Matsuki Kei O, Sasho Takahisa, Nakagawa Koichi, Ochiai Nobuyasu, Yamaguchi Satoshi, Saito Masahiko, Ikegawa Naoshi, Akagi Ryuichiro, Watanabe Atsuya, Wada Yuichi, Matsuki Keisuke, Takahashi Kazuhisa
Department of Orthopaedic Surgery, Graduate School of Medicine, Chiba University, 1-8-1 Inohana, Chuo-ku, Chiba, 260-8670, Japan.
J Orthop Sci. 2011 Jul;16(4):369-75. doi: 10.1007/s00776-011-0062-2. Epub 2011 May 12.
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.
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.
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.
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.
已开发出多种基于磁共振成像（MRI）的膝关节骨关节炎（OA）评估系统。其中，评估整个膝关节状况的全器官磁共振成像评分（WORMS）似乎具有代表性。我们开发了一种不规则指数系统，用于测量MRI上股骨髁轮廓的不规则性。不规则指数仅评估髁的轮廓，而WORMS则考虑了膝关节的几个项目。本研究比较了不规则指数和WORMS与临床评分的相关性。
对31个内侧型OA膝关节进行研究。采用Kellgren-Lawrence分级进行X线分级：8个为II级，11个为III级，12个为IV级。采用日本骨科学会评分和日本膝关节骨关节炎测量评分进行临床评估。我们确定了基于MRI的评估评分与临床评分之间的相关性。
不规则指数和WORMS均与这些临床评分呈正相关。不规则指数与WORMS关节特征中的内侧间室骨囊肿和半月板相关。
这些基于MRI的方法有助于评估OA的严重程度。然而，不规则指数因其半自动特征可能比WORMS具有优势。
