The paper gives an overview of the algorithms developed to obtain reference lines and angles on X-ray images. These geometrical characteristics are used in the medical analysis of human
joints. We propose the algorithm’s modifications based on the analysis of numerous X-ray images.These modifications allowed obtaining a great increase in calculation speed and the improvement
of final results quality given by the corresponding application. They also lead to a significant reduction of manual tuning of the program, arising only in the rare cases when the properties of given
images differ significantly from the mean ones.The authors are grateful to the experts from Iraq – Al-Abayechi Sinan Adnan (Medicine Iraqi Board of Orthopedic Surgery) and Bassam Faleh Hassan (Medicine Arabic
Board of Diagnostic Radiology) who attracted the attention to this investigation. They provided us with X-ray materials, gave important advice connected with the implementation and discussed the obtained results
