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Human error in strabismus surgery: quantification with a sensitivity analysis.

Sander Schutte1, Jan Roelof Polling, Frans C T van der Helm

  • 1Department of BioMechanical Engineering, Faculty of Mechanical, Maritime and Materials Engineering, Delft University of Technology, Delft, The Netherlands. mail@schutte.ws

Graefe'S Archive for Clinical and Experimental Ophthalmology = Albrecht Von Graefes Archiv Fur Klinische Und Experimentelle Ophthalmologie
|October 28, 2008
PubMed
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Human error in strabismus surgery, including measurement inaccuracy, strategy variability, and imprecise surgical techniques, contributes significantly to reoperations. Quantifying these factors is key to improving surgical outcomes.

Area of Science:

  • Ophthalmology
  • Surgical Outcomes
  • Biomechanical Modeling

Background:

  • Reoperations are common in strabismus surgery, necessitating analysis of human-error related factors.
  • Variability in strabismus surgery outcomes requires systematic investigation of contributing factors.

Purpose of the Study:

  • To systematically analyze human-error related factors influencing strabismus surgery outcomes.
  • To quantify the variability introduced by measurement, surgical strategy, and surgical accuracy.

Main Methods:

  • Quantified variation in strabismus angle measurement, surgical strategy, and surgical accuracy.
  • Assessed prism cover test accuracy with six orthoptists and analyzed surgical photographs.
  • Used a mechanical model and sensitivity analysis to relate human error to inter-patient differences.

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Main Results:

  • Measurement variation (latent angle) contributed 20% to total variance (90% CI of 5 degrees).
  • Surgical strategy variation accounted for 15% of total variance (bilateral recessions varied significantly).
  • Surgical accuracy variation contributed 20% of total variance (estimated at +/-0.5 mm).

Conclusions:

  • Human error in strabismus surgery can be quantified using sensitivity analysis.
  • Inaccuracy in angle measurement, surgical strategy, and surgical precision contribute to approximately 50% of strabismus reoperations.