Cadaveric Dissection vs Homemade Model: What is the Best Way to Teach Endoscopic Totally Extraperitoneal Inguinal Hernia Repair?

BACKGROUND

Endoscopic totally extraperitoneal inguinal hernia repair (TEP-IHR) requires practice and training to perform well. We developed a simple, low-cost, inanimate model to teach surgical residents inguinal anatomy and the technique of mesh insertion for a safe, endoscopic TEP-IHR. The objective of this study was to compare our model vs cadaveric dissection for teaching anatomy and mesh insertion.

METHODS

A total of 14 general surgery residents participated in an institutional review board approved, prospective, and randomized study. Participants received a timed, web-based, interactive pretest assessing relevant anatomy and operative-based techniques. They then performed endoscopic TEP-IHRs on either a cadaver or our low-cost model. Participants then received a timed, web-based interactive posttest consisting of the same questions. Participants were surveyed anonymously regarding the degree to which either the model or the cadaver was educationally effective.

RESULTS

Both groups of trainees (cadaver = 7, low-cost model = 7) scored higher on the posttest (p<0.05) with similar improvement (cadaver group: pretest = 78% correct, posttest = 87%; low-cost model group: 77% vs 86%). Survey results revealed the trainees preferred for both initial learning and understanding of mesh placement using low-cost models (5 out of 5, 4.8/5, respectively) over cadavers (4.0/5, 3.8/5, respectively; p<0.05). Trainees preferred the cadaver (4.7) over the low-cost model (3.9, p<0.05) in overall experience. No differences were found in the trainees' preference between the cadaver (4.5) and low-cost model (4.7) in the overall educational value.

CONCLUSION

While the overall educational experience of 14 learners favored a cadaver experience to learn TEP-IHR, initial anatomical learning and placing the mesh was better with an inanimate model. Given the educational value of the 2 methods was equivalent, the $1500 cost for cadavers make the inexpensive and repeatable inanimate model an attractive early resource for learning TEP-IHR.