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Articular surface remodeling of the hip after periacetabular osteotomy

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International Journal of Computer Assisted Radiology and Surgery Aims and scope Submit manuscript

Abstract

Purpose

Periacetabular osteotomies are a family of surgical procedures used to treat hip dysplasia. In a periacetabular osteotomy, the operating surgeon aims to increase acetabular coverage of the femoral head. The surgical correction has mechanical goals of increasing the stability of the joint and to improving the pressure distribution across the acetabulum. Although it is known that bone will remodel under changing load at the microstructural level, it is unclear whether there is any gross remodeling of the acetabulum or the femoral head in response to the change in loading following a periacetabular osteotomy. This observational study aims to quantify the shape of operative and contralateral hip joint surfaces pre and postoperatively to determine whether there are gross morphological changes in the shape of any of the bony articular surfaces of the joint.

Methods

Preoperative and postoperative computed tomography (CT) scans were segmented as triangulated meshes. The bony articular surfaces of these meshes were then isolated. The vertices of these surfaces were fit to spheres and to general ellipsoids and, in the case of the acetabulum, examined in anatomical coordinate frames to look for changes between pre and postoperative segmentations.

Results

Spherical fit results were consistent preoperatively and postoperatively, with small changes in the radii of the spheres of best fit for both operative and nonoperative hips. Ellipsoid fitting showed variations between preoperative and postoperative scans in both eccentricity and orientation.

Conclusions

Because there is no clear evidence of gross articular surface remodeling, periacetabular osteotomy for an adult should be planned with the expectation that the patient’s existing articular structure will be preserved.

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Authors and Affiliations

  1. Department of Mechanical and Materials Engineering, Queen’s University, Kingston, ON, Canada

    Brian J. Rasquinha & Randy E. Ellis

  2. Human Mobility Research Centre, Kingston General Hospital, Kingston, ON, Canada

    Brian J. Rasquinha, John F. Rudan, Gavin C. A. Wood & Randy E. Ellis

  3. Imperial College London, London, UK

    Junaid Sayani

  4. Department of Surgery, Kingston General Hospital, Kingston, ON, Canada

    John F. Rudan, Gavin C. A. Wood & Randy E. Ellis

  5. School of Computing, Queen’s University, Kingston, ON, Canada

    Randy E. Ellis

Authors
  1. Brian J. Rasquinha
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  2. Junaid Sayani
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  3. John F. Rudan
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  4. Gavin C. A. Wood
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  5. Randy E. Ellis
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Correspondence to Brian J. Rasquinha.

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Rasquinha, B.J., Sayani, J., Rudan, J.F. et al. Articular surface remodeling of the hip after periacetabular osteotomy. Int J CARS 7, 241–248 (2012). https://doi.org/10.1007/s11548-011-0641-x

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  • DOI: https://doi.org/10.1007/s11548-011-0641-x

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