Abstract: Objective To investigate the influence of lumbar spine-pelvic balance on the secondary adjacent vertebral fractures after balloon kyphoplasty. Methods From January 2018 to May 2021, 86 patients with vertebral fracture combined with lumbar degenerative disease who were diagnosed and treated in the Eighth People's Hospital of Dongguan City, Guangdong Province were selected as the research objects. All patients were treated with balloon kyphoplasty, and the patient’s lumbar spine-pelvic balance were judged before the operation. The Oswestry Dysfunction Index (ODI) score of the patients was evaluated and recorded 1 day before and 7 days after the operation; the loss of the height of the injured vertebra and the anterior edge of the adjacent intervertebral space was determined 3 months after the operation. Including high loss, moderate loss and low loss; the patients were followed up 1 year after surgery to observe the fracture of adjacent vertebrae. Results Among the 86 patients, there were 60 patients were preoperative lumbar-pelvic balance (balance group) and 26 patients wewre unbalanced (imbalance group). All patients were recovered and discharged smoothly. The ODI scores of the two groups at 7 d after surgery were lower than that of the preoperative 1 d (P<0.05), and the balance group were lower than the imbalance group, the difference is statistically significant (P<0.05). The high loss rate, moderate loss rate, and low loss rate of the balance group were lower than those of the unbalance group at 3 months after operation, the difference is statistically significant (P<0.05). After 1 year of followed-up, the incidence of secondary adjacent vertebral fractures in the balance group were lower than the unbalance group, the difference is statistically significant (P<0.05). Conclusion Lumbar-pelvic balance reduces the incidence of secondary adjacent vertebral fractures in patients after balloon-expandable vertebral kyphoplasty, and can also reduce the occurrence of height loss of the injured vertebrae and the anterior edge of the adjacent intervertebral space, and promote the recovery of the patient’s lumbar spine features.

Key words: lumbar spine-pelvic balance, balloon kyphoplasty, secondary adjacent vertebral fractures, lumbar spine function, lumbar degenerative disease