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Related Concept Videos

Errors in Taping01:18

Errors in Taping

449
Errors in taping arise from multiple factors that can significantly impact measurement accuracy in surveying. Misalignment of the tape, often due to human error, is one primary source. A skilled rear tapeman, using a telescope, can help correct alignment by guiding the head tapeman; however, human limitations still lead to small inaccuracies. These errors may include misplacement of pins or inaccurate tape readings due to common visual confusions, such as mistaking a six for a nine. Such...
449

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Related Experiment Video

Updated: Apr 2, 2026

Three-Dimensional Preoperative Virtual Planning in Derotational Proximal Femoral Osteotomy
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Quantifying Multiplanar Alignment Errors From Patient-Specific Guide Malpositioning in Medial Opening Wedge High

Christopher J Davey1, Takaaki Hiranaka1,2, David Parker1

  • 1Sydney Orthopaedic Research Institute, Sydney, New South Wales, Australia.

Journal of Orthopaedic Research : Official Publication of the Orthopaedic Research Society
|April 1, 2026
PubMed
Summary

Patient-specific guides in high tibial osteotomy are sensitive to malpositioning. Rotational errors significantly impact tibial torsion, while vertical and horizontal displacements affect coronal and sagittal alignment within defined limits.

Keywords:
high tibial osteotomymedial opening wedgepatient‐specific instrumentationsurgical guide malpositioningvirtual surgical simulation

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Area of Science:

  • Orthopedic surgery
  • Biomechanical engineering
  • Medical imaging

Background:

  • Patient-specific cutting guides (PSCGs) enhance alignment in high tibial osteotomy (HTO).
  • The sensitivity of PSCGs to intraoperative malpositioning requires quantification for improved accuracy.

Purpose of the Study:

  • To investigate the impact of translational and rotational malpositioning of PSCGs on postoperative multiplanar alignment in medial opening wedge HTO using virtual simulation.

Main Methods:

  • Virtual osteotomy on 20 tibial models from CT scans.
  • Systematic malpositioning of PSCGs (vertical, rotational, horizontal).
  • Analysis of postoperative medial proximal tibial angle, posterior proximal tibial angle, and tibial torsion against ideal alignment (within 1° error).

Main Results:

  • Vertical malpositioning primarily affects coronal alignment; >8mm distal displacement causes overcorrection.
  • Rotational malpositioning impacts all parameters, especially tibial torsion (acceptable range: -10° to +8°).
  • Horizontal malpositioning variably affects posterior tibial angle (acceptable range: -4mm to +3mm), with minimal effect on tibial torsion.

Conclusions:

  • Defines clinically acceptable PSCG malpositioning ranges for medial opening wedge HTO.
  • Identifies displacement modes most affecting coronal, sagittal, and axial alignment.
  • Provides thresholds for PSCG design and intraoperative placement to minimize alignment errors.