This week, Jonathan is joined by Nebojsa Skrepnik, the Director of Research at Tucson Orthopaedic Institute Research Center in Arizona, USA. They discuss Skrepnik’s career, how he ended up in the USA, and opening his own clinical research centre. The use of cobalt and chromium in prosthetics is also discussed, as well as how difficult-to-treat conditions such as tennis elbow can be treated with platelet-rich plasma.