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Review

Imaging in the Assessment of Musculoskeletal Manifestations Associated with Inflammatory Bowel Disease

by
Andrea Becciolini
*,
Eleonora Di Donato
,
Gianluca Lucchini
,
Daniele Santilli
,
Flavio Mozzani
,
Michele Riva
and
Alarico Ariani
Unit of Internal Medicine and Rheumatology, Department of Medicine, Azienda Ospedaliero-Universitaria di Parma, 43126 Parma, Italy
*
Author to whom correspondence should be addressed.
Gastroenterol. Insights 2021, 12(1), 100-110; https://doi.org/10.3390/gastroent12010010
Submission received: 2 February 2021 / Revised: 12 March 2021 / Accepted: 18 March 2021 / Published: 21 March 2021
(This article belongs to the Section Gastrointestinal Disease)
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Abstract

:
Extraintestinal manifestations are the cause of morbidity and affect the quality of life of patients with inflammatory bowel diseases (IBDs). Musculoskeletal manifestations, in particular, spondyloarthritis and osteoporosis, are the most frequent extraintestinal manifestation of IBDs. The diagnosis and management of the musculoskeletal manifestation of IBDs relies on imaging. Conventional radiography, magnetic resonance imaging, computed tomography, and ultrasound can help to detect pathological signs of spondyloarthritis, both peripheral and with axial involvement. Dual-energy X-ray absorptiometry is the gold standard for identifying the presence of osteoporosis, whereas conventional radiology and computed tomography can reveal occult vertebral fractures. The aim of this narrative review is to describe the imaging of musculoskeletal manifestations of IBDs.

1. Introduction

Inflammatory bowel diseases (IBDs), a term encompassing ulcerative colitis (UC) and Crohn’s disease (CD), affect more than 2 million people in Europe [1]. Extraintestinal manifestations of IBDs are very frequent since more than up to 50% of patients could experience one [2]. Musculoskeletal manifestations are the most frequent extraintestinal complications of IBDs, and they are an important cause of morbidity and impairment of quality of life [3]. The association between IBD and arthritis has been reported since 1960s [4]; on the other hand, the concept of spondyloarthritis (SpA) and the understanding of its spectrum disorders has significantly advanced only in the last two decades [5]. The most frequent rheumatic manifestations among patients with IBDs are sacroiliitis (from to 2–32%); peripheral arthritis, that can be further classified as oligoarticular with large joint involvement (type 1) and bilateral symmetrical polyarthritis (type 2) (from 7–16%); enthesitis (from 1–54%); and dactylitis (from 2–4%) [6]. Axial involvement has been reported more frequently among patients with CD (5–22%) than in those with UC (2–6%); on the other hand, there was no association with IBD disease activity [7]. Type 1 peripheral arthritis affects mainly CD patients with a colonic localization and is strongly associated with other extraintestinal manifestations (such as erythema nodosum and uveitis) and disease activity [6]. Furthermore, osteoporosis affects about 24% of IBD patients [8]. Table 1 summarizes the musculoskeletal manifestations of IBDs.
The main purpose of this narrative review is to describe the imaging of musculoskeletal manifestations of IBDs.

2. Imaging in the Assessment of Inflammatory Musculoskeletal Manifestations

Imaging has a pivotal role in the assessment of inflammatory musculoskeletal manifestations of IBDs. The use of noninvasive and reproducible techniques, such as ultrasound (US), magnetic resonance imaging (MRI), computed tomography (CT), and conventional radiography, can help the clinician to detect early pathological manifestation in order to achieve a correct diagnosis and treat the patient accordingly. The structures involved in inflammatory musculoskeletal manifestations of IBDs are peripheral and axial joints, vertebral bodies, tendons, and entheses. Joint inflammation is characterized by synovitis and subchondral osteitis that can lead to erosion, new bone formation, sclerosis and, in the case of sacroiliac joints, to ankylosis. Similarly, vertebral body inflammation, characterized by subchondral osteitis, can lead to erosion, sclerosis, and syndesmophytes. Tendon with sheath inflammation is characterized by tenosynovitis. Enthesis inflammation is characterized by insertional tendon thickening, neoangiogenesis, and bursitis that can lead to erosion and new bone formation [9]. Table 2 summarizes the role of imaging techniques in the assessment of inflammatory musculoskeletal manifestations of IBDs.

2.1. Conventional Radiography

Conventional radiography of joints, spine, and pelvis is useful for the assessment of baseline structural changes in patients with SpA. On the other hand, conventional radiography usually depicts later stage modifications and its use could be limited in young patients or in those with short symptom duration [9].

2.1.1. Sacroiliac Joints

Sacroiliac joints signs of SpA include sclerosis, erosions, and ankylosing and can be classified, according to the New York criteria, as grade 0 (normal), grade 1 (suspicious changes), grade 2 (minimum abnormality—small localized areas with erosion or sclerosis without alteration in the joint width), grade 3 (unequivocal abnormality—moderate or advanced sacroiliitis with erosions, evidence of sclerosis, widening, narrowing, or partial ankylosis), and grade 4 (severe abnormality—total ankylosis) [10]. Among patients with IBDs, radiological sacroiliitis has been reported in 20–50% of cases [11,12,13,14]. Interestingly, radiographic sacroiliitis can be asymptomatic. Bandinelli et al., in a series of 81 IBD patients without clinical musculoskeletal manifestations, reported that conventional radiography of pelvis showed sacroiliac abnormalities in 22 cases, of which 4 developed inflammatory back pain and active sacroiliitis on MRI during 3 years of follow-up [15].

2.1.2. Spine

Typical radiographic spine signs are the squaring of vertebral bodies followed by sclerosis and erosion of the anterior and posterior edges of the vertebral endplates (Romanus lesions) and, finally, the formation of vertebral body fusion by marginal syndesmophytes (“bamboo spine”). The involvement of the spine can be quantified with the modified Stokes Ankylosing Spondylitis Spine Score (mSASSS), a validated scoring system that can assess the progression of disease over time [16].
Spinal involvement, with evidence of syndesmophytes, have been reported in 1–10% of patients with IBDs [7,17,18,19].

2.1.3. Peripheral Joints

Radiography of peripheral joints can demonstrate soft tissue swelling, erosions, and new bone formation. However, none of the radiographic signs are pathognomonic of arthritis due to IBDs. The radiograph of entheses can detect enthesophytes (i.e., abnormal bony spurs at the attachment of the tendon onto bone) and erosions, even if those are usually present only in late-stage disease [19].

2.2. Magnetic Resonance Imaging

In the last few decades, the gold standard imaging modality for assessing inflammatory (synovitis, tenosynovitis, enthesitis, and bone marrow edema) and structural (bone erosion, new bone formation, sclerosis, and fat infiltration) changes of joints, tendons, and spine is MRI [9,20].

2.2.1. Sacroiliac Joint

According to Assessment of SpondyloArthritis International Society (ASAS) MRI working group [21], typical sacroiliac joint inflammatory findings in SpA include osteitis/bone marrow edema (defined as hypointense signal on T1-weighted images and hyperintense signal on T2-weighted and short tau inversion recovery (STIR) sequences), enthesitis (defined as enthesis thickness and hyperintense signal on T2-weighted and STIR images that can be associated with peri-entheseal soft tissues swelling or edema and adjacent bone marrow edema), capsulitis (defined as thickening of the joint capsule and ligaments associated with a hyperintense signal on T2-weighted or STIR images) and synovitis (defined as hyperintense signal on contrast-enhanced T1-weighted images with fat saturation). MRI can also depict structural damage due to previous inflammation such as subchondral/periarticular erosions, periarticular fat deposition, bony bridges, ankylosis, and subchondral sclerosis. The use of paramagnetic gadolinium as a contrast agent is necessary for detecting sacroiliac synovitis and could help identifying enthesitis and capsulitis; moreover, it can help to distinguish septic and neoplastic alterations [22]. According to ASAS criteria for diagnosis of active sacroiliitis, MRI must depict bone marrow edema on STIR in the subchondral bone marrow (Figure 1), and the presence of any other inflammatory or structural lesion is not mandatory [21].
Some studies have reported the prevalence of sacroiliitis among patients with IBDs. A monocentric retrospective French study involving 186 IBD patients undergoing MRI enterography or colonography highlighted a prevalence of 16.7% of sacroiliitis, which was bilateral in 14 cases and unilateral in 17 [23]. A similar monocentric retrospective study involving 286 IBD patients revealed the presence of sacroiliitis in 26 (9.1%) on MRI enterography [24]. A cross-sectional study among 120 Indian IBD patients with sacroiliac involvement by MRI has been depicted in 20% of cases, three of whom were asymptomatic [25]. Among 44 CD patients with disease duration of 5 to 12 years undergoing pelvis MRI, sacroiliitis was reported in 17 (39%), 5 of whom had SpA [26]. More recently, a multicentric retrospective Italian study included 894 IBD patients undergoing MRI or CT enterography highlighted the presence of sacroiliitis in 129 cases (16.4%, of which 89 were from MRI examinations). Interestingly sacroiliac joint alterations were not reported in the majority of examinations (112 [86%], 78 by MRI) [27]. A pilot study involving 11 IBD patients with arthralgia analyzed by hand MRI revealed, in two cases, the presence of enthesitis [28].

2.2.2. Spine

At the level of the spine, active lesions are characterized by small hypointense T1-weighted and hyperintense T2- and STIR-weighted sequences of the vertebral body corners or plates. Chronic spine lesions are characterized by areas of fatty bone marrow replacement that appear hyperintense in T1 and T2 MRI sequences at the vertebral body corners or plates. Sclerosis, new bone formation, and ankylosis, characterized by low-intensity signals on all MRI sequences, can be identified in later stages [9,20].

2.2.3. Entheses and Tendons

Entheses can be assessed with MRI and is especially useful in the early inflammatory phase showing the presence of thickening that appears hyperintense on T2- and hypointense on T1-weighted images, with peri-entheseal swelling, insertional bone edema, bursitis, and erosions. However, alterations detected by MRI could also be found in non-inflammatory diseases such as mechanical induced enthesopathy [9,29]. The hallmark of dactylitis in MRI evaluation are flexor tenosynovitis, extensor tenonitis/paratendinitis, subcutaneous edema and, less frequently, distention of finger joint capsule [9,20].

2.3. Computed Tomography

CT can provide very detailed information about structural alterations of bone such as erosion, sclerosis, and ankylosis (Figure 2) [30]. However, differently from MRI, it cannot determine whether the disease is active or not. Furthermore, alterations such as sclerosis could be secondary to disease, different from SpA such as osteitis condensans ilii and diffuse idiopathic skeletal hyperostosis [20].
Since several patients with IBDs undergo CT enterography as part of their clinical workout, it is possible to use this examination for diagnosing SpA.
Many studies have reported the prevalence of sacroiliitis in CT. In a cross-sectional study of 65 IBD patients, CT revealed the presence of asymptomatic sacroiliitis in 21 (32%) cases [31]. A similar study of 86 patients with CD sacroiliitis was shown by CT in 25 (29%) [32]. In the Gotler et al. study, a subset of 137 IBD patients underwent CT enterography that highlighted signs of sacroiliitis in 34 (25%) [24]. An observational study evaluating abdominal CT among 163 Korean IBD patients revealed the presence of sacroiliitis in 27 (16.6%) cases (10/82 [12.2%] in UC and 17/81 [21%] in CD) [33]. A further analysis of the study of Leclerc-Jacobs et al. [23] included 51 IBD patients that also underwent abdominal CT, confirming sacroiliitis in 12 (23.5%) cases, of which 6 had inflammatory low back pain [34]. A retrospective analysis of CT enterography in 221 CD patients revealed sacroiliitis in 53 (24%) cases [35]. Among 80 patients with the same disease undergoing abdominal CT, signs of sacroiliitis were found in 27 (33.8%), more frequently in subjects with inflammatory back pain (19/40) than in those without (8/40) [36]. Interestingly, sacroiliitis was revealed in 4 cases among a control group of 40 patients without IBDs and inflammatory back pain. Finally, a recent large retrospective study of 317 IBD patients undergoing abdominal CT identified 49 (16%) cases with sacroiliitis [37].

2.4. Ultrasound

US is a noninvasive, reproducible technique that is widely diffused in current rheumatology practice. Differently from MRI, ASAS does not include US in the classification criteria for SpA; however, it a very useful technique that can allow real-time recognition of even asymptomatic structural and inflammatory abnormalities of joints, tendon, and entheses, especially in early phases [38]. On the other hand, the main disadvantages of US are represented by its operator dependent nature and the relatively long learning curve.

2.4.1. Peripheral Joints

The main joint alterations that can be depicted by gray-scale US examinations are effusion, synovial hypertrophy, bone erosions, and new bone formation. On top of that, the use of US with color and power Doppler can reveal synovial neoangiogenesis, an indicator of inflammation that can be applied in diagnosis and follow-up of SpA in clinical practice [39]. Joint US scoring methods are inherited by rheumatoid arthritis [40].

2.4.2. Entheses and Tendons

Gray-scale US tendon examination can depict alterations such as loss of fibrillar echogenicity, hypoechoic thickening, bone erosions, or new bone formations. For tendons with sheath, tenosynovial effusion and hypertrophy can be highlighted. US with color and power Doppler can reveal synovial and entheseal neoangiogenesis [39]. Dactylitis, that is, tenosynovitis of the fingers and toes characteristic of SpA, and enthesitis can be depicted by US (Figure 3). Entheses US scoring methods such as the Glasgow ultrasound enthesitis scoring system (GUESS) [41] or the Madrid sonography enthesitis index (MASEI) [42] have been developed.
Different studies have evaluated the role of ultrasound in detecting US entheseal abnormalities among IBD patients. An Italian cross-sectional study involving 81 IBD patients without musculoskeletal symptoms revealed gray-scale lower limb entheseal alterations in 71 (92.6%) cases and a positive power Doppler in 13 (16%) [43]. A multicenter cross-sectional study of IBDs 76 patients highlighted that 64 (84.1%) had at least one gray-scale entheseal alteration, 11 (13.9%) one entheseal positive power Doppler, and 32 (42.1%) sub-clinical joint involvement [44]. A Turkish monocentric cross-sectional study including 43 IBDs, 44 celiac patients and 18 healthy controls found higher entheseal gray-scale and power Doppler US alterations in the two pathological groups [45]. Since fibromyalgia, a condition characterized by widespread non-inflammatory pain, could be associated with IBDs the value of US has been assessed in this setting. A recent multicenter cross-sectional study found that patients with IBDs and SpA had higher MASEI score than those with IBDs and fibromyalgia [46]. Finally, a multicenter cross-sectional study including 148 IBD patients revealed gray-scale entheseal involvement in 87.8% of cases, with positive entheseal power Doppler in 29.7% [47].

3. Imaging in the Assessment of Non-Inflammatory Musculoskeletal Manifestation

Patients with IBD have an increased risk of developing osteopenia and osteoporosis, respectively defined by the World Health Organization as between −1 to −2.5 and less than or equal to −2.5 standard deviation bone mineral density than the general population (T-score) by dual-energy X-ray absorptiometry (DEXA). Factors involved in development of osteoporosis among patients with IBDs are usually related to chronic inflammation, cumulative corticosteroid dose, disease duration, age, diffuse bowel disease or ileal resection, alcohol consumption, smoking, low physical activity, low calcium intake, and sarcopenia [48]. Osteoporosis is a silent disease because no signs or symptoms are associated with bone loss. Furthermore, almost two-thirds of vertebral fractures, the most frequent complication of osteoporosis, are not symptomatic (Figure 4) [49].
On the other hand, femoral fracture could be associated with mortality up to 10% at one month and up to 30% at one year [50]; therefore, osteoporosis screening and treatment is mandatory.
Among IBD patients, a prevalence of osteopenia ranging from 32 to 50% and of osteoporosis from 5 to 37% have been reported in several studies [8,51,52,53,54]. Interestingly, Reffitt et al. [55] have observed that bone mineral density improves with long-lasting stable remission; IBDs, however, appear to be associated with vertebral fractures independently of DEXA values [56]. In particular, IBD patients have a significantly higher risk of vertebral fractures, but not that of other sites, when compared to healthy controls (OR = 2.26, 95% CI 1.04–4.09) [57]. Abdominal CT obtained for other indications could be used to measure lumbar spine bone mineral density [58] and is also capable of clearly identifying vertebral fractures.

4. Conclusions

Musculoskeletal manifestations in IBDs have a high impact on disease burden. The different imaging modalities complete the clinical examination and anamnesis, allowing a better recognition of extraintestinal manifestations. On suspicion of axial SpA involvement, besides conventional spine and pelvic radiography that can reveal late-stage structural changes, MRI is the gold standard to assess active and chronic alteration. Given that IBD patients frequently undergo MRI or CT enterography or colonography these exams could properly identify the presence of an occult SpA. When a peripheral joint, tendon, or entheseal SpA involvement is suspected, a US should be performed since it is a reliable bedside technique that allows the detection of early structural and inflammatory alterations. IBD patients have an increased risk of developing osteopenia and osteoporosis and a DEXA should therefore be carried out in order to identify and treat this non-inflammatory musculoskeletal manifestation. Finally, abdominal CT scan, often performed in IBD patients, can be used for vertebral fracture screening and assessment.

Author Contributions

Conceptualization, A.B., E.D.D. and A.A.; literature review, E.D.D., D.S. and M.R.; writing—original draft preparation, A.B., E.D.D. and G.L.; writing—review and editing, F.M., D.S. and A.A.; visualization, G.L., F.M. and D.S.; supervision, M.R. and A.A. All authors have read and agreed to the published version of the manuscript.

Funding

This research received no external funding.

Institutional Review Board Statement

Not applicable.

Informed Consent Statement

Not applicable.

Conflicts of Interest

The authors declare no conflict of interest.

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Figure 1. Axial short tau inversion recovery (STIR) sequence MRI of the sacroiliac joints. (A) Normal sacroiliac joints. (B) Subchondral bone marrow hyperintensities involving both iliac and sacral bones on the left side (arrows).
Figure 1. Axial short tau inversion recovery (STIR) sequence MRI of the sacroiliac joints. (A) Normal sacroiliac joints. (B) Subchondral bone marrow hyperintensities involving both iliac and sacral bones on the left side (arrows).
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Figure 2. Axial CT image of the sacroiliac joints. (A) Normal sacroiliac joints. (B) Structural changes of sacroiliac joints: bilateral erosions (arrows) and bone sclerosis (arrowheads).
Figure 2. Axial CT image of the sacroiliac joints. (A) Normal sacroiliac joints. (B) Structural changes of sacroiliac joints: bilateral erosions (arrows) and bone sclerosis (arrowheads).
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Figure 3. Ultrasound examinations. (A) Normal Achilles tendon (t) insertion on the calcaneus (c). (B) Achilles enthesitis characterized by tendon hypoechogenicity (*), hypervascularization (°), erosion (+), and deep retrocalcaneal bursitis (§). (C) Normal flexor tendons (t) of the II finger. (D) Dactylitis characterized by tenosynovitis (*), hypervascularization (°), and swelling of the subcutaneous tissue (+).
Figure 3. Ultrasound examinations. (A) Normal Achilles tendon (t) insertion on the calcaneus (c). (B) Achilles enthesitis characterized by tendon hypoechogenicity (*), hypervascularization (°), erosion (+), and deep retrocalcaneal bursitis (§). (C) Normal flexor tendons (t) of the II finger. (D) Dactylitis characterized by tenosynovitis (*), hypervascularization (°), and swelling of the subcutaneous tissue (+).
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Figure 4. Conventional radiography of the spine. (A) Normal dorsal vertebrae. (B) Fracture of the 9th and 10th dorsal vertebrae (arrowheads).
Figure 4. Conventional radiography of the spine. (A) Normal dorsal vertebrae. (B) Fracture of the 9th and 10th dorsal vertebrae (arrowheads).
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Table
Table 1. Musculoskeletal manifestations of inflammatory bowel diseases (IBDs).
Table 1. Musculoskeletal manifestations of inflammatory bowel diseases (IBDs).
Clinical FeaturesAffected Sites
Peripheral arthritis
Type 1
  • Acute and self-limiting attacks of joint pain and swelling
  • Usually associated with other extraintesinal manifestations and IBDs exacerbation
  • Last less than 10 weeks
  • No permanent articular damage
  • Oligoarticular (less than 5 joints) asymmetric involvement that prevalently affects large weight-bearing joints
Type 2
  • Chronic joint pain and swelling
  • Persistent (months to years)
  • Usually associated with other extraintestinal manifestations
  • Polyarticular symmetric involvement that prevalently affect small joints
Enthesitis
  • Pain and swelling affecting the insertion of tendons or ligaments into bones
  • Usually affects weight bearing entheses
Dactylitis
  • Pain and diffuse swelling (sausage-like) affecting fingers or toes
  • Fingers and/or toes
Axial involvement
  • Inflammatory back pain associated with morning stiffness
  • Sacroiliac joints and/or the spine
Osteoporotic fracture
  • Pain at the affected bone (can be asymptomatic)
  • Any bone (in particular hip and vertebrae)
Table
Table 2. Imaging techniques in the assessment of inflammatory musculoskeletal manifestations of IBDs.
Table 2. Imaging techniques in the assessment of inflammatory musculoskeletal manifestations of IBDs.
Imaging TechniquesStructures AssessedPathological FindingsAdvantagesDisadvantages
Conventional radiographyPeripheral joints
Axial joints
Vertebral bodies
Entheses		Erosion, vertebral syndesmophyte, sclerosis, ankylosis, new bone formationLow cost, reference technique, short testing time, wide availability, baseline assessmentIonizing radiation, limited in detection of inflammatory lesions, low sensitivity
Magnetic resonance imagingPeripheral joints
Axial joints
Vertebral bodies
Tendon
Entheses		Bone marrow edema, synovitis, tenosynovitis, enthesitis, bursitis, erosionSensitive, no radiation burden, high spatial resolution, excellent soft tissue visualizationHigh cost, limited availability, long scanning time, not dynamic, contraindicated in patients with metallic implants
Computed tomographyPeripheral joints
Axial joints
Vertebral bodies
Tendon 		Erosion, vertebral syndesmophyte, sclerosis, ankylosis, new bone formationSensitive, high spatial resolutionHigh cost, limited availability, ionizing radiation, no detection of inflammatory lesions
UltrasoundPeripheral joints
Tendon
Entheses		Synovitis, tenosynovitis, enthesitis, erosion, new bone formationSensitive, no radiation burden, high spatial resolution, excellent soft tissue visualization, short testing time, bedside procedureLimited acoustic windows, operator dependency, long learning curve
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Becciolini, A.; Di Donato, E.; Lucchini, G.; Santilli, D.; Mozzani, F.; Riva, M.; Ariani, A. Imaging in the Assessment of Musculoskeletal Manifestations Associated with Inflammatory Bowel Disease. Gastroenterol. Insights 2021, 12, 100-110. https://doi.org/10.3390/gastroent12010010

AMA Style

Becciolini A, Di Donato E, Lucchini G, Santilli D, Mozzani F, Riva M, Ariani A. Imaging in the Assessment of Musculoskeletal Manifestations Associated with Inflammatory Bowel Disease. Gastroenterology Insights. 2021; 12(1):100-110. https://doi.org/10.3390/gastroent12010010

Chicago/Turabian Style

Becciolini, Andrea, Eleonora Di Donato, Gianluca Lucchini, Daniele Santilli, Flavio Mozzani, Michele Riva, and Alarico Ariani. 2021. "Imaging in the Assessment of Musculoskeletal Manifestations Associated with Inflammatory Bowel Disease" Gastroenterology Insights 12, no. 1: 100-110. https://doi.org/10.3390/gastroent12010010

APA Style

Becciolini, A., Di Donato, E., Lucchini, G., Santilli, D., Mozzani, F., Riva, M., & Ariani, A. (2021). Imaging in the Assessment of Musculoskeletal Manifestations Associated with Inflammatory Bowel Disease. Gastroenterology Insights, 12(1), 100-110. https://doi.org/10.3390/gastroent12010010

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