The Łódź Branch of the Polish Orthopedics and Traumatology Society (PTO i Tr.) was founded an march 10, 1951. The first Board was selected at the plenary PTO i Tr. meeting on May 7, 1951. The aim of the first Board was to make up for the inadequacies of orthopedic and trauma care in our region and assure orthopedic it's due place in the medical sciences. It also encouraged it's members to take-up scientific and social work. In the past years the number of Branch members grew from 18 to 169, proportionately to the number of new orthopedic and trauma care facilities in Łódź and it's surroundings. The members of the Branch participated in local scientific meetings a domestic PTO i Tr. congresses as well in congresses abroad. They delivered on the local meetings near 1401 research reports, which level were high. 81 members received Ph. D. and 9 of them achieve the degree of D. M. Sc. The average frequency at the scientific local meetings was 33%. From 1951 to 2000 members of Łódź Branch presented 192 papers in 23 domestic congresses of PTO i Tr. and published 325 papers as well 15 communications in organ of PTO i Tr. Łódź Branch organised three domestic meetings so called Orthopaedic Days in 1951 and 1960 as well three congresses in 1966, 1984 and 1998. Its members were also included in General Board of PTO i Tr.