GeoGebra：一款用于在数字化平片上测量髋臼杯前倾角的可靠且免费的软件。
GeoGebra: A reliable and free software for measuring acetabular cup anteversion on digitalized plain radiographs.
作者信息
Bachhal Vikas, Saini Gaurav, Jindal Nipun, Sament Radheshyam, Dadra Ankit
机构信息
Department of Orthopaedics, PGIMER, Sector 12, Chandigarh, India.
Max Superspeciality Hospital, Phase 1, Mohali, Punjab, India.
出版信息
J Clin Orthop Trauma. 2020 Mar;11(Suppl 2):S201-S205. doi: 10.1016/j.jcot.2020.02.001. Epub 2020 Feb 5.
OBJECTIVE
Although accurate measurement of cup anteversion in hip replacement requires CT scans, however, its routine application, especially during follow-up, remains economically and ethically unreasonable. Thus, several methods have been devised for making this measurement on plain radiographs. In recent years, several ways have been adopted using software on digital radiographs. We present one such method which uses open access mathematical software GeoGebra.
METHODS
Anteversion was measured on 72 radiographs (36 cemented; 36 uncemented) by three different observers using this software. One observer repeated measurements at three weeks interval.
RESULTS
The intraclass correlation coefficient for interobserver variability and intraobserver variability was 0.982 (0.973-0.989) and 0.986 (0.978-0.991) respectively. There was a significant difference in the reliability of the method for cemented and uncemented cups with higher reliability for cemented cups (p < 0.001).
CONCLUSION
GeoGebra software can be used as a reliable alternative for measuring acetabular cup anteversion on good quality well centred digital radiographs of the pelvis.
目的
尽管髋关节置换术中髋臼前倾角的精确测量需要CT扫描，但其常规应用，尤其是在随访期间，在经济和伦理上仍然不合理。因此，已经设计了几种在普通X线片上进行该测量的方法。近年来，在数字X线片上采用了几种使用软件的方法。我们介绍一种使用开源数学软件GeoGebra的此类方法。
方法
三名不同的观察者使用该软件在72张X线片（36张骨水泥型；36张非骨水泥型）上测量前倾角。一名观察者每隔三周重复测量一次。
结果
观察者间变异性和观察者内变异性的组内相关系数分别为0.982（0.973 - 0.989）和0.986（0.978 - 0.991）。骨水泥型和非骨水泥型髋臼杯测量方法的可靠性存在显著差异，骨水泥型髋臼杯的可靠性更高（p < 0.001）。
结论
在骨盆质量良好且居中的数字X线片上，GeoGebra软件可作为测量髋臼杯前倾角的可靠替代方法。
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