The dynamisation of locking plate osteosynthesis by means of dynamic locking screws (DLS)-an experimental study in sheep
| Autor: | Robert Frigg, Rudolf Koch, Jörg A Auer, Stephen J. Ferguson, Michèle Sidler, Alexander Bürki, Michael Plecko, Katja Nuss, Brigitte von Rechenberg, Peter W Kronen, Daniel Andermatt, Nico Lagerpusch, Ulrich Stoeckle, Karina Klein |
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| Přispěvatelé: | University of Zurich, von Rechenberg, Brigitte |
| Rok vydání: | 2011 |
| Předmět: |
Callus formation
medicine.medical_treatment Bone Screws Human bone 610 Medicine & health Bone healing Osteotomy Locking plate Fracture Fixation Internal 2732 Orthopedics and Sports Medicine Osteogenesis medicine Animals Tibia Bony Callus General Environmental Science Fracture Healing Osteosynthesis Sheep business.industry Anatomy Compression (physics) 10021 Department of Trauma Surgery General Earth and Planetary Sciences Female 10090 Equine Department 2711 Emergency Medicine business Bone Plates Biomedical engineering |
| Zdroj: | Injury. 44(10) |
| ISSN: | 1879-0267 |
| Popis: | In this in vivo study a new generation of locking screws was tested. The design of the dynamic locking screw (DLS) enables the dynamisation of the cortex underneath the plate (cis-cortex) and, therefore, allows almost parallel interfragmentary closure of the fracture gap. A 45° angle osteotomy was performed unilaterally on the tibia of 37 sheep. Groups of 12 sheep were formed and in each group a different osteotomy gap (0, 1 and 3mm) was fixed using a locking compression plate (LCP) in combination with the DLS. The healing process was monitored radiographically every 3 weeks for 6, respectively 12 weeks. After this time the sheep were sacrificed, the bones harvested and the implants removed. The isolated bones were evaluated in the micro-computed tomography unit, tested biomechanically and evaluated histologically. The best results of interfragmentary movement (IFM) were shown in the 0mm configuration. The bones of this group demonstrated histomorphometrically the most distinct callus formation on the cis-cortex and the highest torsional stiffness relative to the untreated limb at 12 weeks after surgery. This animal study showed that IFM stimulated the synthesis of new bone matrix, especially underneath the plate and thus, could solve a current limitation in normal human bone healing. The DLS will be a valuable addition to the locking screw technology and improve fracture healing. |
| Databáze: | OpenAIRE |
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