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A Biomechanical Comparison of 3.5 Locking Compression Plate Fixation to 3.5 Limited Contact Dynamic Compression Plate Fixation in a Canine Cadaveric Distal Humeral Metaphyseal Gap Model

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dc.contributor.authorFilipowicz, Deanen
dc.contributor.committeechairLanz, Otto I.en
dc.contributor.committeememberCarrig, Colin B.en
dc.contributor.committeememberMcLaughlin, Ronalden
dc.contributor.departmentVeterinary Medical Sciencesen
dc.date.accessioned2014-03-14T20:39:56Zen
dc.date.adate2008-07-25en
dc.date.available2014-03-14T20:39:56Zen
dc.date.issued2008-05-30en
dc.date.rdate2012-10-01en
dc.date.sdate2008-06-13en
dc.description.abstractObjective- To compare the biomechanical properties of 3.5 locking compression plate (LCP) fixation to 3.5 limited contact dynamic compression plate (LC-DCP) fixation in a canine cadaveric, distal humeral metaphyseal gap model in static axial compression and cyclic axial compression and torsion. Study Design- Biomechanical in vitro study. Sample Population- 30 paired humeri from adult, medium to large breed dogs. Methods- Testing was performed monotonically to failure in axial compression on ten pairs of humeri, cyclically in axial compression for 10,000 cycles on ten pairs and cyclically in torsion for 500 cycles on the last ten pairs. Results- Humeral constructs stabilized with LCPs were significantly stiffer than those plated with LC-DCPs when loaded in axial compression (P=0.0004). When cyclically loaded in axial compression over 10,000 cycles, the LC-DCP constructs were significantly stiffer than those constructs stabilized with LCPs (P=0.0029). Constructs plated with LC-DCPs were significantly more resistant to torsion over 500 cycles than those plated with LCPs (P<0.0001), though no difference was detected during the first 280 cycles. Conclusions- The increased stiffness of LCP constructs in monotonic loading compared to constructs stabilized with non-locking plates may be attributed to the stability afforded by the plate-screw interface of locking plates. The LCP constructs demonstrated less stiffness in dynamic testing in this model, likely due to plate-bone offset secondary to non-anatomic contouring and occasional incomplete seating of the locking screws when using the torque-limiting screw driver. Clinical Relevance- LCPs yield less stiff fixation under dynamic loading than conventional LC-DCPs when applied to severely comminuted, metaphyseal fractures. Improving anatomical contouring of the plate and insuring complete screw insertion into the locking plate hole may improve stiffness when using LCPs in comminuted fractures.en
dc.description.degreeMaster of Scienceen
dc.identifier.otheretd-06132008-134745en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-06132008-134745/en
dc.identifier.urihttp://hdl.handle.net/10919/33558en
dc.publisherVirginia Techen
dc.relation.haspartDeanFilipowiczThesis.pdfen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectfracture modelen
dc.subjectaxial compressionen
dc.subjectcyclic torsionen
dc.subjectLCPen
dc.subjectLC-DCPen
dc.titleA Biomechanical Comparison of 3.5 Locking Compression Plate Fixation to 3.5 Limited Contact Dynamic Compression Plate Fixation in a Canine Cadaveric Distal Humeral Metaphyseal Gap Modelen
dc.typeThesisen
thesis.degree.disciplineVeterinary Medical Sciencesen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.levelmastersen
thesis.degree.nameMaster of Scienceen

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