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Femoral stem insertion generates high bone cement pressurization.

D L Churchill1, S J Incavo, J A Uroskie

  • 1McClure Musculoskeletal Research Center, Department of Orthopaedics and Rehabilitation, University of Vermont, Burlington 05405-0084, USA.

Clinical Orthopaedics and Related Research
|January 5, 2002
PubMed
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Inserting the femoral stem into highly viscous bone cement during hip replacement surgery significantly increases pressurization. Tapered stems also enhance this effect, potentially improving cement mantle quality.

Area of Science:

  • Orthopedic Surgery
  • Biomaterials Engineering
  • Biomechanical Engineering

Background:

  • Optimal femoral cement mantle formation is crucial for total hip arthroplasty (THA) success.
  • Bone cement pressurization during femoral stem insertion can augment conventional methods.
  • Understanding factors influencing insertion-induced pressurization is key for improved THA outcomes.

Purpose of the Study:

  • To evaluate the impact of bone cement viscosity and femoral stem profile on intramedullary pressurization during THA.
  • To quantify the relationship between cement cure state, stem geometry, and pressure generation.
  • To assess the potential of stem insertion technique to enhance cement pressurization.

Main Methods:

  • A reusable, simulated femoral canal was used to test pressurization during stem insertion.

Related Experiment Videos

  • Intramedullary pressures were monitored at four medial midline locations.
  • An 'intrusion factor' was developed to quantify pressurization, considering pressure, duration, and cement viscosity.

    • Main Results:

    • Inserting stems into late-stage (high viscosity) cement yielded significantly higher pressures (up to 187%) and intrusion factors (up to 43%) compared to early-stage (low viscosity) cement.
    • Pressures and intrusion factors were highest in the distal femoral canal.
    • Tapered stem profiles generated significantly higher pressures (up to 65%) and intrusion factors (up to 63%) than straight stems.

    Conclusions:

    • Bone cement viscosity at the time of stem insertion critically influences intramedullary pressurization.
    • Femoral stem taper significantly enhances insertion-induced pressurization.
    • These findings suggest that optimizing stem insertion technique and cement viscosity can improve femoral cement mantle quality in THA.