Ovine Ear Model for Fully Endoscopic Stapedectomy Training

Endoscopic surgery of the middle ear is progressively gaining the interest of otologists, as technological advances have overcome some of its main drawbacks. The long learning curve required to master this technique, urges the search for models to practice it. After the validation of sheep's ear as a proper training model for microscopic stapedectomy, our objective is to demonstrate its adequacy for practicing stapes surgery but performed through a fully endoscopic approach. Endoscopic stapedectomy was performed by two surgeons in 40 sheep ears (20 specimens each). To analyze the effects of the learning curve on surgical success, complication rates and surgical time reduction, the sample was divided in two groups: group 1 being the first ten procedures of each surgeon, and group 2 the second set of stapedectomies. The impact of the operated side and the resection of the chordal spine were also studied. No statistically significant differences were found considering the operated side. A statistically significant improvement in some of the surgical steps was demonstrated comparing both groups and also after the resection of the chordal spine. Mean surgical time declined from 38 to 31.5 min (p < 0.05). Using this model for endoscopic stapedectomy, a learning curve was objectively demonstrated, along with other subjective appreciations such as improvement in depth perception and one-hand instrument handling. We believe that sheep ear is an optimal model for endoscopic middle ear surgery, as it allows for the acquisition of the skills required to master this technique.