Relationship between knee osteoarthritis and meniscal shape in observation of Japanese patients by using magnetic resona
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RESEARCH ARTICLE
Open Access
Relationship between knee osteoarthritis and meniscal shape in observation of Japanese patients by using magnetic resonance imaging Tsuneo Kawahara1,2*, Takahisa Sasho3,4, Joe Katsuragi5, Takashi Ohnishi6 and Hideaki Haneishi6
Abstract Background: The aims of this study were to reveal the characteristics of the meniscal shape at each knee osteoarthritis (OA) severity level and to predict trends or patterns of the meniscal shape change as associated with knee OA progression. Methods: Fifty-one patients diagnosed with knee OA based on X-ray and magnetic resonance (MR) images were evaluated. They were divided into three groups based on the Kellgren–Lawrence (KL) grade: normal group (KL grade of 0 or 1), mild group (KL grade of 2 or 3), and severe group (KL grade of 4). We measured the patients’ meniscal size and meniscal extrusion using MR images. In addition, semiquantitative measurement was performed using MR images to determine the arthritic status of the corresponding compartment using a whole-organ magnetic resonance imaging score (WORMS). Results: The longitudinal diameter and posterior wedge angle of the medial meniscus were significantly larger, and the posterior wedge width of the medial meniscus was significantly smaller in the severe group than in the normal group. The WORMS scores for cartilage and osteophytes in the medial region were significantly different among the groups. The WORMS score of each region was strongly correlated with the longitudinal diameter. The WORMS scores of the lateral region were lower than those of the medial region. Conclusion: Our observation of the shape change of the medial meniscus in the posterior region was roughly consistent with that in many previous studies of meniscal degeneration. On the other hand, we saw that the most relevant relation between the progression of the knee OA and the deformation of the meniscus was in the longitudinal direction. Keywords: Meniscus, Knee osteoarthritis, Shape measurement, Deformation pattern, WORMS
Background The number of patients with knee osteoarthritis (OA) has been increasing yearly. Approximately 25.3 million Japanese individuals aged >40 years reportedly had knee OA in 2009 [1]. In recent years, although many reports have described the detection of articular cartilage degeneration on magnetic resonance (MR) imaging for early * Correspondence: [email protected] 1 Graduate School of Engineering, Chiba University, 1-33 Yayoi-cho, Inage-ku, Chiba 263-8522, Japan 2 Medical Corporation Jinseikai, Togane, Japan Full list of author information is available at the end of the article
detection of knee OA [2], the meniscus has received little attention. The meniscus is a fibrocartilage organization that plays several important roles, including load balancing and shock absorbance in the knee joint. However, few papers have focused on the meniscal shape in patients with knee OA [3–6]. The relationship between meniscal deformation and knee OA remains unclear. Although attention has been given to medi
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