RADIOLOGICAL EVALUATION OF NORMAL SAGITTAL VERTEBRAL, PELVIS AND GLOBAL SPINOPELVIC PARAMETERS IN A YOUNG ADULT TURKISH POPULATION

Abstract

Objective: Normal values of sagittal vertebral, pelvis and global spinopelvic parameters have been reported to vary from society to society. The aim of this study was to determine these parameters in a young adult Turkish population and to evaluate the relationship between the sagittal spinopelvic measurements. This was the first study on this subject in a Turkish population. Materials and Methods: The study included a total of 170 subjects comprising 137 (80.6%) males and 33 (19.4%) females, with a mean age of 24.1±4.9 years. Anteroposterior and lateral spine X-rays and pelvis X-rays were performed to evaluate the sagittal vertebral, pelvis and global spinopelvic parameters. Patients were classified according to the Roussouly classification system to classify normal variations of the vertebrae, pelvis and sacrum in the sagittal plane. Normal distribution of the variables was examined with the Shapiro-Wilk test. The Independent Samples t-test was used in the comparison of mean values. Results: The mean and standard deviation values for sagittal vertical axis (SVA), spinopelvic inclination (T1Slop, T1SPi) , thoracic kyphosis, lumbar lordosis (LL), pelvic tilt, pelvis incidence (PI) and sacral slope values were 2.7±3.8, 13.5±7.5, -6.3±7.5, 29.6±9.8, 49.7±12.2, 11.6±7.3, 45.1±12.4 and 36.2±8.5, respectively. According to the Roussouly classification, 15.9% of the participants were classified as type 1, 32.3% type 2, 34.7% type 3, and 17.1% type 4. A statistically significant weak negative correlation was found between PI and T1SPi and a weak positive correlation was determined between PI and LL. No statistically significant correlation was determined between T1SPi and SVA. Conclusion: One hundred and eighty-seven asymptomatic young adult Turkish volunteers were evaluated in terms of some pelvic angles and the physiological standard ranges of spinal parameters defining spinal balance and the ratios were determined according to the Roussouly sagittal morphological classification. The results showed a negative correlation between T1SPi and PI.