Comparision of two kinds of intramedullary nail in fixing femoral fractures in goats

Objective Toestablish femoral fracture models in goats,and compare the effect of using carmulated interlocking intramedullary nail and intramedullary nail with tail wire.Methods 40 adult male goats were selected,and the bilateral posterior middle femoral fracture models were artificially established.Twenty goats were fixed with cannulated interlocking intramedullary nail (group A),and 20 with intramedullary nail with tail wire (group B).X-ray examination was done at 4th and 8th week postoperatively and the nails were removed after fractures were healed.All the operative data were recorded and analyzed statistically.Results All fractures were healed in about 8 weeks postoperatively.Implanting operative time was (37.9 ± 5.1) min,blood loss was (38.0 + 66.0) mL,intraoperative fluoroscopy time was (6.8 + 3.1) s,and removal operative time was (24.4 + 5.3) min,blood loss was (26.3 ± 7.8) mL in group B,which were significantly different from those in group A (P ＜ 0.05 for all).End cap falls in both groups had no significant differences (P ＞ 0.05).One goat in group B was died after the implanting operation.Conclusion Intramedullary nail with tail wire in fixing femoral fractures has the same effects as cannulated interlocking intramedullary nail,but it has many advantages,including shorter operative time,less blood loss and X-ray exposure,and simple steps. Key words: Goats;  Femoral fracture;  Intramedullary nail with tail wire;  Cannulated interlocking intramedullary nail;  Intramedullary nail removal operation