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I recommend that you start here:He did have a torn acl
http://physioworks.com.au/injuries-conditions-1/knee-ligament-injury
Grade 3 usually requires surgery. Grade 1 does not. Grade 2, sometimes.
Tannehill did not have a complete tear/grade 3, or he would have needed surgery. He had either a 1 or a 2. For both, the preferred treatment is to avoid ligament replacement surgery unless it is needed, as the surgery itself introduces a whole new world of potential problems.
Tl;Dr - wanting surgery for anything less than a complete tear is asinine.