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Resistance to Subsidence of an Uncemented Femoral Stem After Cerclage Wiring of a Fissure
Author(s) -
McCulloch Ryan S.,
Roe Simon C.,
MarcellinLittle Denis J.,
Mente Peter L.
Publication year - 2012
Publication title -
veterinary surgery
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.652
H-Index - 79
eISSN - 1532-950X
pISSN - 0161-3499
DOI - 10.1111/j.1532-950x.2011.00858.x
Subject(s) - medicine , subsidence , femur , fissure , anatomy , surgery , geology , geomorphology , paleontology , structural basin
Objective 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. Study Design In vitro , mechanical study. Sample Population Femora (n=9) from 9 dogs. Methods 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. Results 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). Conclusions 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.