Abstract
Background and PurposePosterior stabilization of the spine is associated with iatrogenic muscle damage. This is discussed to represent an important cause of postoperative pain, especially in open reduction and fixation. The aim of this study was to visualize muscular changes after open or percutaneous posterior stabilization of traumatic thoracolumbar spine fractures and to investigate whether or not these changes are related to the clinical outcome.MethodsThis prospective cohort study was performed between 05/2012 and 10/2014. A group of posteriorly stabilized patients (study group; SG) with traumatic fractures (AOSpine Type A3 or A4) of the thoracolumbar junction (T11–L2) without neurological deficit were matched to a healthy control group (CG) by age, gender and body mass index. Follow-up: 12 months after surgery. Parameters: muscle size, voluntary muscular activation (VMA) using a standardized ultrasound protocol and standardized questionnaires (VAS Spine Score; ODI; SF-36) were analyzed. Statistics: SPSS (Version 20, 76 Chicago, IL, USA). T test, Chi squared test, analysis of variance and a correlation analysis were performed. Significance level was at p < 0.05.ResultsTwenty-five patients (SG) and 23 control individuals (CG) were included. At follow-up, voluntary muscular activation of the lumbar multifidus (LM) as well as the transverse abdominis muscle (TrA) was diminished in all patients compared to the control group (VMA LM at level L3/4: SG 3.2%; CG 5.1%; p < 0.05; VMA TrA: SG 33.43%; CG 37.84%; p < 0.05). Concomitant interviews revealed health restrictions in all patients when compared with the control group. A correlation between muscle function and clinical outcome could not been demonstrated (rs > 0.07; NS).ConclusionIn surgically treated A3 and A4 fractures, there is continuous muscular deficit 1 year after surgery as documented by ultrasound and clinical control. But, by means of our study we conclude that those muscular deficits alone seem not to be decisive for the clinical outcome 1 year after surgery.
Highlights
Background and PurposePosterior stabilization of the spine is associated with iatrogenic muscle damage
By means of our study we conclude that those muscular deficits alone seem not to be decisive for the clinical outcome 1 year after surgery
The function of the lumbar multifidus and the transverse abdominis muscle is still compromised in patients 1 year after posterior stabilization of traumatic fractures of the thoracolumbar junction
Summary
Posterior stabilization of the spine is associated with iatrogenic muscle damage. This is discussed to represent an important cause of postoperative pain, especially in open reduction and fixation. The aim of this study was to visualize muscular changes after open or percutaneous posterior stabilization of traumatic thora‐ columbar spine fractures and to investigate whether or not these changes are related to the clinical outcome. The literature suggests that percutaneous stabilization is associated with less iatrogenic muscle trauma when compared with open fixation [1, 2], but to date it is unclear whether this affects the clinical outcome. The lumbar multifidus (LM) and the transversus abdominis muscle (TRA) play an important role in spine stabilization [3,4,5,6]. It is discussed that deficits of this muscle may result in low back pain [8]
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