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Artykuł przeglądowy

Syndromes with chronic non-bacterial osteomyelitis in the spine

Łukasz Kubaszewski
,
Piotr Wojdasiewicz
,
Marcin Rożek
,
Iwona E. Słowińska
,
Katarzyna Romanowska-Próchnicka
,
Radosław Słowiński
,
Łukasz A. Poniatowski
,
Robert Gasik

Data publikacji online: 2016/02/11
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Introduction

Chronic non-bacterial osteomyelitis (CNO) occurs most often as a part of two syndromes with putative autoimmune background. Although the syndromes have been known for over 40 years, due to the limited number of cases presented in the literature and differentiated symptomatology it is not uncommon that patients are misdiagnosed, diagnosed late and receive improper treatment. Most authors present the disease as characterized by an insidious onset, though with early symptoms in the spine resembling osteomyelitis or malignant lesions [1].
Diagnosis is based mainly on the clinical picture: localized pain and moderate systemic inflammation symptoms. In biopsy, CNO may be suspected if there are non-specific inflammatory changes accompanied by dermal manifestations together with the exclusion of other possible diseases. In some cases improper diagnosis caused a prolonged ineffective antibiotic therapy or unnecessary surgical interventions [2]. Available literature referring to this particular topic is not consistent in terms of nomenclature and often presents poor practical scope for spine clinicians. Therefore, the aim of this paper is to present, based on the literature, concise and orderly information referring to the syndromes where one of the clinical manifestations is CNO in the spine.

Nomenclature and classification system problems: an overview of the most commonly used terms for non-bacterial osteomyelitis

In the literature three terms are mainly used: chronic recurrent multifocal osteomyelitis (CRMO), SAPHO syndrome and CNO. Historically, at first the term chronic recurrent multifocal osteomyelitis was coined, which is a rare non-pyogenic inflammatory bone condition with unclear etiology observed in children [3].
The syndrome, with the main manifestation of osteomyelitis is accompanied by synovitis, acne, pustulosis – especially palmoplantar (PPP) and hyperostosis (primarily attributed to the clavicle with commonly occurring symmetrical involvement) [4]. The presentations of the syndrome may vary in: different time of onset of osseous and non-osseous symptoms where time span may be up to several years, monofocal or multifocal bone involvement, and in some cases the recurrence may even be unnoticed. Therefore, a more relevant term was presented: CNO or sterile bone inflammation.
Based on the literature and according to Ferguson et al. [5], the terms CRMO and CNO mainly refer to the younger population and are often used interchangeably in pediatric literature. According to Hofmann et al.: “CNO covers a wide clinical spectrum from non- or oligo-symptomatic monofocal bony lesions to the most severe CRMO form” [6]. The SAPHO syndrome (synovitis, acne, pustulosis, hyperostosis, osteitis) is basically the same syndrome as CRMO with more regular and pronounced skin symptoms [7, 8]. The syndrome was named by Chamot et al. in 1987 [9].
In the literature the term is used mainly in older population. In some cases it is classified as a subtype of spondyloarthropathy due to sacroiliitis in some patients, as well as human leukocyte antigen B27 (HLA-B27) or human leukocyte antigen B8 (HLA-B8) were confirmed in limited cases [1, 7, 10–12]. Patients presenting SAPHO syndrome are usually adults in their 50-ties and 60-ties, or in some cases adolescents or children are included [1, 2, 7, 13]. There is no agreement whether those syndromes are the same disease with different clinical symptoms. Some authors considered them as the same entity in different age groups [14–17]. In our opinion, it is best to use the term CNO as a specific lesion being the part of both CRMO and SAPHO syndrome. In the article we separately review the literature presenting both CRMO and SAPHO syndrome with special focus on the spinal presentations of CNO.

Chronic recurrent multifocal osteomyelitis

Chronic recurrent multifocal osteomyelitis was described primarily in children and adolescents [18]. Mean age at CRMO onset is approximately 10 years, with a range of 4–14 years, mean disease duration is approximately 5 years, and the mean number of flares per patient was approximately 6 [19]. Most studies reported a predominance in female patients, which is as high as up to 85% in Scully et al. group, or female to male ratio of 5 : 1, but the majority of literature presentations contain case reports [19–21].
The etiology of most CRMO cases is not known. The episodes of systemic inflammation occur due to immune dysregulation without autoantibodies, pathogens or antigen-specific T cells [18]. The infantile onset of CRMO is connected with a genetic mutation in Majeed syndrome and the deficiency of interleukin 1 receptor antagonist (DIRA) [5].
CRMO is characterized by the non-specific onset of pain with swelling and tenderness over the affected bone or joint, worsening at night. In long bones the metaphyseal regions are affected. The most common locations of osteomyelitis are: distal femur, proximal tibia, distal tibia, and distal fibula – 34%, followed by the clavicle – 24% (historically first described and considered as classic for the syndrome), chest wall – 13%, vertebral bodies from 2 to 8%, mandible, pelvis – 14%, shoulder girdle, and small bones of the hands [14, 20, 22, 23]. The lesions may occur in any bone [18]. The syndrome may be limited to a solitary bone lesion with only long bone or mandible presentation [24, 25]. Symmetric involvement is often indicated as the characteristic trait [6]. Associated skin manifestations are: PPP, generalized pustulosis, psoriasis vulgaris and acne [5]. Laboratory tests, such as white blood cell (WBC) count, erythrocyte sedimentation rate (ESR) and tumor necrosis factor  (TNF-) levels may be mildly elevated [5].
Differential diagnosis should include acute haematogenous osteomyelitis (CRMO represents 2–5% of all osteomyelitis cases in children and adolescents), neoplasms, especially Ewing sarcoma, eosinophilic granuloma, osteoblastoma, osteoid osteoma as well as Langerhans cell histiocytosis or insufficiency fractures [11, 19, 26]. The possibility of mimicry working both ways also needs to be remembered [27]. The diagnosis is based on clinical criteria [6].

Natural history of chronic recurrent multifocal osteomyelitis

The natural history of the disease is unpredictable with varying severities and time courses, oscillating between acute exacerbations and spontaneous remission [3, 28]. As stated before, owing to the lack of a diagnostic test, CRMO is diagnosed via exclusion [29–31]. Long-term clinical outcomes for children with CRMO appear to be generally good, with most subjects having no evidence of disease activity or sequelae. However, in a number of subjects the disease is persistent and the risk of physical and psychological complications is considerable. Further research is required to identify patients at risk for persistent disease, and to determine therapies that may prevent morbidity [19]. In spite of the self-limiting character of the syndrome, in some cases it may have a prolonged course and result in significant morbidity related to bone deformation but also to unnecessary diagnostic procedures (biopsy) and treatment (prolonged antibiotic therapy, surgical debridement) [29, 31]. In most children the onset of CRMO occurs at a later age and may be concomitant with psoriasis or inflammatory bowel disease (IBD) [5]. Permanent bone deformity may also occur, particularly when vertebral bodies are involved, often leading to more aggressive treatment. In most cases CRMO is a disorder that resolves after many years, most commonly without any permanent sequelae.

Chronic recurrent multifocal osteomyelitis – associated inflammatory syndromes

Systemic inflammatory syndromes which co-exist with CRMO are: Crohn’s disease, ulcerative colitis (UC), celiac disease [5]. Other, less common syndromes include Sweet’s syndrome, dyserythropoietic anemia, pyoderma gangrenosum, sclerosing cholangitis, inflammatory arthritis, sacroiliac joint involvement, Still’s disease, Takayasu’s disease, antineutrophil cytoplasmic antibody-positive (ANCA-positive) vasculitis, Ollier disease (multiple enchondromatosis), parenchymal lung disease, dermatomyositis, and tumoral calcinosis [5].

Blood cultures and biopsy of the bone analysis in chronic recurrent multifocal osteomyelitis

Cultures of blood bone biopsy are in general negative, even with polymerase chain reaction (PCR) analysis [5]. Histopathological findings are non-specific and demonstrate lymphocyte infiltration with neutrophilic polymorphonuclear leukocytes with few plasma cells [32]. Polymorphonuclear leucocytes with osteoclasts and necrosis are observed during early stages. Subsequently, lymphocytes and plasma cells predominate followed by fibrosis and signs of reactive new bone forming around the inflammation [18]. In more detailed studies there was a predominance of CD3+, CD45RO+ T cells, which were mainly CD4+ and CD8+ with low CD20+ B cell infiltration and abundance of CD68+ monocytes or macrophages [11]. In the course of an inflammatory process reparative changes of the osseous tissue such marrow fibrosis, trabecular osteoid apposition and periosteal hyperostosis are prominent. Granulocytes are more commonly present in CRMO than in unifocal non-recurrent or in multifocal non-relapsing lesions. Hyperostosis is more commonly found in CRMO than in unifocal non-recurrent lesions.

Spinal manifestations in chronic recurrent multifocal osteomyelitis

In gene-related infantile type of CRMO the spinal involvement is observed in 60% of patients, who may have a permanent deformity of the spine, such as vertebral fusion, nonunion of the odontoid with the atlas (C1), axis (C2) subluxation, and vertebral collapse leading to gibbus deformity [33]. Non-gene-related CRMO may have a variable course. The reported locations range from the mid-cervical to the sacral spine [34]. Osteomyelitis which causes localized pain may be the cause of mild scoliosis without vertebral rotation prior to any destruction of vertebrae [26, 35]. Vertebral involvement may lead to collapse with subsequent vertebra plana or other deformities [19, 23, 29]. The typical osseous manifestations are: premature epiphyseal fusion, long bone deformity, growth arrest and progressive kyphosis [28, 35].

Radiological presentation of chronic recurrent multifocal osteomyelitis in the spine

The characteristic image includes bone oedema, lytic areas, periosteal reaction and soft tissue reaction with the possibility of the absence of periosteal reaction [6, 18]. Vertebral lesions often appear more sclerotic or osteolytic lesions with surrounding sclerosis may be present [6, 29]. The radiological feature differentiating sterile osteomyelitis from spondyloarthropathies is spondylodiscitis developing as a secondary destruction following spondylitis, although in some cases it cannot be clearly defined. The types of radiological changes observed in vertebral morphology with CNO are presented in Figures 1 and 2.
Vertebral deformity due to compression and total collapse (vertebra plana) are incidentally described in CRMO group [35, 36]. Significant deformation may ultimately lead to neurological symptoms including spinal cord compression with paralysis [32, 37]. Computed tomography (CT) has a limited role in the diagnosis of CRMO [38]. CT findings correspond to those described under radiographic assessment, with the advantage of detecting subtle bone lesions, especially in radiologically obscure sites like the sternum, spine, and pelvis. Sclerosis and periosteal reaction are also better determined with CT examination. Magnetic resonance imaging (MRI) is the most sensitive imaging modality in short tau inversion recovery (STIR) post-gadolinium T1-weighted sequence showing a pathological signal [5, 39]. MRI scans also silent asymptomatic lesions to be revealed [6].

Chronic recurrent multifocal osteomyelitis treatment in the spine

Treatment options include non-steroidal anti-inflammatory drugs (NSAIDs), steroids and bisphosphonates [18]. Biological treatment was studied in resistant cases [40]. Operative treatment is rarely indicated. It was described in a case report with decompression and realignment with bone graft and anterior plate in the upper thoracic spine [32]. In a larger study of 30 patients non-invasive treatment was necessary and good results were observed with naproxen and glucocorticoids regime [14]. In several cases good results were obtained after bisphosphonate administration with the complete resolution of lesions in MRI studies [39, 41].

SAPHO syndrome

SAPHO syndrome occurs in middle-aged adults [1, 5]. Nevertheless, some authors include CRMO as a part of SAPHO syndrome. Therefore, age span may be respectively wider. The key symptoms are: synovitis (with affected joint swelling and limitation of movement), acne, pustulosis (most often the PPP form), hyperostosis and osteitis. There is a number of diagnostic criteria for SAPHO syndrome, but it is worth to notice that criteria made by Kahn (modified in 2003) seem to be the most precise (Table I) [42].
Not all the symptoms are concomitant, so not all are required for making a diagnosis, although linking PPP with osteitis is considered a strong diagnostic criterion [42]. The most commonly affected site in the skeleton is the anterior chest (with frequently observed sternocostoclavicular hyperostosis), followed by the spine [6]. According to some authors, the spine is one of the most commonly affected sites with the incidence ranging from 32% to 52% [7, 10, 43]. The interval separating the onset of the symptoms and the diagnosis of SAPHO syndrome may be similar to the one in CRMO, i.e. approximately 6 or 9 years [1, 10]. It is the most common in cases where a cutaneous lesion appears a long time after the onset of an osteoarticular lesion, or if skin problems do not appear at all [2]. In extreme cases this period may be 20-year long [44]. Generally, in 50% of cases the vertebral and thoracic lesions preceded skin symptoms [7]. The clinical course of SAPHO syndrome often fluctuates between periods of recovery and deterioration [42].
Differential diagnosis includes infectious diseases, primary and metastatic tumours, diffuse idiopathic skeletal hyperostosis or retinoid therapy causing osseous deformity, osteosarcoma, Paget’s disease, and POEMS (polyneuropathy, organomegaly, endocrinopathy, monoclonal gammopathy, and skin changes) syndrome [1]. In some cases the Propionibacterium acne was cultured with a possible indication on an infectious background of the syndrome [45–47]. However, recently the presence of the bacteria has been confirmed in other changes related to the degenerative process of the intervertebral disc [48, 49]. Linking the species with either condition is controversial and its presence in both groups should be considered a co-occurrence rather than etiological factor [50].

Natural history of SAPHO syndrome

Spinal lesions in SAPHO syndrome are generally connected with a good prognosis. In some cases the vertebral destruction may cause a deformity and neurological problems, ultimately including paralysis resulting in a surgical intervention [1].

Histopathological examination in SAPHO syndrome

The histopathological examination of bone biopsy shows: specific granulation tissue with significant infiltration of, mostly lymphocytic, small round cells consistent with osteomyelitis, and plasmacytes, small round cell infiltrations, derangement of bony trabeculae and moderately increased osteoid, replacement of bone by fibrous tissue picture of chronic osteomyelitis with cellular infiltrate composed of lymphocytes and polymorphonuclear leucocytes, areas of microabscesses, no specific lesions or inflammatory cells, especially in the disk space [7, 12]. In operative field spinal changes are fragile, resembling rheumatoid arthritis but including some sclerotic areas.

Spinal presentation in SAPHO syndrome

The spinal symptoms in SAPHO syndrome may be of great variety. The most common symptoms include low back pain and deep palpation tenderness, numbness and radial pain and sciatica, Lasègue’s sign [2, 7, 12]. Sacroiliitis is observed in 13–52% of cases [7]. There are rare cases of quadriplegia due to the destruction of vertebrae followed by spinal cord compression. In some cases no neurological symptoms are observed [7]. Spinal lesions in SAPHO syndrome are common with variable occurrence in different studies: 15.7%, 32% and 52% [7, 9, 43]. The mean age of the patients ranges from 47 to 51 years [12, 42]. Observations of few cases of spinal manifestations showed the prevalence of females among patients: 66.6% and 92% [1, 12]. The interval between the initial symptoms and diagnosis is 6.4 years [1]. There is usually a uniform distribution of occurrence in the whole spine with the minority of patients with one region of the spine affected [7]. In a group of eight patients three patients had cervical spine involvement, two patients – cervical and thoracic spine involvement, one patient – cervical, thoracic and lumbar spine involvement, three patients – cervical and lumbar spine involvement and four patients – thoracic and lumbar involvement [1].

Radiological presentation of the SAPHO syndrome in the spine

The radiological presentation of spondylodiscitis in SAPHO syndrome includes a spectrum of changes from mild fragmentary end-plate destruction to whole vertebra destruction and remodeling (Fig. 3). Vertebral lesions may begin in the end-plates as destructive, erosive and sclerotic remodeling, but it may also start at the vertebral body, with disc space preservation, or spread to the disc with its narrowing [7, 51]. It was hypothesized, that enthesitis leads to osteolysis, erosion, synovitis, hyperostosis, with synostosis and ankylosis [43]. Another radiological analysis pointed out vertebral corner erosion as the primary change in MRI examination [52]. Multiple sites of spondylodiscitis (Fig. 4) in the same patient facilitate distinguishing the disease from infectious spondylodiscitis [7].
Severe destruction may lead to a kyphotic deformity with neurological complications. Slowly progressive non-marginal syndesmophytes at multi-spinal levels or a non-specific osteophyte pattern, which is characteristic for psoriatic spondylitis are observed in SAPHO syndrome [1]. Non-marginal syndesmophytes do not develop from the vertebral angle but from the middle of one vertebral body and extend to the same area of the adjacent vertebra [53]. A strong tendency towards ossification with the ultimate formation of ankylosing spinal hyperostosis is observed in advanced stages.
In some cases the presentation may resemble diffuse idiopathic skeletal hyperostosis (DISH) syndrome [12]. Diffuse idiopathic skeletal hyperostosis commonly causes the ossification of the posterior longitudinal ligament and ligamentum flavum, with common secondary neurological symptoms, without the evidence of inflammatory changes observed in MRI examination. According to Courtois et al. [54] the vertebral end-plate changes are similar to those observed in CRMO. CT examination does not always show lesions typical for osteomyelitis and may be interpreted as degenerative [2]. It usually shows erosive lesions with no abscess [7]. In MRI examination abnormal signal intensity was most frequently noted in the vertebral end-plate with low-intensity in T1 and high-intensity in T2 images, enhanced after an injection of gadolinium with the sole involvement of vertebral bodies or together with the disk, depending on the extent of the lesion [7]. Non-consecutive, multi-level (more than three) spinal lesions were observed in 38% of cases [1]. Abscesses and epiduritis, typical for infectious spondylodiscitis, were not observed on MRI scans. The follow up MRI usually showed no complications such as recurrences, or new location of spondylodiscitis. Studies usually show remodeling sequelae of spondylodiscitis [7]. The first differential diagnosis in SAPHO syndrome, based on MRI scans, may be one of multi-metastatic lesion due to the age of patients [55].

SAPHO syndrome treatment

Antimicrobial therapy is usually ineffective [42, 56]. NSAID treatment is sufficient in most cases [7, 57, 58]. Systemic corticosteroids are used in unresponsive patients. According to the literature, successful treatment with sulphasalazine, colchicine, methotrexate, minocycline and biological treatment with anti-TNF therapy and even anti-interleukin-1 was conducted. Biological drugs have been used in selected cases [59–61]. Ultimately, surgical treatment is necessary [12]. The operative treatment rate is from 0 to 44% [7, 12]. Decisions for operative treatment were based mainly on neurological symptomatology with the goal to restore stability [12]. The authors stated: “When the vertebral lesion is acute and rapidly progressive, surgical intervention is recommended to diminish the cutaneous presentation and regain spinal stability” and “surgery is indicated only if the lesion shows progressive osteomyelitic changes associated with significant cutaneous and spinal symptoms” [12]. Some interventions described were performed for the potential decompression and drainage of suppurative spondylodiscitis with no confirmation of typical osteomyelitic changes at the site [2]. The results of the operative treatment are positive with good incorporation of autologous bone graft reinforced with metal implants.

Summary

The above literature review of both CRMO and SAPHO syndrome shows similar clinical presentations, especially as regards CNO in the spine. The similarities includes the predominance of female patients, and the clinical and histological presentation. Spinal involvement and “penetrance” in both age groups seems to be comparable with more extensive neurological symptomatology presented in the literature in the SAPHO syndrome group. This, in turn, may be ground for a higher number of surgical interventions in SAPHO syndrome patients. Despite the lack of reliable epidemiological studies, the number of CNO cases in the spine presented with the background of CRMO and SAPHO syndrome seems to be a noticeable medical problem. The concern is mainly about the diagnostic stage. An erroneous suspicion of the microbial etiology of the lesion may result in unnecessary treatment not influencing the course of the disease. Therefore, radiologists and clinicians need to be aware of its clinical and imaging presentation to avoid morbidity associated with improper treatment.

The authors declare no conflict of interest.

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Copyright: © 2016 Narodowy Instytut Geriatrii, Reumatologii i Rehabilitacji w Warszawie. This is an Open Access article distributed under the terms of the Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0) License (http://creativecommons.org/licenses/by-nc-sa/4.0/), allowing third parties to copy and redistribute the material in any medium or format and to remix, transform, and build upon the material, provided the original work is properly cited and states its license.




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