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Year 2017 - Volume 37, Number 12
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Interlocking nail system in comparison with dynamic compression plate in the stabilization of intertrochanteric varus osteotomy in dogs: study in cadavers, 37(12):1474-1478
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ABSTRACT.- Carneiro L.Z., Mistieri M.L.A., Cauduro C.R., Rosa A.F. & Pascon J.P.E. 2017. [Interlocking nail system in comparison with dynamic compression plate in the stabilization of intertrochanteric varus osteotomy in dogs: study in cadavers.] Haste intramedular bloqueada em comparação com placa de compressão dinâmica na estabilização de osteotomia intertrocantérica varizante em cães: estudo ex vivo. Pesquisa Veterinária Brasileira 37(12):1474-1478. Hospital Universitário Veterinário, Universidade Federal do Pampa, BR-472 Km 592, Uruguaiana, RS 97508-000, Brazil. E-mail: malimistieri@gmail.com
Considering the advantages of the interlocking intramedullary nail (IN) in relation to bone plates in the femoral stabilization, this study aimed to evaluate the feasibility and effectiveness of IN application post intertrochanteric varus osteotomy (IVO). For this purpose, 10 canines cadavers were used. On the left femurs, the fixation was obtained with IN (IN group) and rights fixed with dynamic compression plates and screws (plate group). Was compared the angles of Norberg and inclination of the head and femoral neck (IHF) before (T0) and after (T1) IVO. The results of time spent for placement of implants and biomechanical resistance to compression and torsion were also confronted between groups. There was an increase of the Norberg angle between T0 (106.84±5.55o) and T1 (111.22o±3.89), only in IN group (p<0.05). However, reduction of IHF angle after IVO (T1) was observed in both, the plate group (T0=127.6±4.70o e T1=110.06±10.61o, p<0.05) and IN group (T0=126.43±5.87o e T1=116.87± 8.62 o, p<0.05). The placement times of the implants did not differ statistically and only the compression biomechanical test revealed differences between groups, with greater resistance (P=0.033) of the plate group (863.3±74.46N/mm) compared to IN group (586.7±44.10N/mm). Thus, stabilization through IN was feasible and effective. Although the compression biomechanical results has demonstrated a higher fragility of IN in relation to the compression plate, their values are above the forces, reported in literature, acting in normal dog gait. |
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