[Hip Joint phylogenesis. Phenotypic plasticity. Lamarckian or Darwinian paradigm? Part II].

OBJECTIVE The aim of this work is to analyse the origin of phenotypic plastic changes into a biologic structure, in this case the hip. As a hypothesis of the work, the possibility that changes could be explained following the Lamarckian paradigm, opposed to the Darwinian paradigm, is shown. The section material and methods of this work have been published in part I. Studies in plants and fish have been added. DISCUSSION Results showed that the ball-and-socket design of the hip joint remains unchanged. Phenotype in the elements that form the hip joint tissues showed significant plastic changes. CONCLUSION Interpretation of our results suggest that changes in phenotype plasticity of the hip joint are immanent to phenotype and cannot be explained by following Lamarck's or Darwin's paradigm.