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Histological evaluation of the acetabular labrum after bipolar hip hemiarthroplasty: a case report

  • Nobuhiro KakuEmail author
  • Tatsuo Shimada
  • Ryutaro Nogami
  • Hiroaki Tagomori
  • Hiroshi Tsumura
Case Report

Abstract

We report herein the microstructure of the acetabular labrum obtained from a patient with stem loosening but without bipolar cup migration who had undergone hemiarthroplasty for femoral neck fracture 18 years ago. We used light and scanning electron microscopy to investigate the influence of bipolar cup on acetabular labrum in vivo. Deparaffinized blocks were treated with 2 N NaOH to digest the cell matrix, allowing the collagen fibers, constituting the acetabular labrum, to be observed under scanning electron microscopy. Although chondrocyte atrophy was seen, the basic structure was not different from the normal tissue images of the elderly. However, in the deep part of the acetabular labrum, there was an area that was not stained with Alcian blue observed with light microscopy, and there was an amorphous tissue without type II collagen fibrils observed with scanning electron microscopy. These findings proved that the acetabular labrum has partially degenerated over the long term after bipolar hemiarthroplasty, and that the acetabular labrum can survive in vivo in such a condition. Given that hemiarthroplasty has a possibility to preserve the face-to-face tissue in the long term in vivo, it may be one of the valuable options for modern or future joint reconstruction surgery.

Keywords

Bipolar hemiarthroplasty Acetabular labrum Microstructure Scanning electron microscopy Chondrocyte Collagen fibrils Collagen fibers 

Notes

Acknowledgements

We would like to thank Editage (www.editage.com) for English language editing.

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflicts of interest.

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Copyright information

© The Japanese Society for Clinical Molecular Morphology 2020

Authors and Affiliations

  • Nobuhiro Kaku
    • 1
    Email author
  • Tatsuo Shimada
    • 2
  • Ryutaro Nogami
    • 3
  • Hiroaki Tagomori
    • 1
  • Hiroshi Tsumura
    • 1
  1. 1.Department of Orthopaedic Surgery, Faculty of MedicineOita UniversityYufu CityJapan
  2. 2.Oita College of Judo Therapy and Acupuncture-MoxibustionOita CityJapan
  3. 3.Oita University Graduate School of Medicine Graduate School of Orthopedic SurgeryYufu CityJapan

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