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Related Experiment Video

Updated: May 9, 2026

The Transition to an Anterior-Based Muscle Sparing Approach Improves Early Postoperative Function but is Associated with a Learning Curve
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The Transition to an Anterior-Based Muscle Sparing Approach Improves Early Postoperative Function but is Associated with a Learning Curve

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Peri-acetabular bone mineral densityin total hip replacement.

L Gauthier1, L Dinh, P E Beaulé

  • 1Ottawa Hospital, Divisionof Orthopaedic Surgery, University of Ottawa, 501Smyth Road Suite 5004, Ottawa, Ontario, K1H8L6, Canada.

Bone & Joint Research
|August 6, 2013
PubMed
Summary

Metal-on-metal (MoM) and metal-on-polyethylene (MoP) hip implants showed similar bone mineral density around the acetabulum. MoM implants were associated with higher activity scores but also one revision for loosening.

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The femur is the body's longest and strongest bone spanning the thigh region. Its head articulates with the acetabulum of the hip bone to form the hip joint. A minor indentation on the medial side of the femoral head, called the fovea capitis, serves as the site of attachment for the ligament of the head of the femur. This weak ligament spans the femur and acetabulum and supports the hip joint. The narrowed region below the head is the neck of the femur. The inclination angle between the neck...

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Area of Science:

  • Orthopedic surgery
  • Biomaterials science
  • Radiology

Background:

  • Total hip replacement (THR) utilizes acetabular components with varying bearing surfaces.
  • Metal-on-metal (MoM) and metal-on-polyethylene (MoP) are common bearing types with distinct material properties.
  • Peri-acetabular bone mineral density (BMD) changes can indicate implant stability and bone integration.

Purpose of the Study:

  • To compare peri-acetabular bone mineral density (BMD) between MoM and MoP acetabular components.
  • To evaluate patient-reported functional outcomes following implantation of MoM versus MoP components.
  • To assess the long-term effects on bone integration and implant survivorship.

Main Methods:

  • Randomized controlled trial with 50 patients (25 per group: MoM vs. MoP).
Keywords:
BMDHipPeri-acetabular BMDTHRTitanium

Related Experiment Videos

Last Updated: May 9, 2026

The Transition to an Anterior-Based Muscle Sparing Approach Improves Early Postoperative Function but is Associated with a Learning Curve
09:51

The Transition to an Anterior-Based Muscle Sparing Approach Improves Early Postoperative Function but is Associated with a Learning Curve

Published on: September 7, 2022

  • BMD measurements of the acetabulum and contralateral hip at baseline, one, and two years.
  • Assessment of clinical function using WOMAC, UCLA, Harris hip score, and RAND-36.

    • Main Results:

    • No significant differences in peri-acetabular BMD between MoM and MoP groups when controlling for systemic BMD.
    • The MoM group showed a significant loss in BMD in zone 1 (-2.5%) compared to a gain in the MoP group (+2.2%).
    • Higher UCLA activity scores and RAND-36 physical function scores were observed in the MoM group at two years. One MoM revision for aseptic loosening occurred.

    Conclusions:

    • Peri-acetabular BMD is comparable between MoM and MoP acetabular components after two years, adjusting for systemic factors.
    • While MoM implants showed higher patient activity levels, concerns over adverse tissue reactions have limited their use.
    • The study highlights the importance of considering both bone integration and potential adverse effects when selecting acetabular components.