Analysis Of Spinopelvic Parameters’ Feature In Post-traumatic Thoracolumbar Kyphosis

Objective To investigate the effect of post-traumatic thoracolumbar kyphosis on spinopelvic parameters and the pattern of pelvic compensation.MethodsPreoperative imaging data of 82 patiens(including 29 males and 53 females)with kyphosis attribute to thoracolumbar fracture treated in the Department of Orthopeadics,Fuyang People’s Hospital in Anhui Province from January 2016 to December 2019 were retrospective analyzed,whole spinal X-ray in lateral staning position was performed in all patients.Spinopelvic parameters were measured in all patients including local kyphosis cobb angle(LKCA),thoracic kyphosis(TK),lumbar lordosis(LL),upper arc of total lumbar lordosis(UALL),lower arc of total lumbar lordosis(LALL),pelvic incidence(PI),pelvic tilt(PT),sacral slope(SS),sagittal vertical axis(SVA).Spino-pelvic parameters in normal asymptomatic population were obtained from the literature.Differences between parameters in different groups and correlation between spinopelvic parameters in patients with post-traumatic thoracolumbar kyphosis were analyzed.ResultsThere was no significant difference in age between PTK patients and asymptomatic people(63.7±5.6 vs 62.4±5.2,P >0.05),Radiograhic measurements: LKCA,TK,LL,UALL,LALL,PI,PT,SS,SVA were 46.4°±14.8°,38.9°±15.2°,37.9°±15.1°,-1.7°±13.9°,40.2°±12.0°,50.9°±11.7°,25.3°±11.1°,25.4°±12.9° and 57.1mm±41.8mm respectively.TK,LALL,PI,PT,SVA were significantly higher than parameters of normal asymptomatic people(P <0.05),LL,UALL and SS were significantly lower than those of normal asymptomatic people(P <0.05),LL was correlated with PI,PT,SS,TK,SVA(P <0.05),SVA was correlated with PI,PT,LL(P <0.05),LALL was significantly correlated with PI,SS(P <0.05),and UALL was significantly correlated with PT,SS,TK(P <0.05).ConclusionPatients with post-traumatic thoracolumbar kyphosis have significant differences in TK,LL,PI,PT,SS,SVA and other parameters with normal asymptomatic people,there was a significant correlation between sagittal spino-pelvic parameters.Local kyphosis causes change in pelvic anatomy parameter,the pelvis is compensated by the state of backward rotation due to imbalance at the same time.Lumbar lordosis should be reasonably planned in the reconstruction of sagittal balance and restoring the normal sequence of local kyphosis is vital in surgical treatment.