This is the second part of a video to introduces users to the Bone Ninja app for iPad, a teaching tool developed by orthopedic surgeons Dr. Shawn Standard and Dr. John Herzenberg at the International Center for Limb Lengthening. It is designed to help surgeons learn to analyze long bone deformities by drawing lines, measuring angles, measuring lengths and manipulating bone fragments to make osteotomies (bone cuts) used in deformity correction. For more information and a link to download the app, please see the Bone Ninja App for iPad page.