Knee

 Washington Post: A torn ACL can heal itself, new study shows. Surgeons disagree. The finding that surgery may not be needed for ACL injuries could redefine future treatment and suggests that the knee is more resilient than previously believed By Gretchen Reynolds

But the new research, which focused on 80 injured knees, found that many torn ACLs can apparently knit themselves back together and heal naturally — reducing the need for expensive and often painful surgery.