Establishment and evaluation of the maximum lumbar lordosis prediction formula in adults

English Keywords:Lumbar lordosis  Predictive formula  Transitional vertebra

English Abstract:

  【Abstract】 Objectives: To establish a new formula for predicting the maximum lumbar lordosis in adults and evaluate its reliability and validity. Methods: The general data and standing full-length lateral X-ray radiographs of 311 healthy adults were collected. The maximal lumbar lordosis (maxLL), maximal thoracic kyphosis(maxTK), sacral slope (SS), pelvic tilt (PT), pelvic incidence (PI) were measured on X-ray radiographs. Pearson correlation analysis was performed to analyze the correlation between maxLL and maxTK, SS, PT, and PI in 220 subjects. The prediction formula of maximum lumbar lordosis was established by multiple regression analysis of variables associated with maxLL. The maxLL of the remaining 91 subjects was predicted by the established formula and compared with the actual measured maxLL to verify the reliability and validity of the prediction formula. Results: MaxLL was correlated with maxTK(r=0.564, P<0.001), SS(r=0.783, P<0.001), PT(r=-0.155, P=0.021) and PI(r=0.483, P<0.001). Multiple regression analysis showed that maxLL was significantly correlated with maxTK and PI(P<0.001), and the established prediction formula was as follows: maxLL=0.6×maxTK+0.5×PI+3(R2=0.55). The maxLL predicted by the formula was 49.32°±7.06°, and the actually measured maxLL was 48.7°±9.46°, with no significant difference(P=0.408). Conclusions: MaxTK and PI are the primary contributors to maxLL. The established prediction formula has good reliability and validity in predicting the maximum lumbar lordosis in adults.