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中华临床医师杂志(电子版) ›› 2022, Vol. 16 ›› Issue (08) : 744 -748. doi: 10.3877/cma.j.issn.1674-0785.2022.08.007

所属专题: 骨科学

临床研究

CT横断面测量指标对髌骨脱位的诊断价值
王海军1, 宋一凡1, 余家阔1,()   
  1. 1. 100191 北京,北京大学第三医院运动医学科 北京大学运动医学研究所 运动医学关节伤病北京市重点实验室
  • 收稿日期:2022-03-09 出版日期:2022-08-15
  • 通信作者: 余家阔

Diagnostic value of CT cross-sectional measurements for patellar dislocation

Haijun Wang1, Yifan Song1, Jiakuo Yu1,()   

  1. 1. Sports Medicine Department, Peking University Third Hospital, Institute of Sports Medicine of Peking University, Beijing Key Laboratory of Sports Injuries, Beijing 100191, China
  • Received:2022-03-09 Published:2022-08-15
  • Corresponding author: Jiakuo Yu
引用本文:

王海军, 宋一凡, 余家阔. CT横断面测量指标对髌骨脱位的诊断价值[J/OL]. 中华临床医师杂志(电子版), 2022, 16(08): 744-748.

Haijun Wang, Yifan Song, Jiakuo Yu. Diagnostic value of CT cross-sectional measurements for patellar dislocation[J/OL]. Chinese Journal of Clinicians(Electronic Edition), 2022, 16(08): 744-748.

目的

探讨膝关节横断面CT测量TT-TG间距、髌骨倾斜角和髌骨外偏角对髌骨脱位的诊断价值。

方法

回顾性分析2013年至2016年北京大学第三医院153例髌骨脱位患者和151例对照组患者的临床资料,CT扫描测量胫骨结节-股骨滑车沟(TT-TG)间距、髌骨倾斜角和髌骨外偏角,比较上述指标的组间差异。采用受试者工作特征(ROC)曲线观察各指标的曲线下面积(AUC),并以约登指数最大点作为诊断界值。

结果

2组患者的年龄、性别、侧别、身高、体重、Insall指数、股骨宽度和胫骨宽度的差异均无统计学意义,髌骨脱位患者的TT-TG间距、髌骨倾斜角和髌骨外偏角分别为(19.4±4.4)mm、(27.5±8.3)°和(42.8±20.7)°,对照组分别为(12.2±4.1)mm、(11.5±6.4)°和(15.6±16.1)°,2组的差异均有统计学意义(P<0.001)。三个测量指标对髌骨脱位的诊断均有价值,AUC均大于0.85,最佳临界值(O0P)分别为15.9 mm、20.8°和31.1°。

结论

TT-TG间距、髌骨倾斜角和髌骨外偏角对髌骨脱位均具有较好的诊断价值。

Objective

To investigate the diagnostic value of knee cross-sectional CT measurements of tibial tuberosity-trochlear groove (TT-TG) distance, patellar tilt angle, and patellar deviation angle for patellar dislocation.

Methods

From 2013 to 2016, 153 patients with patellar dislocation and 151 controls at Peking University Third Hospital were analyzed retrospectively. TT-TG distance, patellar tilt angle, and patellar deviation angle were measured on axial CT images. The performance of TT-TG distance, patellar tilt angle, and patellar deviation angle in predicting patellar dislocation was assessed by the receiver operating characteristic (ROC) curve analysis.

Results

No significant difference was found between the two groups in age, sex, knee size, height, weight, Insall-Salvati index, femoral width, or tibial width. The mean TT-TG distance, patellar tilt angle, and patellar deviation angle in the patellar dislocation group were 19.4 mm, 27.5°, and 42.8°, respectively, which were significantly greater than those of the control group (12.2 mm, 11.5°, and 15.6°, respectively). ROC curve analysis suggested that TT-TG distance, patellar tilt angle, and patellar deviation angle could be efficient to diagnose patellar dislocation. All the three measurements had good value in diagnosing patellar dislocation, with the area under the curve values greater than 0.85, and their optimal cutoff values were 15.9, 20.8°, and 31.1°, respectively.

Conclusion

TT-TG distance, patellar tilt angle, and patellar deviation angle have high value in diagnosing patellar dislocation.

表1 髌骨脱位和对照组患者的一般临床资料
图1 左膝关节CT测量。图a为经胫骨结节最凸点做垂直于股骨内、外髁后缘连线的参照线;图b为髌骨倾斜角的测量;图c为股骨宽度测量;图d为TT-TG间距测量;图e为髌骨外偏角测量;图f为胫骨宽度测量 注:a线为股骨内、外髁后缘连线;b线为经滑车沟最低点做垂直于a线的参照线;c线为经胫骨结节最凸点做垂直于a线的参照线;d线为髌骨横断面的最大长轴线;e线为滑车沟最低点与髌骨嵴顶点的连线;f线为通过腓骨尖的胫骨后缘连线。TT-TG间距为b线与c线之间的垂直距离。髌骨倾斜角为d线与a线的夹角。髌骨外偏角为e线与b线的夹角,如果髌骨嵴顶点在b线外侧,角度值为正值,在内侧为负值。股骨宽度为垂直于a线的股骨远端内外侧缘的最大宽度。胫骨宽度为垂直于f线的胫骨近端内外侧缘的最大宽度
表2 测量指标对髌骨脱位的诊断效能
图2 TT-TG,股骨倾斜角和股骨外偏角诊断髌骨脱位的ROC曲线 注:TT-TG为胫骨结节-股骨滑车沟间距
表3 不同阈值对髌骨脱位的诊断效能
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