Get access

Resistance to Subsidence of an Uncemented Femoral Stem After Cerclage Wiring of a Fissure

Authors

  • Ryan S. McCulloch MS,

    1. Department of Biomedical Engineering, North Carolina State University/University of North Carolina at Chapel Hill, Raleigh/Chapel Hill, NC
    Search for more papers by this author
  • Simon C. Roe BVSc, PhD,

    Corresponding author
    1. College of Veterinary Medicine, North Carolina State University, Raleigh, NC
    • Corresponding Author

      Dr. Simon C. Roe, BVSc, PhD, NCSU-CVM, Department of Clinical Sciences, 1052 William Moore Dr, Raleigh, NC 27607

      E-mail: simon_roe@ncsu.edu

    Search for more papers by this author
  • Denis J. Marcellin-Little DEDV,

    1. College of Veterinary Medicine, North Carolina State University, Raleigh, NC
    Search for more papers by this author
  • Peter L. Mente PhD

    1. Department of Biomedical Engineering, North Carolina State University/University of North Carolina at Chapel Hill, Raleigh/Chapel Hill, NC
    Search for more papers by this author

Abstract

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.

Get access to the full text of this article

Ancillary