Smith LJ, Trout JM, Sridharan SS, Guyer JR, Owens GE, Chambers AJ, Rosen CA; Comparison of Microsuspension Laryngoscopy Positions: A Randomized, Prospective Study; The Laryngoscope, vol. 125(3), pp. 649-54, 2015.

Abstract

Objectives/Hypothesis

To evaluate muscle fatigue and participant pain in the upper back, cervical, and arm muscles associated with microlaryngeal surgery (MLS) in standardized favorable and unfavorable ergonomic positions.

Study Design

Individual randomized counterbalanced design.

Methods

Electromyographic sensors were placed on targeted muscles involved with performing MLS on 18 otolaryngology residents/fellows. Subjects were randomly counterbalanced in both favorable and unfavorable positions while completing simulated laryngeal microsurgical tasks. Participants reported their extent of muscle discomfort in targeted muscle regions on a standardized survey.

Results

Muscle fatigue and self-reported pain were reduced, and productivity was improved in the favorable position. In the lower trapezius, significantly less muscle activation (P = 0.025) and less pain (P < 0.05) were found while in the favorable position compared to the unfavorable position.

Conclusion

This is the first study to demonstrate electromyographic evidence of decreased muscle activation and fatigue, in addition to self-reported pain with a more favorable microsurgical ergonomic position, which may help surgeons avoid musculoskeletal injuries.