Radiological and optical methods for assessing the spino-pelvic relationships in patients with congenital hip dislocation

Abstract

Objective. To determine the correlation between the data of sagittal radiography of the spine and computer optical topography (COMOT) results. Material and Methods. The study included 47 patients (5 men, 42 women) who underwent the treatment for hip dysplasia in 2010–2018. The patients were divided into two groups: Group I included 26 patients with unilateral congenital hip dislocation, and Group II – 21 pa- tients with bilateral dislocation. All patients underwent hip replacement with corrective osteotomy. Results. An average value of the sacral slope was 46.4° ± 9.9°, which reflects the excessive sacral slope and exceeds the norm (39.6° ± 7.9°) by 10° in cases of maximum values. Global lumbar lordosis has an average value of 64.1° ± 13.5° and directly depends on the sacral slope. The COMOT parameters showed that physiological curves were less pronounced in patients of Group I (the height of the lumbar lordo- sis (HIL), 2.4 ± 0,7 sm, the height of the thoracic kyphosis (HIK), 2.7 ± 0.6 sm) than in patients of Group II (HIL, 3.0 ± 0.5 sm, HIK, 3.2 ± 0.5 sm). In Group II, there was an excessive inclination of the sacrum anteriorly (-33.9° ± 4.5°). In both groups, anterior torso inclination was observed, with greater statistical differences in Group I than in Group II: in Group I, the anterior inclination was -3.5° ± 3.6°, in Group II, -0.4° ± 2.7°. Conclusion. The average correlation was found only between the parameters of the sacral slope and the integral index of the posture state in the sagittal plane (r = 0.513); in all other cases, only a moderate correlation was found.

Keywords

• spino-pelvic balance
• congenital dislocation of the hip
• hip dysplasia
• computer optical topography