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Fachbereich Veterinärmedizin



    The course of bone healing is influenced by the initial shear fixation stability (2005)

    Zeitschriftenartikel / wissenschaftlicher Beitrag
    Schell, H
    Epari, D R
    Kassi, J P
    Bragulla, H
    Bail, H J
    Duda, G N
    Journal of orthopaedic research : official publ. of the Orthopaedic Research Society and the Bioelectric Repair and Growth Society
    Bandzählung: 23
    Heftzählung: 5
    Seiten: 1022 – 8
    ISSN: 0736-0266
    Pubmed: 15878254
    Institut für Veterinär-Anatomie

    Koserstr. 20
    14195 Berlin
    +49 30 838 53555

    Abstract / Zusammenfassung

    Fracture healing is influenced by fixation stability and experimental evidence suggests that the initial mechanical conditions may determine the healing outcome. We hypothesised that mechanical conditions influence not only the healing outcome, but also the early phase of fracture healing. Additionally, it was hypothesised that decreased fixation stability characterised by an increased shear interfragmentary movement results in a delay in healing. Sixty-four sheep underwent a mid-shaft tibial osteotomy which was treated with either a rigid or a semi-rigid external fixator. Animals were sacrificed at 2, 3, 6 and 9 weeks postoperatively and the fracture callus was analysed using radiological, biomechanical and histological techniques. The tibia treated with semi-rigid fixation showed inferior callus stiffness and quality after 6 weeks. At 9 weeks, the calluses were no longer distinguishable in their mechanical competence. The calluses at 9 weeks produced under rigid fixation were smaller and consisted of a reduced fibrous tissue component. These results demonstrate that the callus formation over the course of healing differed both morphologically and in the rate of development. In this study, we provide evidence that the course of healing is influenced by the initial fixation stability. The semi-rigid fixator did not result in delayed healing, but a less optimal healing path was taken. An upper limit of stability required for successful healing remains unknown, however a limit by which healing is less optimal has been determined.