Treatment Of Kyphotic Deformity In Ankylosing Spondylitis With Translamina "V" Shaped Osteotomy And Eggshell Technique: A Retrospective Comparative Study

ObjectiveThis study was to observe the clinical data and imaging features of translamina “V”shaped osteotomy or eggshell technique for the treatment of kyphotic deformity inankylosing spondylitis, in order to explore ankylosing spondylitis cross-sectional bonesurgical procedures the best choice.MethodsThe clinical efficacy was evaluated by observing clinical data such as operative time,blood loss, hospital days. VAS scores, ODI scores to compare in preoperative and finalfollow-up. Bridwell-Dewald spine pain and functional assessment standards compare inpreoperative and final follow-up. Efficacy evaluation content includes: the degree of pain,nature, working conditions and social constraints. Each project includes:0~5level, level5is the most serious, level0is normal. Cobb T1-S1compare in preoperative andpostoperative, the change in end-plate angle、Chin－brow vertical angle and height.ResultsIn group A and group B, the operative time, blood loss and hospital stay from groupA was less than group B (P<0.05). Low back pain was significantly reduced at the finalfollow-up to compared with the preoperative (P<0.01). ODI scores was significantlyreduced at the final follow-up to compared with the preoperative (P<0.01). Bridwell-Dewald Spinal pain and functional assessment were significantly reduced at the finalfollow-up to compared with the preoperative (P<0.01). The Cobb T1-S1Cobb angle weresignificantly reduced at the postoperative to compared with the preoperative (P<0.01).The Cobb T1-S1Cobb angle were improved at the final follow-up to compared with thepostoperative (P<0.05). The Cobb T1-S1Cobb angle of group B was significantlyreduced than group A at the postoperative (P=0.007). The end-plate angle weresignificantly improved at the postoperative to compared with the preoperative(P<0.01).The end-plate angle were improved at the final follow-up to compared with thepostoperative (P<0.05). The end-plate angle of group B was significantly improved thangroup A at the postoperative（P=0.000).The Chin－brow vertical angle were significantly reduced at the postoperative to compared with the preoperative (P<0.01). The Chin－brow vertical angle were improved at the final follow-up to compared with thepostoperative(P<0.05). The Chin－brow vertical angle of group B was significantlyreduced than group A at the postoperative（P=0.012). The height were significantlyimproved at the postoperative to compared with the preoperative (P<0.01). The heightwere reduced at the final follow-up to compared with the postoperative (P<0.05). Theheight of group B was not significantly improved than group A at the postoperative（P=0.097）.ConclusionTranslamina “V” shaped osteotomy and Eggshell technique can obtain betterclinical efficacy. Translamina “V” shaped osteotomy have the advantages of the surgicaltime, blood loss, hospital stay. However, with the Eggshell technique osteotomycorrection angle, the effect is better. Eggshell technique better for patients with severekyphosis.