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Objectives: This study aims to evaluate facet tropism in younger patients with lumbar spondylolysis and to investigate the role of facet tropism in the development of spondylolysis.
The frequency of facet tropism and the difference between right and left facet joint angles for all three levels were significantly higher in the spondylolysis group (p<0.
Biomechanical studies have also shown that an increased shear force due to facet tropism is a potential risk for lumbar pain, lumbar disc hernia, and degenerative lumbar diseases.
Asymmetry due to facet tropism may cause an impaired balance and non-homogenous load share in the repetitive lumbar movements.
16] In our study, facet tropism was defined as the difference higher than 6[degrees] (equals to 1 SV) in the bilateral FJA measurement.
The frequency of facet tropism and difference between the right and left FJA at all three levels (L3-4, L4-5, and L5-S1) were significantly higher in the spondylolysis group than the control group (p<0.
15] defined facet tropism as the differences higher than 5[degrees] between bilateral FJA.
4,9,11,20] Although the link between facet tropism and lumbar disc hernia, lumbar spondylolysis, and degenerative spondylolisthesis was reported previously, [3,10,21] other studies failed to show the correlation between facet tropism and lumbar degenerative lesions.
Coronal positioning of the facet joints at L5 level and facet tropism may lead to pars fractures due to overload with repetitive sagittal movements.
1] found no relationship between spondylolysis and facet tropism or facet orientation.
14] conducted a study to examine the effects of facet tropism on 120 patients (60 patients with lumbar degenerative spondylosis and 60 patients in the control group).
Facet tropism is a condition of asymmetry in facet joint angles; one facet is orientated more coronally than the other.