Is unilateral posterior crossbite associated with leg length inequality?

Area of Science:

• Orthodontics
• Pediatric Orthopedics
• Biomechanical Analysis

Background:

• Malocclusions, particularly unilateral posterior crossbite, are common in adolescents.
• Previous research suggests a potential link between malocclusions and whole-body posture, including leg length discrepancy.
• However, scientific evidence supporting this association remains limited.

Purpose of the Study:

• To investigate the potential association between leg length inequality (LLI) and unilateral posterior crossbite in young adolescents.
• To contribute empirical data to the ongoing discussion regarding the influence of malocclusions on skeletal and postural development.

Main Methods:

• A cross-sectional survey was conducted on 1,159 adolescents (mean age 12.3 years) from three schools.
• Participants underwent independent orthodontic and orthopedic examinations to assess malocclusion and leg length.
• Logistic regression analysis was employed to analyze the relationship between unilateral posterior crossbite and LLI, controlling for confounding variables.

Main Results:

• Leg length inequality (LLI) was diagnosed in 10.3% of the subjects.
• Unilateral posterior crossbite was identified in 12.2% of the participants.
• Logistic regression analysis did not reveal a statistically significant association between LLI and unilateral posterior crossbite (OR = 1.0, 95% CI: 0.6-1.9).

Conclusions:

• Unilateral posterior crossbite does not appear to be significantly associated with leg length inequality in the studied population of young adolescents.
• The findings suggest that other factors may be more influential in the development of leg length inequality.
• Further research with different methodologies or populations may be warranted to fully elucidate any potential complex relationships.