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J Orthop Surg Res. 2019 Sep 3;14(1):290. doi: 10.1186/s13018-019-1339-y.

Does lumbar lordosis minus thoracic kyphosis predict the clinical outcome of patients with adult degenerative scoliosis?

Zhou S1,2, Li W1,2, Su T1,2, Du C1,2, Wang W1,2, Xu F1,2, Sun Z1, Li W3.

Author information

1
Department of Orthopaedic, Peking University Third Hospital, No. 49 North Garden Road, Haidian District, Beijing, 100191, China.
2
Peking University Health Science Center, No. 38 Xueyuan Road, Haidian District, Beijing, 100191, China.
3
Department of Orthopaedic, Peking University Third Hospital, No. 49 North Garden Road, Haidian District, Beijing, 100191, China. puh3liweishi@163.com.

Abstract

PURPOSE:

To evaluate the predictive effect of lumbar lordosis minus thoracic kyphosis (LL-TK) in the surgical outcome of adult degenerative scoliosis (ADS) patients and explore the optimum target base on it.

METHODS:

The preoperative and postoperative data including radiographic image and functional evaluation (Visual Analog Scale, VAS; Oswestry Disability Index, ODI; Japanese Orthopaedic Association, JOA) of 130 patients with ADS who underwent corrective surgery was retrospectively reviewed. The relationship between sagittal parameters and surgical outcome was assessed by using the Pearson correlation analysis. Receiver operating characteristic (ROC) curve was used to define the optimum cutoff value of LL-TK. Patients were divided into two groups based on LL-TK to compare the preoperative and postoperative status.

RESULTS:

LL-TK assessed soon after surgery strongly correlated with health-related quality of life (HRQOL) and sagittal vertical axis (SVA) at last follow-up. The cutoff value of LL-TK was set at 10° to determine a good clinical outcome (ODI < 20) and sagittal balance (SVA < 50 mm). Patients with LL-TK > 10° presented significantly better postoperative VAS, ODI, JOA, and SVA than patients with LL-TK < 10°.

CONCLUSION:

LL-TK could effectively predict postoperative HRQOL and sagittal balance for patients with ADS. Patients with LL-TK > 10° showed a better clinical outcome and sagittal balance, so LL-TK > 10° could be the optimum corrective target for these patients.

KEYWORDS:

Adult degenerative scoliosis; Adult spinal deformity; Corrective surgery; Lumbar lordosis; Sagittal balance; Thoracic kyphosis

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