Correlation between lumbar posterior muscle and local kyphosis in patients with degenerative thoracolumbar kyphosis

doi:10.12307/2022.439

Abstract

Abstract: BACKGROUND: The relationship between the content of paraspinal muscle and kyphotic severity in patients with degenerative thoracolumbar kyphosis has not been determined yet. Recently, a fresh concept of lumbar crossing indentation value was introduced as a simple method for the measurement of paraspinal muscle.
OBJECTIVE: To identify the characteristics of lumbar paraspinal muscles in patients with degenerative thoracolumbar kyphosis, and to explore the relationship between thoracolumbar kyphosis and body mass index and between thoracolumbar kyphosis and the content of lumbar paraspinal muscles.
METHODS: Totally 90 patients with degenerative thoracolumbar kyphosis (degenerative thoracolumbar kyphosis group) and 62 volunteers without spine deformity (control group) were retrospectively enrolled from June 2015 to June 2020 in the Department of Spine Surgery, Lishui District People’s Hospital with well-matched demographics. The two groups were matched in terms of demographics. Thoracolumbar kyphosis and lumbar lordosis were obtained on the X-ray of the whole spine. Lumbar crossing indentation value was introduced to evaluate the content of the lumbar paraspinal muscles, which was measured from T12-L1 to L4-L5 at T2-MRI axial imaging. Both groups were separately divided into three subgroups of normal weight, overweight and obesity according to body mass index. Degenerative thoracolumbar kyphosis patients were divided into three subgroups of increased lumbar lordosis, normal lumbar lordosis and decreased lumbar lordosis.
RESULTS AND CONCLUSION: (1) The mean lumbar crossing indentation value in degenerative thoracolumbar kyphosis group was less than control group (P < 0.01). Lumbar crossing indentation value showed an increasing trend from T12/L1 to L4/L5 in both groups (P < 0.01). (2) In control group, mean lumbar crossing indentation value in male was larger than that in female (P < 0.05) and mean lumbar crossing indentation value in normal group was less than ones with overweight or obesity (P < 0.05). (3) In the degenerative thoracolumbar kyphosis group, mean lumbar crossing indentation value was not significantly different in both sexes. Significant differences were found in lumbar crossing indentation value in T12-L1 and L1-L2 at different body mass indexes (P=0.003, P=0.009). In degenerative thoracolumbar kyphosis group, mean lumbar crossing indentation value in lumbar lordosis-increased subgroup was larger than that of lumbar lordosis-normal and lumbar lordosis-decreased subgroups (P < 0.01). (4) There was no relationship between thoracolumbar kyphosis and body mass index in both groups. Body mass index was positively correlated to mean lumbar crossing indentation value in control group (P=0.003) with mean lumbar crossing indentation value=0.32×body mass index. Thoracolumbar kyphosis and mean lumbar crossing indentation value were negatively correlated (P < 0.001) in degenerative thoracolumbar kyphosis group with lumbar crossing indentation value=13.75-0.48× thoracolumbar kyphosis. For all cases, there was a relationship of mean lumbar crossing indentation value= 5.45+0.21× body mass index -0.41× thoracolumbar kyphosis. (5) It is indicated that degenerative thoracolumbar kyphosis patients had a less lumbar crossing indentation value than controls. There was no relationship between the severity of thoracolumbar kyphosis and body mass index, while lumbar crossing indentation value and thoracolumbar kyphosis were mutually predictable.

Key words: degenerative thoracolumbar kyphosis, body mass index, lumbar crossing indentation value, lumbar lordosis, lumbodorsal muscle

CLC Number:

Bao Xianguo, Gao Zengxin, Wu Zhanpo, Chen Youmin, Cheng Qinghua, Lu Haitao, Guo Changzheng, Xu Shuai. Correlation between lumbar posterior muscle and local kyphosis in patients with degenerative thoracolumbar kyphosis[J]. Chinese Journal of Tissue Engineering Research, 2022, 26(9): 1418-1423.

Figures/Tables 6

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