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Periacetabular osteotomy using three-dimensional cutting and reposition guides: a cadaveric study.

Stephan H Wirth1, Stefan Rahm1, Atul F Kamath2

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Summary

Custom 3D guides assist periacetabular osteotomy (PAO) surgery by aiding acetabular reorientation. This pilot study shows these guides offer accurate positioning and acceptable corrections in cadavers with good bone quality.

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Area of Science:

  • Orthopedic surgery
  • Biomedical engineering
  • 3D printing applications

Background:

  • Periacetabular osteotomy (PAO) aims to reposition the acetabulum for improved hip joint function.
  • Achieving the desired acetabular orientation during PAO is technically challenging.
  • Custom surgical guides could enhance precision in PAO procedures.

Purpose of the Study:

  • To evaluate the feasibility and accuracy of custom 3D-printed cutting and reorientation guides for periacetabular osteotomy (PAO).
  • To assess the precision of acetabular reorientation using these guides in a cadaveric model.

Main Methods:

  • CT scans of eight cadaveric hemipelves were used to create 3D models.
  • Virtual PAO and acetabular reorientation were planned.
  • Custom 3D-printed guides were designed for specific bone cuts and reorientation.
  • PAO was performed on cadavers using the guides via a modified Smith-Peterson approach.
  • Post-operative CT scans were compared to the virtual plan for accuracy.

Main Results:

  • Six cadavers with adequate bone quality were analyzed; two were excluded due to poor fixation stability.
  • Mean deviations from the planned acetabular position were: 5° for acetabular index (AC), 6° for lateral centre edge angle (LCE), and 15° for acetabular anteversion (AcetAV).
  • The 3D guides demonstrated accurate bone fit and osteotomy positioning.

Conclusions:

  • 3D-printed cutting and reorientation guides are feasible for PAO using a modified Smith-Peterson approach.
  • These guides facilitate accurate osteotomies and acceptable acetabular reorientation in cadavers with good bone quality.
  • Custom guides show potential for improving precision in periacetabular osteotomy surgery.