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The cartilage degeneration and joint motion of bipolar hemiarthroplasty

Yee-Suk Kim1, Young-Ho Kim, Kyu-Tae Hwang

  • 1Department of Orthopaedic Surgery, Hanyang University Hospital, 17 Haengdang-dong, Seongdong-gu, Seoul, South Korea.

International Orthopaedics
|May 17, 2012
PubMed

Insights

Bipolar hemiarthroplasty for femoral head osteonecrosis shows disappointing outcomes. High cartilage degeneration and declining joint motion predict osteolysis, requiring close patient monitoring.

Area of Science:

  • Orthopedic surgery
  • Biomaterials science

Background:

  • Bipolar hemiarthroplasty is used for osteonecrosis of the femoral head.
  • Outcomes are often poor due to cartilage degeneration and osteolysis.

Purpose of the Study:

  • Investigate cartilage degeneration in bipolar hemiarthroplasty.
  • Analyze joint motion and factors linked to osteolysis.

Main Methods:

  • Retrospective review of 134 bipolar hemiarthroplasties.
  • Calculation of acetabular cartilage wear rate.
  • Determination of outer and inner bearing motion ranges and their ratio.

Main Results:

  • Mean acetabular cartilage degeneration rate was 0.34 ± 0.35 mm/year.
  • Outer bearing motion was dominant but decreased over time.
  • Osteolysis group showed significantly higher cartilage degeneration and outer bearing motion decline.

Conclusions:

  • Close monitoring is essential for patients with high cartilage degeneration rates.
  • Rapid decline in outer bearing motion indicates a risk of osteolysis.
Abstract

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