Assessment of construct validity of a virtual reality laparoscopy simulator

Area of Science:

• Surgical Education
• Medical Simulation
• Human Factors Engineering

Background:

• Assessing psychomotor and spatial skills is crucial in laparoscopic surgery training.
• Virtual reality (VR) simulators offer a potential tool for objective skill evaluation.
• Differentiating trainee skill levels is essential for effective surgical education.

Purpose of the Study:

• To evaluate the construct validity of a VR simulator in discriminating between novice and intermediate laparoscopic surgical trainees.
• To determine if VR simulator performance correlates with expert evaluations.
• To establish VR as a reliable tool for assessing surgical competency.

Main Methods:

• 307 participants performed a standardized clip-and-cut task on the Xitact LS 500 VR simulator.
• Participants were categorized into basic (BC) and intermediate (IC) courses based on experience.
• Objective VR performance metrics were compared with instructor assessments from pelvitrainer and conventional surgery exercises.

Main Results:

• Intermediate-level trainees (IC) significantly outperformed basic-level trainees (BC) on VR task completion time and right instrument economy of movement.
• Higher scores in pelvitrainer tasks correlated with faster VR trial completion times.
• Conventional surgery performance also showed significant differences in task completion time and right instrument economy of movement based on prior performance.

Conclusions:

• VR simulation offers a valid method for assessing psychomotor and spatial skills in laparoscopic surgery.
• The Xitact LS 500 VR simulator demonstrates construct validity by differentiating between trainees of varying experience levels.
• VR simulation holds potential as a gold standard for evaluating and monitoring surgical skills in laparoscopy.