# Randomized comparison of oblique and perpendicular stabilizers for minimally invasive repair of pectus excavatum

## TL;DR

This study compares two types of stabilizers used in minimally invasive surgery for pectus excavatum to see if one reduces bar displacement and improves outcomes.

## Contribution

The study introduces a randomized clinical trial comparing oblique and perpendicular stabilizers for pectus excavatum repair.

## Key findings

- No significant difference in bar displacement between oblique and perpendicular stabilizers.
- Both groups showed improved body image and psycho-social scores post-surgery.
- The intervention group had a greater improvement in perception of physical difficulties.

## Abstract

Bar dislocation is one of the most feared complications of the minimally invasive repair of pectus excavatum.

Prospective randomized parallel-group clinical trial intending to assess whether oblique stabilizers can reduce bar displacement in comparison with regular stabilizers used in minimally invasive repair of pectus excavatum. Additionally, we evaluated pain, quality of life and other postoperative complications. Participants were randomly assigned to surgery with perpendicular (n = 16) or oblique stabilizers (n = 14) between October 2017 and September 2018 and followed for 3 years. Bar displacements were evaluated with the bar displacement index. Pain scores were evaluated through visual analogue scale and quality of life through the Pectus Excavatum Evaluation Questionnaire.

Control group average displacement index was 17.7 (±26.7) and intervention group average displacement index was 8.2 (±10.9). There was 1 reoperation in each group that required correction with 2 bars. Bar displacement was similar among groups (P = 0.12). No other complications were recorded. There was no statistically significant difference on pain score. There was a significant difference between pre- and postoperative composite scores of the participants’ body image domain and psycho-social aspects in both groups. The difference between the pre- and postoperative participants’ perception of physical difficulties was greater and statistically significant in the intervention group.

There was no statistical difference in the use of perpendicular or oblique stabilizers, but the availability of different models of stabilizers during the study suggested that this can be advantageous. The trial is registered at ClinicalTrials.gov, number NCT03087734.

Pectus excavatum (PE) is associated with shortness of breath, exercise intolerance, low self-esteem and depression [1–3] and to date there is no effective non-invasive treatment [4].