Durall Ignacio, Falcón Carmelo, Díaz-Bertrana M Carmen, Franch Jorge
Departamento de Medicina y Cirugía Animal, Facultad de Veterinaria, Universidad Autónoma de Barcelona, Barcelona, Spain.
Vet Surg. 2004 Jul-Aug;33(4):323-32. doi: 10.1111/j.1532-950X.2004.04047.x.
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, osteolysis around the thread and head of TPs were observed in both groups. A windshield-wiper effect was observed at the tip of 1 ILN.
ILN locked with a type I ESF can be used for fixation of mid-shaft femoral fractures. Dynamization at 4 weeks did not affect bone healing but did prevent stifle ankylosis and promoted earlier limb function.
ILN locked with a type I ESF is seemingly a feasible method for repair of mid-shaft femoral fractures and may decrease risk of nail failure.
在使用I型外固定架（ESF）固定的交锁髓内钉（ILN）修复截骨的犬股骨中，确定在4周时进行静态固定（SG）或动力化（DG）后20周时的骨愈合情况。
实验研究。
10只成年比格犬。
在股骨干中段截骨后，用ILN修复10只犬的股骨，ILN用4枚（近端2枚，远端2枚）带螺纹的定制钢针（TP；直径2.7 mm的皮质骨螺钉，螺钉头部连接2 mm的杆）固定，并以I型ESF构型连接2根平行连接杆。在5只犬中，4周时通过移除连接杆和2枚远端螺钉进行动力化。对肢体功能、 stifle关节活动范围（ROMSJ）、骨愈合的影像学证据和并发症进行了20周的研究。
SG组犬在8至10周时实现了完全肢体功能，但在5至8周时观察到ROMSJ降低。在DG组犬中，除1只犬外，在5至6周时实现了完全肢体功能，所有犬的ROMSJ均被认为正常。动力化不影响骨愈合。SG组的平均愈合时间为12.8周，DG组为13.6周。两组均观察到TP插入点的骨膜反应、TP螺纹和头部周围的骨质溶解。在1枚ILN的尖端观察到雨刮器效应。
用I型ESF锁定的ILN可用于股骨干中段骨折的固定。4周时的动力化不影响骨愈合，但可防止stifle关节强直并促进早期肢体功能恢复。
用I型ESF锁定的ILN似乎是修复股骨干中段骨折的可行方法，可能降低髓内钉失败的风险。
