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Three-Dimensional Preoperative Virtual Planning in Derotational Proximal Femoral Osteotomy
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Biomechanical Optimization-Based Planning of Periacetabular Osteotomy.

Li Liu1,2, Klaus Siebenrock3, Lutz-P Nolte4

  • 1National-Regional Key Technology Engineering Laboratory for Medical Ultrasound, Guangdong Key Laboratory for Biomedical Measurements and Ultrasound Imaging, School of Biomedical Engineering, Health Science Center, Shenzhen University, Shenzhen, China. li.liu@szu.edu.cn.

Advances in Experimental Medicine and Biology
|October 12, 2018
PubMed
Summary

Computerized planning for periacetabular osteotomy (PAO) can use patient-specific or constant thickness cartilage models. Both models showed good correlation in finite element analysis, suggesting constant thickness models may be viable for PAO planning.

Keywords:
Biomechanical simulationFinite element analysis (FEA)Hip dysplasiaImage-guided surgeryJoint preservation surgeryPeriacetabular osteotomy (PAO)Planning

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Area of Science:

  • Orthopedic surgery
  • Biomechanical engineering
  • Medical imaging analysis

Background:

  • Modern periacetabular osteotomy (PAO) planning utilizes morphology-based or biomechanics-based methods.
  • Biomechanics-based methods estimate joint contact pressures and areas using patient-specific or constant thickness cartilage models.

Purpose of the Study:

  • To investigate optimal acetabular reorientation in PAO using finite element analysis (FEA) based on simulated joint contact pressures and areas.
  • To compare biomechanical simulation results using patient-specific versus constant thickness cartilage models.

Main Methods:

  • FEA was performed on 10 hip dysplasia specimens using CT arthrography data.
  • Bone and patient-specific cartilage models were created and loaded to simulate joint conditions.
  • Acetabular inclination was adjusted to find optimal reorientation based on contact area and pressure.
  • The simulation was repeated using a constant thickness cartilage model for comparison.

Main Results:

  • Good correlation was found between patient-specific and constant thickness cartilage models for peak contact pressures (r=0.634) and contact areas (r=0.872).
  • The optimal acetabular position yielded the largest contact areas and lowest peak pressures for both cartilage models.
  • The optimal positions identified were consistent between the two cartilage modeling approaches.

Conclusions:

  • Patient-specific and constant thickness cartilage models demonstrate good correlation in FEA for PAO planning.
  • Computer-assisted planning with FE modeling using constant thickness cartilage models is a promising tool for PAO when conventional CT is available.