Evaluation of the Symmetry of the Levator Veli Palatini Muscle and Velopharyngeal Closure Among a Noncleft Adult Population

Growth and Symmetry of the Levator Veli Palatini Muscle Within the First Two Years of Life

OBJECTIVE

To quantify differences in levator veli palatini (LVP) muscle dimensions based on age, sex, and race and determine the typical range of asymmetry between the left and right sides of the LVP under age 2.

DESIGN

Retrospective cohort study.

SETTING

Children's tertiary care hospital.

PARTICIPANTS

A retrospective chart review of non-cleft patients under 2 who received a volumetric FLAIR MRI sequence within the past 18 months identified 216 patient scans. Exclusion criteria left 200 scans for analysis. Measurements of the LVP were obtained consistent with previous literature.

INTERVENTIONS

Corrected age, sex, and race.

MAIN OUTCOME MEASURE(S)

LVP muscle dimensions.

RESULTS

A significant (P < .0001) difference between corrected age groups based on the overall combination of LVP variables after controlling for sex and race. Significant age differences included average extravelar length (P < .0001), average intravelar length (P < .0001), midline thickness (P < .0001), and average (P < .0001) and difference (P = .0413) in insertion thickness. Significant sex differences included average intravelar length (P = .0412) and average insertion thickness (P = .0281). Significant race differences included average insertion thickness (P = .0334) and difference in intravelar length (P = .0473). Differences between left and right total length (P = .0491) and angle of origin (P < .0001) were significant.

CONCLUSIONS

Differences in LVP morphology were observed in individuals under 2 years or age related to age, sex, and race. While asymmetry was significant in some dimensions, it varied by age range.

Simulation of Velopharyngeal Biomechanics Identifies Differences in Sphincter Pharyngoplasty Outcomes: A Matched Case-Control Study

The purpose of this study was to develop a framework for 3D subject-specific computational models capable of simulating velopharyngeal biomechanics for anatomic changes that occur following pharyngoplasty and to gain insight into biomechanical factors that may lead to different speech/surgical outcomes. Patient-specific models for two, matched participants with differing speech/surgical outcomes were developed: one with a successful pharyngoplasty outcome and one with a failed pharyngoplasty outcome. Surgical scenarios were simulated to model pharyngoplasty location, identify LVP muscle biomechanics, and identify an optimal pharyngoplasty location for each participant. These simulations illustrate the potential for optimizing pharyngoplasties based on patient-specific geometry.