Objective. To analyze the correlation of the acetabular component (AC) position criteria with the sagittal balance criteria in pelvic trans-lation associated with body posture change from a standing to a sitting position and vice versa.

Material and Methods. A prospective study of 20 patients who underwent hip arthroplasty for unilateral coxarthrosis, in the absence ofsigns of arthrosis and dysfunction of the contralateral joint was conducted. A the 20th week after surgery, an X-ray examination of the spine and hip joints was performed with an analysis of anteversion, inclination, AC ante-tilt, PT, SS, PTsit. A search for correlations between the indicators was carried out using the Spearman correlation method. Numerical associations were identified by calculating the Pearson correlation coefficients. Statistical hypotheses were tested at a critical significance level of 0.05, i.e. the difference was considered statisti-cally significant when the level of p <0.05 was achieved.

Results. A direct correlation was found between the changes in the sagittal balance parameters (SS, PT) and the AC position. Compari-son of the mean values and medians of the studied parameters measured in the standing and sitting positions showed the high correlationbetween them. The same dynamics of changes in the values between the AC ante-tilt and pelvic PT parameters was noted. A high direct correlation of the difference (Δ) in the AC ante-tilt values with PT in standing position, and a strong correlation of Δ in the AC ante-tilt values with PT in sitting position indicates an indirect relationship between the sagittal balance parameters and the AC position param-eters through the AC ante-tilt parameter. This is confirmed by the strong direct correlation of Δ (sitting/standing) PT with Δ (sitting/standing) AC inclination (0.67) and Δ (sitting/standing) AC ante-tilt (0.82), and by an inverse correlation of Δ (sitting/standing) SS with Δ (sitting/standing) AC inclination and Δ (sitting/standing) AC ante-tilt (–0.7).

Conclusion. Comparison of sagittal balance parameters (SS, PT) measured in standing and sitting positions with the position of the AC showed their direct high correlation with each other. Acetabular ante-tilt serves as a connecting criterion between sagittal balance param-
eters and the spatial position of the acetabular cup.

Keywords: coxarthrosis; total hip arthroplasty; dislocation of the femoral head; sagittal balance; anteversion; ante-tilt; safe zone; pelvictilt; hip-spine syndrome

Turgunov Eminjon Nematovich received higher medical education in 2009 in Uzbekistan. Since 2009, he has been working as an orthopedic surgeon, researcher, and teacher at Althawra Hospital Al Hudaydah, Republic of Yemen for 14 years. He has 2 publications in two scientific medical journals in Russia.