Related Experiment Video
Updated: Aug 20, 2025
06:42
Extracting the Cochlea from a Human Temporal Bone: A Cadaveric Protocol
Published on: August 18, 2023
987
Comparison of Summative Temporal Bone Dissection Scales Demonstrate Equivalence
Jordan B Hochman1, Justyn Pisa2, Shubhi Singh2
1Division of Neurotologic Surgery, Department of Otolaryngology Head and Neck Surgery, Faculty of Health Sciences, University of Manitoba, Manitoba, Canada.
International Archives of Otorhinolaryngology
|November 21, 2022
Summary
Three temporal bone dissection scales effectively differentiate resident skill levels in surgery. The CanadaWest Scale and Welling Scale showed better intrarater reliability than the Iowa Temporal Bone Assessment Tool.
Area of Science:
- Otolaryngology
- Surgical Education
- Medical Simulation
Background:
- Temporal bone surgery demands specialized skills and extensive training.
- Effective feedback and maximized trainee experience are crucial for surgical education.
- Objective assessment tools are needed to evaluate resident proficiency in temporal bone dissection.
Purpose of the Study:
- To evaluate the efficacy, reliability, and accuracy of three temporal bone dissection scales.
- To compare the Welling Scale (WS), Iowa Temporal Bone Assessment Tool (ITBAT), and CanadaWest Scale (CWS) in assessing resident surgical skill.
- To determine which scale best differentiates skill levels and offers consistent evaluation.
Main Methods:
- Residents of varying postgraduate year (PGY) levels performed a mastoidectomy with posterior tympanotomy on 3D-printed temporal bone models.
- Four blinded otologic surgeons assessed the specimens using the WS, ITBAT, and CWS at two separate intervals.
- Scales were compared for accuracy in separating skill levels, inter- and intrarater reliability, and scoring efficiency.
Main Results:
- All three scales demonstrated significant differences in performance across junior, intermediate, and senior resident cohorts (p < 0.05).
- Inter-rater reliability was consistent across all scales.
- The CanadaWest Scale (CWS) and Welling Scale (WS) exhibited comparable intrarater reliability (0.711 and 0.713, respectively), outperforming the Iowa Temporal Bone Assessment Tool (ITBAT) (0.289).
- Scoring efficiency varied, with CWS being the fastest (42.7s), followed by WS (76.6s), and ITBAT (105.6s).
Conclusions:
- All evaluated scales possess construct validity and consistency for assessing temporal bone dissection skills.
- The CanadaWest Scale and Welling Scale demonstrate superior intrarater reliability for resident skill assessment.
- Judicious selection and application of these scales can enhance temporal bone surgical training programs.
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