MIAMI (EGMN) – More than half of adolescent athletes who experience an anterior cruciate ligament injury can develop long-term knee problems, even if surgery allows a relatively quick return to sports. ACL injury is “the gift that keeps on giving,” with 50%-60% of adolescent athletes developing an arthritic knee 15 years down the road, regardless of whether they had surgery, Dr. Jordan D. Metzl said. “Knees can appear to be 20-30 years older than they are at age 30 years if the patient had an...