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| REVIEW ARTICLE |
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| Year : 2019 | Volume
: 27
| Issue : 1 | Page : 3-12 |
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Reliability of ultrasound for the detection of rheumatoid arthritis
Rabia Hassan, Sobia Hussain, Raham Bacha, Syed Amir Gillani, Sajid Shaheen Malik
Faculty of Allied Heath Sciences Department, University Institution of Radiological Sciences and Medical Imaging Technology, The University of Lahore, Lahore, Pakistan
| Date of Submission | 15-Jan-2018 |
| Date of Acceptance | 12-Nov-2018 |
| Date of Web Publication | 26-Feb-2019 |
Correspondence Address:
Dr. Rabia Hassan
Ibrahim street Awan Town Multan Road Lahore, The University of Lahore, Lahore
Pakistan
 Source of Support: None, Conflict of Interest: None  | 7 |
DOI: 10.4103/JMU.JMU_112_18
The aim of this review article was to investigate the pooled sensitivity and specificity of musculoskeletal ultrasound (MSUS) for the detection of synovitis and early bone erosion in the small joint in rheumatoid arthritis (RA). In addition, investigate the pooled sensitivity and specificity of Power Doppler ultrasonography (PDUS) for the detection of synovial hypervascularity in small joints in RA. A systematic literature search of PubMed, Wiley online library, Google Scholar, Research gate, E-book, BioMed Central, the Journal of Rheumatology and Springer Link were investigated from 2001 to 2017. Original researches related to the article written in English including RA, synovitis, bone erosion, grayscale, and PDUS were included in this study. The sample size, study design, sensitivity, and specificity were analyzed. The review summarizes the value of MSUS for the detection of RA as it is the first choice of modality. Results show the acceptable reliability of US for the diagnosis of early bone erosions, synovitis, and synovial hypervascularity.
Keywords: Bone erosion, rheumatoid arthritis, sensitivity, synovitis
How to cite this article:
Hassan R, Hussain S, Bacha R, Gillani SA, Malik SS. Reliability of ultrasound for the detection of rheumatoid arthritis. J Med Ultrasound 2019;27:3-12 |
How to cite this URL:
Hassan R, Hussain S, Bacha R, Gillani SA, Malik SS. Reliability of ultrasound for the detection of rheumatoid arthritis. J Med Ultrasound [serial online] 2019 [cited 2023 Mar 22];27:3-12. Available from: http://www.jmuonline.org/text.asp?2019/27/1/3/252983 |
| Introduction | |  |
Rheumatoid arthritis (RA) is a long-term autoimmune disease and inflammatory disorder. It affects the synovial membrane resulting in synovitis that is a primary abnormality and leads to structural destruction such as bone erosions, cartilage damage.[1],[2],[3] Small joints are frequently involved in RA such as metacarpophalangeal (MCP) joints, proximal interphalangeal (PIP) joints and metatarsophalangeal (MTP) joints.[4] Early and accurate diagnosis of structural damage is necessary for early treatment.
Musculoskeletal ultrasound (MSUS) is, nowadays, widely used worldwide for the diagnosis of RA.[5],[6] Magnetic resonance imaging (MRI) is considered a sensitive imaging modality for the detection of synovitis, joint effusion, and early bone erosions.[7] However, MRI has some limitations and disadvantages as it is expensive and not easily accessible.[8] In contrast, US is readily available, relatively cheap, easy to tolerate by the patient, free of bioeffects and portable. It is, therefore, the modality of choice due to its numerous benefits.[9] Several studies have reported that US is more sensitive and specific technique for the detection of RA as compared to clinical assessment and laboratory examination.[10],[11],[12],[13]
On gray-scale US (GSUS), the inflammatory and destructive activity of small joints in RA can be visualized with the help of high-frequency linear array transducer.[10],[12] Power Doppler ultrasonography (PDUS) is a good tool for the evaluation of inflammatory activity of joints in RA. Blood flow to the Synovial membrane can be detected by PDUS.[14],[15],[16]
Bone erosion is another sign of RA; however, it also is seen in other rheumatoid diseases.[17] Early bone erosions changes in RA cannot be detected by conventional radiography (CR); however, the US and other imaging modalities can detect the earliest bone erosive changes.[18] Hence, the review is aimed to justify the “use of US in the diagnosis of RA by evaluating its reliability.
| Methodology | | |
Articles were collected related to our topic from 2001 to 2017. Thirty-six articles were studded in which twenty-nine articles were included and summarized. Seven articles were excluded in which two articles reported large joints such as shoulder and knee.[19],[20] The remaining five articles were not provided sufficient information regarding RA as they mention the keywords of RA[21],[22],[23],[24],[25] These articles were provided by the university library and online source of PubMed, Google Scholar, AJR, and Wiley online library, BMJ Journal, Researchgate, E-book, BioMed Central, The Journal of Rheumatology and Springer Link. Seventeen articles reported the sensitivity and specificity of US for the detection of synovitis, synovial hypervascularity and bone erosion in which 934 patients were examined that have RA.[7],[10],[11],[13],[14],[17],[26],[27],[28],[29],[30],[31],[32],[33],[34],[35] Different types of studies such as cohort study, case–control study, and case study were included in this study.
| Synovitis | | |
MSUS (including GS and PDUS imaging) is a reliable and useful tool for the detection of synovitis. GSUS often detects the signs of synovitis such as synovial hypertrophy and synovial fluid or effusion.[16] Previous five studies discussed the sensitivity and specificity of US for the detection of synovitis by comparing with different modalities such as MRI, CR, laboratory, and clinical assessments that are summarized in [Table 1].[10],[13],[18],[27],[33] PDUS has increased the sensitivity of US and able to detect the synovial hypervascularity in small joints. Previous four studies have discussed the sensitivity and specificity of PDUS for the detection of hypervascularity in RA and compare with different modalities such as MRI, CR, laboratory, and clinical examination that is summarized in [Table 2].[14],[27],[28],[29] | Table 1: Sensitivity and specificity of grayscale ultrasonography for the diagnosis of small joints synovitis
Click here to view |
 | Table 2: Sensitivity and specificity of power Doppler ultrasonography for the detection of synovial hypervascularity of small joints
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Previous five studies reported the sensitivity and specificity of GSUS for the detection of synovitis.[10],[13],[18],[27],[33] The sensitivity of GSUS for the detection of synovitis ranged from 47.4% to 92% as shown in [Table 1]. However, we have excluded the 47.4% sensitivity as it decreased the mean sensitivity.[27] The specificity of GSUS ranged from 74% to 90.9% as shown in [Table 1]. However, we were excluded Freeston et al., study as this study reported low sensitivity.[27] A study conducted by authors; Szkudlarek et al., in 2004 with the objective to compare the US with MRI, CR and clinical examination in the evaluation of bone destruction and signs of inflammation in the MTP joints of patients with RA. They have assessed one hundred MTP joints of twenty healthy control and two hundred MTP joints of forty patients with RA. They were assessed synovitis in 36 patients, 31 patients, and 21 patients with the help of US, MRI, and clinical examination, respectively. They were considered the MRI as a reference method and reported the US sensitivity 87% and specificity 74% for MTP joints, while for clinical examination, the corresponding values 43% and 89%. They evaluated that by comparing with MRI, US was found to be more sensitive and accurate than CR and clinical examination.[18] Another study conducted by authors; Scheel et al., in 2005 with the objective to evaluate the synovitis with help of US of finger joints in patients with active RA. They were performed MRI in 10 patients and compared the results with the US and found a good correlation between MRI and US for the detection of synovitis. They were reported US sensitivity 94% and specificity 89% for MCP and sensitivity 90% and specificity 88% for PIP joints for the detection of synovitis. Hence, the sensitivity and specificity for MTP joints were high.[13] Another study conducted by authors; Szkudlarek et al., in 2006 with the objective of to investigate whether US can provide information synovitis that is not available with CR and clinical examination and also compare with MRI. T1-weighted MRI sequences as the reference method, they were reported the US sensitivity 70% and specificity 78% for MCP and PIP joints with synovitis and reported 40% sensitivity and 85% specificity for the clinical examination. Their results indicated that with MRI as a reference method the US had higher sensitivity and accuracy.[10] Another study conducted by authors; Wakefield et al., in 2008 with the objective of compare clinical examination and the US with high-field MRI as the reference method for the detection of synovitis in RA. They have compared MRI as the gold standard with clinical examination and with the US reported the sensitivity 76% and specificity 70% for hind foot. They were reported clinical examination sensitivity 69% and specificity 34.5% for the detection of synovitis. They evaluated that US is more sensitive and specific than clinical examination when compared with MRI as Gold standard.[33] According to four studies, the pooled sensitivity and specificity of GSUS for the detection of synovitis of small joints is 83.5% and 79.8%, respectively, as shown in [Table 3] and [Graph 1]. All these above studies agreed with pooled sensitivity and specificity of US for the detection of synovitis. | Table 3: Pooled sensitivity and specificity of musculoskeletal ultrasound
Click here to view |
Previous four studies reported the sensitivity and specificity of PDUS ranged from 71.1% to 92% and 40% to 97.9%, respectively mentioned in [Table 2]. A study conducted by authors; Szkudlarek et al., in 2001, with the objective of to diagnose the effectiveness of PDUS for the evaluation of inflammatory activity in the MCP joints of patients with RA, using T1-weighted MRI sequences as a reference method. They have assessed 54 MCP joints of 15 patients with active RA and 12 MCP joints of three healthy controls. They were detected flow signal on PDUS in 17 of 54 MCP joints in RA patients. They were reported a good sensitivity of 88.8% and specificity 97.9% for MCP joints.[14] Another study conducted by authors, Kiris et al., in 2006 with the objective of to evaluate synovial vascularity and flow pattern in MCP joints and ulnar styloid regions of hand and wrist of patients with RA. They have examined 240 MCP joints and 48 ulnar styloid regions in 24 patients with RA. They were reported good sensitivity 92% but not good specificity 40% MCP and USLT regions. Hence, we have not included Kiris et al., study as it too much decreased the overall mean specificity.[29] Another study conducted by Freeston et al., in 2010 with the objective of assesses the value of PDUS in patients with early RA. They have examined 50 patients with or without a sign of early RA with the help of clinical, laboratory, and imaging assessments. They were reported sensitivity 71.1% and specificity 81.1% for hand and wrist joints.[27] Another study conducted by authors; Harman et al., in 2015 with the objective to evaluate the efficacy of PDUS for the detection of RA and compare the PDUS findings with contrast-enhanced MRI. They were examined the wrist and hand joint including MCP and PIP joints using MRI and US. They have enrolled 31 patients with early RA and included 279 joints in the study reported the sensitivity of 73% and specificity 76% for finger joints.[28] According to three studies, the pooled sensitivity and specificity of PDUS for the detection of synovial hypervascularity of small joints is 77.633% and 85.233% as shown in [Table 3] and [Graph 2]. All these above studies agreed with pooled sensitivity and specificity of US for the detection of synovial hypervascularity.
| Bony Erosion | | |
US is increasingly being used for the detection of early destructive changes in RA.[36] Previous eleven studies have described the sensitivity and specificity of US for the diagnosis of early bone erosions and these studies also discussed the US comparison with MRI, CR, CT, and clinical assessment.[7],[10],[11],[17],[18],[26],[30],[31],[32],[34],[35] A number of articles have shown the sensitivity and specificity of US for the detection of RA that is mentioned in [Table 4]. | Table 4: Sensitivity and specificity of ultrasonography for the detection of bone erosion in rheumatoid arthritis in small joints
Click here to view |
These studies described the sensitivity and specificity ranged from 32.9%–100% to 85.19%–98% respectively as shown in [Table 4]. Some studies described the US sensitivity and specificity for the detection of bone erosions with MRI as a reference method.[7],[18],[26],[31],[32],[35] Moreover, some studies described the US sensitivity and specificity for the detection of bone erosions with CT as the reference method. These studies described the lower sensitivity of US for bone erosion.[17],[26],[30],[32] According to Rashad et al., in 2014, reported (100%) sensitive and 85.19% specificity for foot joints bone erosions and 58.33% sensitivity and 91.67% specificity for hand joints bone erosions.[31] Remaining nine studies reported sensitivity ranged from 32.9% to 83% and specificity ranged from 85.19% to 98% for the small joint as summarized in [Table 4].[7],[10],[11],[17],[18],[26],[32],[34],[35] In 2015 Peluso et al., reported very low sensitivity only 9% that was not included as it decreased the mean.[30]
A study conducted by authors; Szkudlarek et al., in 2004 with the objective to compare the US with MRI, CR and clinical examination in the evaluation of bone destruction and signs of inflammation in the MTP joints of patients with RA. They have assessed one hundred MTP joints of twenty healthy control and two hundred MTP joints of forty patients with RA. They have diagnosed bone erosions in 26 patients with the help of US, compared with MRI and radiography as these modalities diagnosed 20 patients and 11 patients, respectively. They were reported the sensitivity of US and radiography as 79% and 32%, respectively, by compared with MRI as the standard method. They were reported the specificity of US and radiography as 97% and 98% respectively with MRI as a reference method.[18]
Another study conducted by authors; Døhn et al., in 2006 with the objective of to evaluate whether bone erosions in RA in MCP joints diagnosed with MRI and US, but not with radiography, represent with true bone erosive changes. They have examined 17 patients with RA and four healthy controls. With CT as the reference method, they have detected the sensitivity, specificity, and accuracy for bone erosions as 19%, 100%, and 81%, l respectively, for radiography; 68%, 96%, and 89%, for MRI; and 42%, 91%, and 80% for the US. Hence, they were reported MRI and US had high specificity for the detection of bone erosions.[32]
Another study conducted by authors; Szkudlarek et al., in 2006 with the objective of to investigate whether US can provide information bone destruction in RA fingers joint that are not available with CR and clinical examination and also compare with MRI. T1-weighted MRI sequences as the reference method, they were reported the sensitivity, specificity, and accuracy as 59%, 98%, and 96%, respectively, for the US; 40%, 99%, and 95% for the radiography.[10]
Another study conducted by authors; Døhn et al., in 2011 with the objective to evaluate the bone erosions in patients with RA using MRI, US, radiography, and CT. They have examined 52 patients with RA. The sensitivities and specificities for bone erosion in MCP joint were 68% and 92% for MRI; 44% and 95% for the US; and 26% and 98% for radiography, with CT as the reference method.[26]
According to eight studies, the pooled sensitivity is 58.385% and pooled specificity is 93.85% as shown in [Table 3] and [Graph 3]. All the above studies agreed with pooled sensitivity and specificity of US for the detection of bone erosions.
| Review Results | | |
The pooled sensitivity and specificity of GSUS for the detection of synovitis of small joints were 83.5% and 79.8%, respectively. The pooled sensitivity and specificity of PDUS for the detection of synovial hypervascularity were 77.633% and 85.23%, respectively. The pooled sensitivity and specificity of US for the detection of early bone erosion were 58.385% and 93.859%, respectively.
| Conclusion | | |
The US has good pooled sensitivity and specificity for the detection of synovitis and synovial hypervascularity. The specificity of US for the detection of bone erosions is high, but sensitivity is low so examiner should be familiar with the use of US for the evaluation of bone erosions in small joints in early RA.
Financial support and sponsorship
Nil.
Conflicts of interest
There are no conflicts of interest.
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[Table 1], [Table 2], [Table 3], [Table 4]
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