title: The validation of an instrumented simulator for the assessment of performance and outcome of knot tying skill: a pilot study.
abstract: The construct validity of a surgical bench-top simulator with built-in computer acquired assessments was examined. It features two parallel elastic tubes instrumented with flexion sensors that simulate the walls of a wound. Participants from three groups (9 novices, 7 intermediates, 9 experts) performed 10 two-handed, double square knots. The peak tensions at the initiation of the first knot, the completion of the first knot and the completion of the second knot, as well as measures of movement economy indicated technical performance. Product quality was indicated by knot stability defined as the amount of slippage of the knot under the tension. There were significant differences between experts and novices for peak tension on first knot (p=.03), movement economy (p=.02), and knot stability (p=.002). The results support the construct validity of these objective measures.
authors.affiliation: Faculty of Electronics Engineering, Pontificia Bolivariana University, Bucaramanga, Colombia.
authors.forename: David
authors.initials: D
authors.lastname: Rojas
authors.forename: Sayra
authors.initials: S
authors.lastname: Cristancho
authors.forename: Claudia
authors.initials: C
authors.lastname: Rueda
authors.forename: Lawrence
authors.initials: L
authors.lastname: Grierson
authors.forename: Alex
authors.initials: A
authors.lastname: Monclou
authors.forename: Adam
authors.initials: A
authors.lastname: Dubrowski
mesh_terms: D003198:Computer Simulation; D003194:Computer-Assisted Instruction / Q000295:instrumentation*; D004867:Equipment Design; D019544:Equipment Failure Analysis; D006801:Humans; D008954:Models, Biological; D010865:Pilot Projects; D025321:Surgery, Computer-Assisted / Q000295:instrumentation*; D013536:Suture Techniques; D013537:Sutures; D013647:Task Performance and Analysis; D013663:Teaching / Q000379:methods; D014584:User-Computer Interface