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Related Experiment Video

Updated: Jan 19, 2026

Automatic Laser-based Geometry Capture for Finite Element Analysis of Weld Beads
07:58

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Published on: July 25, 2025

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Modular hemipelvic endoprosthesis with a sacral hook: a finite element study.

Bo Wang1, Peidong Sun2, Hao Yao1

  • 1Department of Musculoskeletal Oncology, The First Affiliated Hospital of Sun Yat-Sen University, 58#, Zhongshan Road II, Guangzhou, 510080, Guangdong, China.

Journal of Orthopaedic Surgery and Research
|September 13, 2019
PubMed
Summary
This summary is machine-generated.

A novel hemipelvic endoprosthesis with a sacral hook enhances stability and reduces stress, improving outcomes. This design is biomechanically sound for hemipelvic reconstruction, decreasing complications like aseptic loosening.

Keywords:
BiomechanicsFinite element analysisHemipelvic prosthesisPelvic tumorSacral hook

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Area of Science:

  • Orthopedic biomechanics
  • Biomaterials engineering
  • Surgical reconstruction

Background:

  • A novel hemipelvic endoprosthesis featuring a sacral hook was previously introduced.
  • Midterm clinical follow-up indicated reduced prosthesis-related complications, particularly aseptic loosening.

Purpose of the Study:

  • To evaluate the biomechanical role of the sacral hook in hemipelvic endoprosthesis stability.
  • To assess the overall biomechanical properties of the endoprosthesis.

Main Methods:

  • A 3D model of the postoperative pelvis was created using CT scans.
  • Finite element analysis was performed under a 500 N load to evaluate stress and displacement.
  • Simulations compared prosthesis stability with and without the sacral hook and assessed the impact of pubic connection plate thickness.

Main Results:

  • Stress concentrations were observed at the acetabulum, sacral connection, and sacral hook.
  • The sacral hook reduced maximum stress by up to 14.1% and displacement by up to 32.5%.
  • Increasing pubic connection plate thickness reduced maximum stress by up to 32.0%.

Conclusions:

  • The hemipelvic endoprosthesis with a sacral hook meets biomechanical demands and is safe.
  • The sacral hook is crucial for maintaining prosthesis stability.
  • Thicker pubic connection plates mitigate stress and reduce fatigue breakage risk.