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Journal of Orthopaedic Science
Published in: Journal of Orthopaedic Science 4/2011

01-07-2011 | Original Article

Comparison of MRI-based assessment systems for osteoarthritic knees: the irregularity index system and WORMS

Authors: Kei O. Matsuki, Takahisa Sasho, Koichi Nakagawa, Nobuyasu Ochiai, Satoshi Yamaguchi, Masahiko Saito, Naoshi Ikegawa, Ryuichiro Akagi, Atsuya Watanabe, Yuichi Wada, Keisuke Matsuki, Kazuhisa Takahashi

Published in: Journal of Orthopaedic Science | Issue 4/2011

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Abstract

Purpose

Several MRI-based evaluation systems for osteoarthritis (OA) of the knee have been developed. Among them the whole-organ magnetic resonance imaging score (WORMS), which evaluates the status of the entire knee joint, appears to be representative. We developed an irregularity index system to measure irregularities of the contours of the femoral condyle on MRI. Only the contour of the condyle was assessed by the irregularity index, whereas several items comprising the knee joint were taken into account by WORMS. This study compared the irregularity index and WORMS in terms of their correlations with clinical scores.

Methods

Thirty-one medial-type OA knees were studied. Kellgren-Lawrence grading was used for X-ray grading: 8 were grade II, 11 were grade III, and 12 were grade IV. Japanese Orthopaedic Association scores and Japanese knee osteoarthritis measure scores were used for clinical assessments. We determined the correlations between MRI-based assessment scores and clinical scores.

Results

Both the irregularity index and WORMS exhibited positive correlations with these clinical scores. The irregularity index was associated with bone cysts of the medial compartment and menisci in the articular features of WORMS.

Conclusions

These MRI-based methods are useful for evaluating OA severity. However, the irregularity index may have advantages over WORMS because of its semi-automatic features.
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Metadata
Title
Comparison of MRI-based assessment systems for osteoarthritic knees: the irregularity index system and WORMS
Authors
Kei O. Matsuki
Takahisa Sasho
Koichi Nakagawa
Nobuyasu Ochiai
Satoshi Yamaguchi
Masahiko Saito
Naoshi Ikegawa
Ryuichiro Akagi
Atsuya Watanabe
Yuichi Wada
Keisuke Matsuki
Kazuhisa Takahashi
Publication date
01-07-2011
Publisher
Springer Japan
Published in
Journal of Orthopaedic Science / Issue 4/2011
Print ISSN: 0949-2658
Electronic ISSN: 1436-2023
DOI
https://doi.org/10.1007/s00776-011-0062-2

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Erratum

Erratum to: Arthroscopic removal of intra-articular osteoid osteoma in the knee: case report and review of the literature