Kaj Klaue completed his Federal Diploma of Human Medicine at CHUV Lausanne in 1978 and subsequently gained his PhD thesis from the University of Basle. Dr. Klaue began his studies of the locomotor system as a research fellow at the Laboratory for Experimental Surgery, Davos, under the direction of S.M. Perren, performing multiple projects in vitro and in vivo, mainly on sheep. The rational context linking mechanical evidence with the biological response has always been dominant in his experimental and later clinical work. Dr. Klaue’s early work involved morphological analysis of the hip joint and optimization of reorientation osteotomies of the acetabulum, but his interest then turned to foot and ankle surgery. His fields of research have included development of a computerized 3-D imaging system for diagnostic purposes in orthopaedics and pre-operative simulation of corrective means, development of fixation plates, and improvement of foot and ankle reconstruction techniques; he is theholder of 15 patents. From 1993 to 2006 Dr. Klaue was a member of the Foot and Ankle Expert Group of the AO Technical Commission (AOFAEG). He currently works as an orthopaedic surgeon at the Clinica Luganese, Lugano, Switzerland. Dr. Klaue is a member of the editorial boards of Foot and Ankle Surgery and Revue de Médecine et Chirurgie du Pied.