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Clinical significance of meniscal abnormalities on magnetic resonance imaging in an older population
The Knee, 05/19/09

Fukuta S et al. – Study concludes that frequency of asymptomatic grade 3 meniscal abnormalities was relatively low even in older subjects if there was no evidence of radiographic osteoarthritic changes. Abnormal MR signals are more likely to have clinical significance, in patients with radiographic changes on plain X-ray.

Methods

Study was undertaken to:
- examines the prevalence of degenerative changes of knee menisci in aging and
- evaluate the diagnostic values of magnetic resonance (MR) imaging for assessing meniscal pathology in an older population
85 knees of asymptomatic volunteers >40 yrs were scanned using MR imaging
Meniscal abnormalities were graded from 0 to 3 according to intrameniscal MR signals
Subjects were divided into 2 groups based on the presence or absence of radiographic OA:
- Group I: 43 knees that had normal radiographs
- Group II: 42 knees that had radiographic evidence of OA

Results

Degenerative changes in the menisci involved primarily the posterior segment of the medial meniscus in both groups
Signal changes in the other segments were of a lesser grade than that in the posterior segment of the medial meniscus
The meniscal grade in each segment was higher in group II than in group I
In group I, only 2 menisci (4.6% ) showed grade 3 signals, even in the posterior portion of the medial meniscus, vs 21 (50.0%) in group II

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