McCulloch Ryan S, Roe Simon C, Marcellin-Little Denis J, Mente Peter L
Department of Biomedical Engineering, North Carolina State University/University of North Carolina at Chapel Hill, Raleigh/Chapel Hill, NC, USA.
Vet Surg. 2012 Jan;41(1):163-7. doi: 10.1111/j.1532-950X.2011.00858.x. Epub 2011 Jul 19.
To compare: (1) the force required to initiate subsidence, and (2) the relative subsidence, of femoral stems implanted into intact femora, and then into the same femora in which an induced fissure had been stabilized by cerclage.
In vitro, mechanical study.
Femora (n=9) from 9 dogs.
Femora were prepared for implantation of an uncemented stem. Stems were implanted with continuous and impact loading. After axial loading until a fissure occurred, the stems were extracted, and the fissure stabilized with double-loop cerclage. Stems were reimplanted, and reloaded to failure.
Mean±SD load to initiate subsidence in intact femora was 1706±584 N compared with 2379±657 N for cerclaged bones (P=.002). Mean relative subsidence of intact femora was 3.99±2.09 mm compared with 1.79±2.99 mm for cerclaged bones (P=.091).
The load to initiate subsidence is increased in femora that have fissured, then have been stabilized with double-loop cerclage, when compared with intact femora. The relative subsidence is not different between intact and stabilized specimens.
比较：(1) 完整股骨植入股骨柄引发下沉所需的力，以及 (2) 完整股骨植入股骨柄后的相对下沉量，以及将股骨柄植入同一经环扎稳定了诱导裂缝的股骨后的上述情况。
体外力学研究。
9只犬的股骨（n = 9）。
准备股骨以植入非骨水泥型股骨柄。通过持续加载和冲击加载植入股骨柄。轴向加载直至出现裂缝后，取出股骨柄，用双环扎带稳定裂缝。重新植入股骨柄，并再次加载直至失效。
完整股骨引发下沉的平均±标准差负荷为1706±584 N，而环扎骨的这一负荷为2379±657 N（P = 0.002）。完整股骨的平均相对下沉量为3.99±2.09 mm，而环扎骨的为1.79±2.99 mm（P = 0.091）。
与完整股骨相比，出现裂缝后经双环扎稳定的股骨引发下沉的负荷增加。完整标本和稳定标本之间的相对下沉量没有差异。
