Effects of static fixation and dynamization after interlocking femoral nailing locked with an external fixator: an experimental study in dogs

Veterinary Surgery : VS
I DurallJorge Franch

Abstract

To determine bone healing at 20 weeks, after either static fixation (SG) or after dynamization (DG) at 4 weeks in osteotomized canine femurs repaired with an interlocking nail (ILN) secured with a type I external skeletal fixator (ESF). Experimental study. Ten adult beagle dogs. After mid-diaphyseal femoral osteotomy, femurs in 10 dogs were repaired with an ILN secured with 4 (2 proximal, 2 distal) threaded custom pins (TP; 2.7-mm-diameter cortical screw with a 2-mm shaft attached to the screw head) to which 2 parallel connecting bars were attached in a type I ESF configuration. In 5 dogs, dynamization was performed at 4 weeks by removing the connecting bars and 2 distal screws. Limb function, range of motion of the stifle joint (ROMSJ), radiographic evidence of bone healing, and complications were studied for 20 weeks. Full limb function was achieved between 8 and 10 weeks in SG dogs, but a decreased ROMSJ was observed from 5 to 8 weeks. In DG dogs, full limb function occurred between 5 and 6 weeks except in 1 dog, and ROMSJ was considered normal in all dogs. Bone healing was not affected by dynamization. Average healing time for SG was 12.8 weeks, and for DG it was 13.6 weeks. Periosteal reaction at TP insertion points, osteo...Continue Reading

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Citations

Oct 9, 2012·The Veterinary Clinics of North America. Small Animal Practice·Loïc M DéjardinDirsko J F von Pfeil
Oct 1, 2010·Veterinary Surgery : VS·Matthieu Gatineau, Jérôme Planté
Jul 13, 2012·Proceedings of the Institution of Mechanical Engineers. Part H, Journal of Engineering in Medicine·Adam N GarlockPatrick J Atkinson

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