Abstract
BackgroundBone marrow edema of the sacroiliac joint is the early imaging manifestation, an indicator of inflammatory activity of ankylosing spondylitis (AS) (Yang R, et. al. Medicine (Baltimore) 98:e14620, 2019).ObjectiveThe aim of the study was to investigate the value of magnetic resonance imaging (MRI) Dixon sequence in the diagnosis of marrow edema of the sacroiliac joint in patients with AS.MethodsForty-five patients with AS admitted in our hospital between November 2016 and February 2019 were selected retrospectively as the case group. Forty-five healthy subjects recruited between November 2016 and February 2019 served as the control group. Bath ankylosing spondylitis disease activity index (BASDAI), Bath ankylosing spondylitis functional index (BASFI), C-reactive protein (CRP) and erythrocyte sedimentation rate (ESR) were recorded after admission to the hospital. The Dixon sequence water-fat ratio of the iliac and sacral surfaces of the bilateral sacroiliac joints in the study group were compared with indicators above in order to find the correlation.ResultsThe water-fat ratio under the bilateral sacroiliac joints on Dixon sequence images in the case group was significantly higher than that in the healthy control group (P<0.05). The Dixon sequence water-fat ratio of the iliac and sacral surfaces of the bilateral sacroiliac joints in the study group were positively correlated with spinal arthritis research (SPARCC), BASFI and BASDAI score (all P < 0.05), but did not correlate with ESR and CRP.ConclusionThe water-fat ratio of magnetic resonance Dixon sequence can be used as a reference index to evaluate the degree of bone marrow edema in active stage of sacroiliac arthritis.
Highlights
Bone marrow edema of the sacroiliac joint is the early imaging manifestation, an indicator of inflamma‐ tory activity of ankylosing spondylitis (AS) (Yang R, et al Medicine (Baltimore) 98:e14620, 2019)
The water-fat ratio of magnetic resonance Dixon sequence can be used as a reference index to evaluate the degree of bone marrow edema in active stage of sacroiliac arthritis
Inclusion criteria: Clinical AS patient with the diagnostic criteria of the classification of axial spondylo arthropathy recommended by 2010 Ankylosing Spondylitis International Society (ASAS) criteria [3]; No AS treatment was performed in the past 3 months
Summary
Bone marrow edema of the sacroiliac joint is the early imaging manifestation, an indicator of inflamma‐ tory activity of ankylosing spondylitis (AS) (Yang R, et al Medicine (Baltimore) 98:e14620, 2019). AS is usually diagnosed many years after onset of symptoms [1] It is a type of immune-mediated systemic chronic inflammatory disorder, common in. The damage of articular cartilage injury and edema of bone marrow under the articular surface is the main pathological manifestation of sacroiliac arthritis in the early stage. Du et al BMC Musculoskelet Disord (2021) 22:919 using the X-ray in the early period because of the deep sacroiliac joint location, twisted, close joint surface, and large individual differences. Diagnosis of AS can be made earlier than when using X-ray to find sacroiliac joint lesions with multi-parameter, multi-sequence, multi-directional imaging and high soft tissue resolution characteristics. Dixon sequence is a quantitative measure of tissue water-fat ratio imaging sequence
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