http://www.washingtontimes.com/news/2018/jul/23/3d-imaging-printing-speed-knee-replacement-recover/ > Severe arthritis and 26 years of high-impact activity took its toll on Bowie, Maryland, fitness instructor Howard Harriston, who endured countless painkilling injections and numerous operations to remove damaged cartilage from his left knee. > "I was afraid. ... I thought my career was over," he said.