Changes in the spino-pelvic balance after hip replacement in patients with congenital hip dislocation

Objective. To analyze the features of the sagittal spino-pelvic balance formation in patients with congenital hip dislocation and its changes after total hip replacement with restoration of the rotation center. Material and Methods. A retrospective analysis of medical documentation of 47 patients with congenital hip dislocation was performed, a total of 62 total hip replacements were performed. Patients were divided into two groups: Group I with unilateral congenital hip dislocation (n = 26) and Group II – with bilateral hip dislocation (n = 21). The processing and study of statistical correlation were carried out using the Spearman method at p ≤ 0.05. Results. Patients with congenital hip dislocation had average preoperative value of the global lumbar lordosis of 64.1°, and the excess value of the sacral slope angle of 46.4°, which led to hyperlordosis. After surgery, the average value of the global lumbar lordosis was 57.2°, the sacral slope – 41.5°. There was a close relationship between these parameters (r = 0.787). Conclusions. Restoration of the hip rotation center in patients with congenital hip dislocation contributes to a decrease in the sacrum incidence, pelvic anteversion, and lordosis.