMC: 2019 Jun 4.
Published in final edited form as: Osteoarthritis Cartilage. 2018 Feb 7;26(4):569–579. doi: 10.1016/j.joca.2018.01.012

Fig. 2.

Fig. 2

(a) Sample ultrashort echo time (UTE)-T2* profile from an uninjured control subject t and from both knees of an anterior cruciate ligament (ACL)-reconstructed subject. Error bars represent ± standard deviation of UTE-T2* values measured along each level of tissue depth parallel to the subchondral plate. Straight lines between measured profile points are provided to facilitate visual appreciation of differences between the profiles. (b) Measured UTE-T2* profile values, the fitted four-parameter sigmoidal curve, and the 95% confidence band of the fitted curve for the same uninjured subject as shown in a demonstrating a good fit of the model to this uninjured control subject’s UTE-T2* profile data. (c) UTE-T2* profile values from both knees of the same ACL-reconstructed subject as shown in a. Profile slopes are calculated in the deepest 0–25% and middle 25–75% of cartilage (by averaging derivatives across points 1 through 5, and 5 through 13, respectively). Percent distance from bone is measured such that 0% indicates bone cartilage interface, 100% indicates synovial surface.