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Related Experiment Videos

A low stiffness composite biologically fixed prosthesis.

A H Glassman1, R D Crowninshield, R Schenck

  • 1The Anderson Orthopaedic Clinic, Arlington, VA, USA.

Clinical Orthopaedics and Related Research
|January 5, 2002
PubMed
Summary
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This study investigated a novel hip implant designed to reduce stress shielding and promote bone ingrowth after total hip replacement. Results show the implant achieved stable fixation and excellent bone mineral density retention, reducing proximal femoral bone loss.

Area of Science:

  • Orthopedic Surgery
  • Biomaterials Engineering
  • Bone Physiology

Background:

  • Total hip reconstruction aims for stable fixation and long-term implant survival.
  • Stress shielding, a consequence of rigid implants, can lead to proximal femoral bone loss.
  • Biologically-fixed femoral components require careful design to balance fixation and stress distribution.

Purpose of the Study:

  • To evaluate a novel, less rigid femoral component for total hip arthroplasty.
  • To assess if this design reduces stress-induced adaptive bone remodeling and proximal femoral bone loss.
  • To determine the long-term efficacy and safety of this new implant design.

Main Methods:

  • A cohort of 366 patients (386 hips) received the novel femoral component.

Related Experiment Videos

  • Follow-up averaged 2.4 years, with 268 patients having at least 2 years of data.
  • Radiostereometric analysis (RSA) and dual-energy X-ray absorptiometry (DXA) were used to assess fixation, micromotion, and bone mineral density.

    • Main Results:

    • No femoral implants failed to achieve bone ingrowth or required revision surgery.
    • Radiographic evaluation showed stable fixation with no progressive radiolucencies or osteolysis.
    • RSA confirmed stable initial fixation and minimal stem micromotion; DXA revealed excellent periprosthetic bone mineral density retention.
    • Compared to rigid metal stems, the novel design demonstrated reduced proximal femoral bone loss.

    Conclusions:

    • The novel femoral component effectively achieves stable skeletal fixation and structural durability.
    • This implant design successfully reduces femoral stress shielding and associated bone resorption.
    • The findings suggest this implant is a promising alternative for total hip reconstruction, preserving bone stock.