International Orthopaedics

, Volume 43, Issue 6, pp 1329–1336 | Cite as

Inversion of the acetabular labrum causes increased localized contact pressure on the femoral head: a biomechanical study

  • Xipeng Wang
  • Kiyokazu FukuiEmail author
  • Ayumi Kaneuji
  • Kenichi Hirosaki
  • Hiroyasu Miyakawa
  • Norio Kawahara
Original Paper



Although studies suggest that subchondral insufficiency fracture of the femoral head may cause rapidly progressive osteoarthritis of the hip, the mechanism of that relationship remains unclear. Our biomechanical study aimed to provide more data in this area by quantifying pressure distribution on the femoral head for normal and inverted hips and by determining the effects of labral inversion on pressure distribution across the joint, focusing on types of fracture under load.


We tested mid-sized fourth-generation composite femurs at 15° of adduction, and applied 1 mm/min of axial compressive force to the femoral heads until failure. Additionally, single loads (3000 N) were applied using Prescale film to investigate pressure distribution on the femoral head, with or without silicone rubber representing entrapment of an inverted acetabular labrum.


In tests with an external load of 3000 N, the mean pressure for 10 × 5 mm of silicone rubber was 11.09 MPa, significantly greater (about 5.7-fold) than 1.94 MPa without silicone rubber. Different fracture patterns were observed with and without the 10 × 5 mm silicone rubber; when the 10 × 5 mm silicone rubber specimens were used, all eight cases showed fractures in the anterior femoral head.


When silicone rubber representing an inverted acetabular labrum was placed between a hemispherical metallic platen and a composite bone model, the silicone rubber areas were subjected to extreme concentration of stress. The fractures that developed at the silicone rubber areas clearly represented subchondral fractures of the femoral head, rather than fractures of the femoral neck.


Inverted acetabular labrum Subchondral fracture of the femoral head Rapidly progressive osteoarthritis of the hip Contact pressure Biomechanical study 



We thank Lee Seaman of Seaman Medical, Inc. (Bellingham, WA, USA) for providing the professional English-language editing of this article.


This research did not receive any specific grants from funding agencies in the public, commercial, or not-for-profit sectors.

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

Ethical approval

This article does not contain any studies with human participants or animals performed by any of the authors.


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Copyright information

© SICOT aisbl 2018

Authors and Affiliations

  • Xipeng Wang
    • 1
  • Kiyokazu Fukui
    • 2
    Email author
  • Ayumi Kaneuji
    • 2
  • Kenichi Hirosaki
    • 3
  • Hiroyasu Miyakawa
    • 3
  • Norio Kawahara
    • 2
  1. 1.Department of Orthopedic Surgery, Liyuan Hospital, Tongji Medical CollegeHuazhong University of Science and TechnologyWuhan, HubeiChina
  2. 2.Department of Orthopedic SurgeryKanazawa Medical UniversityKahoku-gun, IshikawaJapan
  3. 3.Department of Machinery and MetalIndustrial Research Institute of IshikawaKanazawa, IshikawaJapan

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