GeoGebra: A reliable and free software for measuring acetabular cup anteversion on digitalized plain radiographs

Abstract

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 (0.973e0.989) and 0.986 (0.978e0.991) 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.

Comparison of Spinal Canal Expansion Following Cervical Laminoplasty Based on the Preoperative Lamina Angle : A Simulation Study

“…GeoGebra is a mathematics software program for education that can be used for geometry, algebra, spreadsheets, graphing, statistics and calculus 5) . The program has been used for research in various areas, such as orthopedic trauma, chemistry, veterinary medicine, and environmental management 1,3,12,16,18) . In this simulated study, we have drawn an isosceles triangle into the cross-sectional image of the spinal canal.…”

Local curvature mismatch may worsen the midterm functional outcomes of osteochondral allograft transplantation

“…1). The arcs, whose lengths were known, for the articular cartilage margins of the graft and host condyle were transferred to the online geometry calculating platform GeoGebra (GeoGebra GmbH, Linz, AU) [2] in the Portable Network Graphics (.png) format, and tangents were created separately on each arc according to the measurement technique in Fig. 2.…”