Musculoskeletal conditions are the #1 reason for doctor visits among Americans. No one knows the concerns of patients afflicted with these bone, muscle, and joint issues better than Dr. Nicholas DiNubile. As the orthopedist to the Philadelphia 76ers, he presented his plan for treating and preventing general pain without surgery or drugs in his first book, FrameWork.

Now, in the second installment of his Active for Life series, Dr. DiNubile turns his attention to the estimated 21 million Americans who suffer from chronic knee pain. Beginning with an in-depth look at the causes...