Professor Marian Garlicki, head of the Orthopaedic Clinic, Warsaw, introduced me to the problems of low back pain and under his guidance I have investigated some of these problems over a period of years. While visiting Poland in 1966 professor Carl Hirsch invited me to Sweden in order both to deepen my knowledge of low back pain and to conduct original research into a problem associated with this syndrome. During the resulting stay in Gothenburg I have worked in the Biomechanics Laboratory of the Orthopaedic Clinic where I investigated the mechanical behaviour of the human longitudinal ligaments. I would especially like to express my gratitude to professor Carl Hirsch for the privilege of studying under his direction and for the warm friendship which he has always extended to me. I wish also to express my gratitude to: Professor Marian Garlicki for supporting my application to travel to Sweden and for his kind and valuable guidance of the first 14 years of my career. Professor of Civil Engineering, Columbia University, USA, Richard Skalak, for critical and helpful discussion of the technical aspects of this work. Fit. lie, Esbjorn Carlstrom for the supervision of the statistical analyses and fil. kand. Bo Eriksson for the necessary computation. Dr. Joseph Schatzker, Toronto, Canada, and mr. John Evans, M.Sc., Glasgow, Scotland, who translated this work and for their friendly advice and discussion. Ass. professors AlfNachemson and Ian Goldie, dr. Andrus Viidik, dr. Lars Sullivan and colleagues from the Orthopaedic Clinic for the valuable discussion and the cordial hospitality they extended to me which helped to make my stay in Gothenburg most memorable. Mrs. Birgitta Pande for deciphering and typing the draft manuscript. lng. Hans Hellstrom, mrs. lnga-Liza Elzer and miss Lena Johnsson for their diligent laboratory assistance and willing cooperation. I would also like to extend my sincere thanks to my colleagues of the Orthopaedic Clinic in Warsaw who have so ably performed my clinical duties in the past year.
Twenty three children with cerebral palsy, who were operated on upon before 1984, have been re-assessed. All the lower limb deformities were corrected in one surgical session. Review after five years included foot-switch measurements and assessment of video recordings. There were no recurrences, and gait ability showed normal growth-related development.
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