半月板损伤程度与膝关节软骨T2值的相关性研究

目的评价半月板损伤与对应软骨T2值的关系。方法回顾性分析90例（168个半月板）行膝关节常规MRI及T2-mapping序列检查的骨关节炎（osteoarthritis,OA）患者。病例按其后角半月板损伤程度分组,0级为对照组（15例）,Ⅰ、Ⅱ、Ⅲ级为病例组（65例）。应用MRI T2-mapping序列测量各组对应于半月板后角的股骨内、外侧髁及胫骨内、外侧髁关节软骨的T2值,探讨半月板损伤与软骨T2值的关系。结果Ⅰ、Ⅱ级与对照组关节软骨T2值差异无统计学意义（P=0.53、0.99）。Ⅲ级关节软骨T2值高于Ⅰ、Ⅱ级组（P〈0.05）和对照组（P〈0.01）。61.7%的Ⅲ级信号见于内侧半月板后角（29/47）。Ⅲ级组胫骨、股骨内侧髁软骨T2值高于胫骨、股骨外侧髁软骨（P〈0.05）。结论半月板Ⅲ级损伤时对应处的关节软骨T2值明显升高,T2-mapping成像对诊断软骨损伤有很高的临床应用价值。

Relation between severity of meniscus injury and T2 value of knee joint cartilage

Objective To assess the relation between severity of meniscus injury and T2 value of knee joint cartilages.Methods Ninety osteoarthritis（OA） patients（168 menisci） who underwent conventional MRI and T2-mapping were retrospectively analyzed.The patients were divided into control group（n=15） with grade 0 meniscus injury and patients group（n=65） with gradesⅠ,Ⅱ,Ⅲ meniscus injury.T2 values of medial femoral and lateral condyle cartilages,and medial tibial and lateral condyle cartilages adjacent to the center of meniscus posterior horn were measured.Relation between severity of meniscus injury and T2 values of knee joint cartilages was studied.Results No significant difference was found in T2 values of knee joint cartilages between patients with gradeⅠ/Ⅱ meniscus injury and controls（P=0.53,P=0.99）.The T2 values of knee joint cartilages were significantly higher in patients with gradeⅢmeniscus injury than in controls and in patients with gradeⅠ/Ⅱmeniscus injury（P0.05）.Signals were observed in medial meniscus posterior horns of 61.7% patients（29/47） with gradeⅢmeniscus injury.The T2 values of medial tibial and femoral cartilages were significantly higher than those of lateral tibial and femoral cartilages in patients with gradeⅢmeniscus injury（P0.05）.Conclusion The T2 values of knee joint cartilages are significantly higher in patients with gradeⅢmeniscus injury.T2-mapping plays an important role in diagnosis of knee joint cartilage injury.