Meniscal abnormalities in the asymptomatic population at MR imaging

Area of Science:

• Orthopedics
• Radiology
• Biomedical Engineering

Background:

• Meniscal abnormalities are common in the general population.
• Understanding the prevalence and progression of meniscal signal changes in asymptomatic individuals is crucial for accurate diagnosis and treatment.
• Age-related changes in the meniscus are a significant area of research.

Purpose of the Study:

• To investigate the prevalence and characteristics of meniscal abnormalities in asymptomatic volunteers across different age groups.
• To determine the correlation between meniscal signal abnormalities and age, sex, and weight.
• To identify specific meniscal locations with a higher prevalence of abnormalities.

Main Methods:

• Analysis of 280 meniscal horns from 64 asymptomatic volunteers across the 2nd to 8th decades of life.
• Assessment of meniscal abnormalities using MRI, categorizing changes into Grade 1, 2, and 3.
• Statistical analysis to correlate abnormality prevalence with age, sex, and weight.

Main Results:

• Meniscal abnormalities (Grade 1, 2, and 3) were present in all age decades, with at least 25% prevalence of signal abnormalities by the 2nd decade.
• The prevalence and severity of meniscal abnormalities increased significantly with age, with Grade 2 changes showing the highest correlation (r=+.88).
• The posterior horn of the medial meniscus exhibited a significantly higher prevalence of abnormalities (P < .02) compared to other locations. No significant correlation was found with weight or sex.

Conclusions:

• A baseline prevalence of meniscal signal abnormalities exists in the asymptomatic population.
• Meniscal abnormalities are a common finding that increases with age and is not significantly influenced by weight or sex.
• The posterior horn of the medial meniscus is a common site for age-related meniscal changes.