In this week's Medical Breakthroughs from Penn Medicine, Dr. Michael Ruckenstein, director of the Center for Implantable Hearing Devices at Penn Medicine, discusses with host Dr. Lee Freedman the only human sense for which total loss can be medically restored: hearing. They talk about which patients with hearing loss might benefit from a cochlear implant instead of a hearing aid. And they'll explore what we know so far about personal music players' role in hearing loss.