Joris Oonk will defend the dissertation 'Patient specific distal radioulnar joint arthroplasty: Towards a novel implant design using four-dimensional computed tomography'. Supervisors are Prof. ir. G.J. Strijkers and Prof. M.J.P.F. Ritt. The co-supervisors are Dr ir. G.J. Streekstra and Dr J.G.G. Dobbe.