Support WBURProsthetics can cost up to $70,000. This influencer is running a marathon on crutchesPlay01:59Download AudioMansee KhuranaUpdated July 23, 2023 ShareAlex Parra, 22, will run in the San Francisco marathon on July 23 using crutches to call attention to how expensive prosthetics can be for people with amputated limbs. (Alex Parra)This article was originally published on July 21, 2023.