Design and validation of a model for assessment of procedural skills in open surgery

IntroductionLaparoscopy is currently the gold standard for cholecystectomy. Recent literature suggests surgical trainees have limited exposure to open cholecystectomy which may result in suboptimal performance in the event of conversion. Furthermore, most training and assessment models are designed for laparoscopic cholecystectomy with limited opportunities for open simulator training. The present study's purpose was to design an inexpensive model for open cholecystectomy and validate a performance assessment tool.MethodsThe simulator is comprised of a porcine liver and gallbladder in a mock human abdomen with silicon skin. The assessment tool utilizes inexpensive IR cameras to provide tracking of participant hand motions. Ten novice general surgery trainees (<20 cholecystectomies) and five expert surgeons (> 100 cholecystectomies) completed an open cholecystectomy using the simulator. Procedures were recorded and assessed by a blinded evaluator using a global rating scale. Tracking data analysis was based on number of movements and total path length.ResultsNovices (t=36.18 min) completed the procedure significantly slower than experts (t=19.53 min) (Mann-Whitney's test U=20, p<0.05) and had significantly more hand movements (Mann-Whitney's test U=20, p<0.05). Analysis of the total global rating scale scores showed a significant difference between novice (14/35) and expert (24/35) performance in all categories (Mann-Whitney's test U=58, p<0.05).ConclusionsThe present model presents a realistic, low-cost tool for training and assessment of procedural skills in open cholecystectomy. The study demonstrated the validity of the IR tracking device as an objective assessment tool for open surgical skills training. Future training should incorporate this low-cost, highly effective training device into surgical curricula.