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    The threshold force required for femoral impaction grafting in revision hip surgery.

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    Authors
    Flannery, Olivia M
    Britton, John R
    O'Reilly, Peter
    Mahony, Nicholas
    Prendergast, Patrick J
    Kenny, Paddy J
    Affiliation
    Trinity Centre for Bioengineering, School of Engineering, Trinity College, Dublin, Ireland.
    Issue Date
    2010-06
    Keywords
    SURGERY
    Local subject classification
    ORTHOPAEDICS
    MeSH
    Adult
    Animals
    Arthroplasty, Replacement, Hip
    Bone Cements
    Bone Transplantation
    Femoral Fractures
    Hip Prosthesis
    Humans
    Prosthesis Failure
    Reoperation
    Swine
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    Citation
    The threshold force required for femoral impaction grafting in revision hip surgery. 2010, 81 (3):303-7 Acta Orthop
    Journal
    Acta orthopaedica
    URI
    http://hdl.handle.net/10147/108223
    DOI
    10.3109/17453674.2010.480936
    PubMed ID
    20367418
    Abstract
    BACKGROUND AND PURPOSE: Femoral impaction grafting requires vigorous impaction to obtain adequate stability without risk of fracture, but the force of impaction has not been determined. We determined this threshold force in a preliminary study using animal femurs. METHODS: Adult sow femurs were used because of their morphological similarity to human femurs in revision hip arthroplasty. 35 sow femurs were impacted with morselized bone chips and an increasing force was applied until the femur fractured. This allowed a threshold force to be established. 5 other femurs were impacted to this force and an Exeter stem was cemented into the neomedullary canal. A 28-mm Exeter head was attached and loaded by direct contact with a hydraulic testing machine. Axial cyclic loading was performed and the position sensor of the hydraulic testing machine measured the prosthetic head subsidence. RESULTS: 29 tests were completed successfully. The threshold force was found to be 4 kN. There was no statistically significant correlation between the load at fracture and the cortex-to-canal ratio or the bone mineral density. Following impaction with a maximum force of 4 kN, the average axial subsidence was 0.28 mm. INTERPRETATION: We achieved a stable construct without fracture. Further studies using human cadaveric femurs should be done to determine the threshold force required for femoral impaction grafting in revision hip surgery.
    Item Type
    Article
    Language
    en
    ISSN
    1745-3682
    ae974a485f413a2113503eed53cd6c53
    10.3109/17453674.2010.480936
    Scopus Count
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    Journal articles & published research

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