title: [Biomechanical examination of stress distribution in the femoral neck for varus-implanted and valgus-implanted cups (author's transl)].
abstract: The contents of this contribution pertain to the above mentioned article of Gerngross et al. The problem of fracture propagation is indeed of very local character, limited either to the discontinuity in the immediate neighbourhood of the cup lip or to the notch accidentally formed in the femoral neck by the milling cutter during surgery. Strain measurements performed far removed from the area of stress concentration do not bear sufficient evidence to support the conclusions drawn. The presentation of results is misleading because a comparison of stress or strain within the bone at chosen moments during the walking cycle is valid only if the relevant loading conditions, with respect to direction as well as magnitude, are applied. Finally, the description of the strain measurement and evaluation procedure is inadequate and questionable.
mesh_terms: D001696:Biomechanical Phenomena; D005265:Femoral Neck Fractures / Q000503:physiopathology / Q000601:surgery*; D005270:Femur Head / Q000503:physiopathology; D005272:Femur Neck / Q000503:physiopathology; D006622:Hip Prosthesis; D006801:Humans
vernacular_title: Biomechanische Untersuchungen zur Varus-Valgus-Problematik der Schalenprothese nach Wagner.