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Message: [QUOTE="Purple Haze, post: 2604984, member: 5843"] You can tell on an MRI if a tear is acute or chronic by a number of different characteristics that show up (i.e. bleeding in the joint, fraying of the ligament, and such), but you would not necessarily be able to date it to his junior year absent a prior exam - which it doesn't sound like ever took place. Could have been something he did in high school that just got worse over time. I agree with Jeremy - it is probably a partial ACL tear and those tend to deteriorate over time. Unlike a broken bone, ligament tears won't naturally repair themselves over time. [/QUOTE]