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Diffuse idiopathic skeletal hyperostosis

Diffuse idiopathic skeletal hyperostosis (DISH) is a systemic, noninflammatory disorder characterized by the abnormal ossification of ligaments and entheses, particularly the anterior longitudinal ligament of the spine, resulting in flowing hyperostoses along the anterolateral aspects of at least four contiguous vertebral bodies, with preserved intervertebral disc spaces and absence of sacroiliac joint erosion or apophyseal joint ankylosis. First described in 1950 as "senile ankylosing hyperostosis of the spine" and later formalized as DISH in 1976, the condition primarily affects the axial skeleton, especially the thoracic spine, but can also involve peripheral entheses such as those in the pelvis, heel, and elbow. Although often asymptomatic, DISH may lead to spinal stiffness, reduced mobility, dysphagia from cervical involvement, or increased fracture risk due to vertebral rigidity. Epidemiologically, DISH prevalence increases with age, affecting approximately 12% (95% CI: 8.7-15.6%) of the general population as of a 2025 meta-analysis, with higher rates in men (about 18%) than in women (about 6%), rising to around 20% over 80 years; earlier estimates reported 6-12% overall, 25% in men and 15% in women over 50 years, and up to 28% in men and 26% in women over 80 years. It is more common in males (male-to-female ratio of about 2:1) and rare before age 50, with higher rates observed in populations with metabolic comorbidities. The etiology remains unclear but is strongly associated with metabolic syndrome components, including obesity, type 2 diabetes mellitus, hyperinsulinemia, dyslipidemia, hypertension, and hyperuricemia, though no direct causal link has been established. Pathophysiologically, it involves entheseal ossification without significant inflammation, potentially driven by biomechanical stress and metabolic factors, distinguishing it from inflammatory spondyloarthropathies like ankylosing spondylitis. Diagnosis relies on radiographic criteria established by Resnick and Niwayama, including the characteristic "candle wax dripping" appearance on lateral X-rays, with computed offering higher for early changes. Laboratory tests are typically normal, lacking inflammatory markers, and differential diagnoses include , Forestier disease variants, and seronegative spondyloarthropathies. Management is primarily symptomatic and conservative, involving nonsteroidal anti-inflammatory drugs (NSAIDs), , and lifestyle modifications to address associated metabolic risks; surgical intervention is reserved for complications such as fractures, , or severe . The is generally favorable with slow progression, though can be impacted by and comorbidities.

Overview

Definition and classification

Diffuse idiopathic skeletal hyperostosis (DISH) is a systemic, non-inflammatory skeletal disorder characterized by abnormal and of ligaments, entheses, and capsules, with a predilection for the anterolateral aspect of the spine. This condition leads to the formation of flowing ossifications that bridge contiguous vertebral bodies, resulting in spinal rigidity without significant inflammatory changes. The disorder was first described in 1950 by Jacques Forestier and Jaume Rotes-Querol as "senile ankylosing hyperostosis of the spine," highlighting its occurrence in older individuals and resemblance to ankylosing conditions. In 1976, Donald Resnick and Gen Niwayama introduced the term "diffuse idiopathic skeletal hyperostosis" to emphasize its idiopathic etiology, systemic nature, and distinction from inflammatory spondyloarthropathies, shifting focus from age-related changes to a broader pathological entity. Diagnosis relies primarily on radiographic criteria established by Resnick and Niwayama, which require the presence of flowing along the anterolateral aspect of at least four contiguous vertebral levels, preservation of height without significant vacuum phenomena or apophyseal joint , and absence of radiographic changes indicative of erosion, sclerosis, or intra-articular bony fusion. Peripheral manifestations, often termed extraspinal or peripheral , involve at sites such as the heels, , or other entheses, though these are not required for . DISH is differentiated from by the lack of inflammatory features, absence of involvement, and no association with the allele, which is strongly linked to the latter. In contrast to , DISH spares spaces without joint space narrowing or subchondral sclerosis, focusing instead on ligamentous and entheseal rather than intra-articular degeneration.

Epidemiology

Diffuse idiopathic skeletal hyperostosis (DISH) affects approximately 11.92% of the general and 14.30% of clinical patients worldwide, with estimates ranging from 10% to 30% among individuals over 50 years of age. Higher rates are observed in men, reaching up to 25% in those over 50 years compared to 15% in women of the same age group. A 2025 global meta-analysis highlighted regional variations, with at 10.07% in , 11.16% in , 13.46% in , 30.07% in , and lower rates of 3.93% in . The condition predominantly impacts individuals over 50 years, with peak incidence between 60 and 70 years and rarity before age 40; prevalence rises sharply with advancing age, from about 3% in the 50s to over 20% in the 70s. The male-to-female ratio is approximately 2:1, consistent across most populations. Geographic and ethnic patterns show DISH is more common in Western and industrialized populations, such as (11.90% prevalence), compared to Asians (10.07%) and Blacks (8.77%); associations exist with socioeconomic factors, including higher rates in affected groups. Incidence trends remain stable over time, with no significant changes correlated to publication years up to 2025, though slight increases may occur due to aging populations in many regions. At the population level, DISH exhibits strong links to , with 50-70% of patients showing comorbidities such as or in various cohorts; for instance, prevalence is notably elevated, independent of obesity.

Pathophysiology

Etiology and risk factors

The etiology of diffuse idiopathic skeletal hyperostosis () remains unknown, with no single primary cause identified; the condition is considered multifactorial, involving interactions among genetic, environmental, metabolic, and mechanical influences that promote abnormal entheseal . Unlike inflammatory spondyloarthropathies, shows no evidence of autoimmune or infectious processes, as confirmed by the absence of erosions, sclerosis, or associated positivity. Advanced age represents the strongest non-modifiable factor for , with prevalence rising markedly after age 50 and ratios increasing by approximately 1.03 per year of age. sex confers a higher , with ratios ranging from 2 to 5 across studies, leading to a male-to-female prevalence ratio of about 2:1. Among modifiable factors, (particularly BMI >30 kg/m²) is strongly associated with . mellitus elevates by 2- to 4-fold, often linked to , while , , and (including ) further contribute; is present in 70% of cases compared to 45% in controls. Familial clustering supports a , with estimated at 21.6% based on genome-wide studies. Potential genetic links include associations with HLA-B8 and loci involving morphogenetic protein-related genes such as GDF5, though no specific causal polymorphisms have been confirmed as of 2025. Environmental influences may include mechanical stress on entheses, while elevated serum insulin-like -1 (IGF-1) levels—observed in symptomatic patients—suggest a role for growth factor dysregulation potentially influenced by metabolic or dietary factors.

Disease mechanisms

Diffuse idiopathic skeletal hyperostosis () is characterized by abnormal at entheses and ligaments, driven by dysregulated formation that leads to ligamentous , where soft connective tissues undergo to form ectopic . This process primarily affects the of the spine, resulting in flowing hyperostosis along the anterolateral aspects of at least four contiguous vertebrae without involvement of the intervertebral discs or facet joints. In peripheral sites, occurs at areas of high mechanical tensile force, such as the insertion, , and entheses, contributing to the systemic nature of the condition. At the cellular level, involves heightened activity and elevated alkaline phosphatase expression, promoting excessive bone deposition. Metabolic factors, such as elevated insulin and (IGF-1) levels—often linked to conditions like —along with transforming growth factor-β (TGF-β), stimulate mesenchymal cell differentiation into bone-forming lineages and enhance ectopic . Mechanical stress at entheseal sites further activates the , as evidenced by genetic associations with genes like ROR2 and , which regulate osteogenesis and are implicated in overactive bone formation across the skeleton. Unlike inflammatory arthritides such as , lacks , erosions, or involvement, highlighting its noninflammatory, metabolic-driven pathogenesis. The whole-body distribution of ossifications in suggests underlying hormonal and metabolic dysregulation, with increased bone mineral density observed even at non-affected sites, supporting a generalized osteoproliferative state. Investigations into polymorphisms and dysregulation have not established a definitive role in DISH .

Clinical presentation

Diffuse idiopathic skeletal hyperostosis () typically presents with an insidious onset in , often after the fourth of life, and progresses gradually over decades, with symptoms generally remaining mild and non-debilitating for most patients. Many individuals are , with the condition discovered incidentally through for unrelated issues, though symptomatic cases may involve increasing spinal rigidity that worsens with age. The primary symptoms include progressive spinal stiffness, particularly in the thoracic region, accompanied by mild to moderate non-radicular that does not radiate to the limbs. Patients often experience reduced in the spine, with forward flexion commonly limited to less than 50% of normal, contributing to functional limitations such as difficulty bending. In cases of advanced involvement, large anterior osteophytes can lead to , hoarseness, or even airway compromise due to mechanical compression of the or surrounding structures. Patient-reported impacts frequently include associated with persistent stiffness, and rare episodes of acute flares, such as monoarticular , occur without evidence of underlying . Physical examination may reveal a kyphotic posture resulting in a stooped appearance from spinal rigidity, along with palpable bony bridges along the anterolateral due to flowing ossifications. Peripheral manifestations, observed in a subset of cases, include enthesophyte-related swelling or in joints such as the shoulders, elbows, knees, or , with calcaneal spurs and associated heel as common features. Symptom variation tends to emphasize axial involvement in spinal DISH, leading to predominantly back-related complaints, whereas peripheral symptoms arise from enthesopathies at extra-spinal sites and are less common but can mimic other musculoskeletal conditions.

Complications and associated conditions

Diffuse idiopathic skeletal hyperostosis () predisposes individuals to several spinal complications due to the progressive and rigidity of the . The brittle, fused spinal segments increase the risk of fractures, particularly from low-energy such as hyperextension injuries, which can result in unstable vertebral fractures and potential neurological deficits. osteophytes in may rarely cause airway obstruction through extrinsic compression of the trachea or , leading to or acute respiratory distress, while nerve root compression or involvement can result in in approximately 0.4% of cases. Extraspinal manifestations of DISH often stem from , where at ligament and tendon insertions leads to in peripheral sites, such as heel discomfort resembling due to calcaneal involvement. Additionally, hyperostotic changes around major vessels, including the , have been infrequently linked to cardiovascular complications, though these associations remain rare and require further elucidation. DISH exhibits high comorbidity with metabolic syndrome components, including diabetes mellitus and obesity, which are common in affected individuals and may exacerbate disease progression. It is also associated with elevated cardiovascular risk, with patients facing a significantly higher risk of myocardial infarction (odds ratio 6.03 in one study), independent of traditional risk factors. The condition significantly impairs quality of life through reduced spinal mobility, which heightens fall risk and contributes to locomotive dysfunction in older adults. Recent 2025 cohort studies indicate that DISH patients report lower scores on the SF-36 health survey, particularly in physical functioning and pain domains, reflecting broader limitations in daily activities. Over the long term, demonstrates slow progression, potentially leading to more diffuse spinal and worsening and fracture susceptibility in some cases.

Diagnosis

Clinical evaluation

The clinical evaluation of suspected diffuse idiopathic skeletal hyperostosis () begins with a detailed taking to identify characteristic symptoms and associated risk factors. Patients are queried about the duration and progression of axial , which is often worse in the morning and improves with activity, and the location of pain, typically involving the thoracic or rather than peripheral joints. Inquiries into metabolic are essential, as DISH is strongly associated with conditions such as diabetes mellitus, obesity, hyperlipidemia, and hypertension, which may contribute to symptom severity. Family is also assessed, given evidence of genetic predisposition, including associations with certain HLA alleles like HLA-B8. Physical examination focuses on evaluating spinal function and identifying structural changes. Spinal mobility is assessed through measurements such as the , which quantifies flexion by marking a 10 cm segment over the lumbosacral junction and measuring its expansion during forward bending; reduced expansion indicates stiffness. Posture is evaluated for or forward flexion due to rigidity, while of the spine and peripheral sites (e.g., heels, elbows) checks for tender enthesophytes or ossified ligaments. A neurological screening, including sensory and motor testing of the , is performed to detect or from . Red flags warranting urgent attention include acute worsening of back pain following minor trauma, suggesting an occult fracture in the rigid spine, or symptoms of anterior cervical involvement such as dysphagia, hoarseness, or stridor from esophageal compression by osteophytes. These findings prompt immediate imaging to rule out complications. Laboratory tests play a supportive role in excluding inflammatory mimics and screening for comorbidities. Routine blood work typically reveals normal erythrocyte sedimentation rate (ESR) and C-reactive protein (CRP) levels, consistent with DISH's noninflammatory nature, while elevated glucose or lipid profiles may confirm metabolic associations. Additional tests, such as rheumatoid factor or antinuclear antibody, are ordered if autoimmune conditions are suspected. Overall, clinical findings in evaluation often reveal mild or absent symptoms, guiding the decision to pursue for confirmation while prioritizing exclusion of differentials like ; the process emphasizes a multidisciplinary approach involving or orthopedics.

Imaging and diagnostic criteria

The diagnosis of diffuse idiopathic skeletal hyperostosis () relies primarily on radiographic , with the Resnick and Niwayama criteria serving as the gold standard for confirmation. These criteria require four key features: (1) flowing along the anterolateral aspect of at least four contiguous thoracic vertebral bodies; (2) preservation of height without significant ; (3) absence of extensive radiological changes of sacroiliac joints, such as erosion, sclerosis, or intra-articular bony fusion; and (4) absence of or significant apophyseal joint sclerosis or erosion. Plain radiographs, particularly lateral views of the , are the initial and most commonly used modality for evaluating . These images typically reveal characteristic "candle-wax dripping" or flowing hyperostosis along the , often most prominent in the thoracic (T7-T11 levels) and asymmetrically involving the right side due to aortic pulsation on the left. Extraspinal involvement may manifest as ossification at peripheral entheses, such as the , heels, or elbows, and can be assessed on anteroposterior views. Advanced imaging modalities provide supplementary detail when plain radiographs are inconclusive or complications are suspected. Computed tomography () excels in delineating the extent of , identifying subtle enthesopathies, and aiding surgical planning, with studies reporting DISH prevalence up to 27% on thoracic CT scans. Magnetic resonance imaging (MRI) is reserved for excluding inflammatory changes, , or soft tissue involvement, typically showing no abnormal signal in uncomplicated DISH. may evaluate peripheral enthesopathies, particularly in symptomatic extraspinal sites, by detecting calcific deposits or thickening. Differentiating DISH from mimics on imaging is crucial. Unlike , which features marginal syndesmophytes, , and involvement, shows non-marginal, flowing ossifications with preserved sacroiliac joints and no syndesmophytes. In contrast to , lacks significant disc space narrowing, endplate sclerosis, or posterior osteophytes, instead exhibiting continuous anterior hyperostosis without focal joint degeneration. Diagnostic challenges arise due to DISH's frequent nature, often leading to incidental detection on spinal studies performed for other indications. This high rate of subclinical findings necessitates correlation with clinical history to avoid , as early or isolated ossifications may not meet full criteria.

Management

Treatment strategies

Diffuse idiopathic skeletal hyperostosis (DISH) has no curative therapy, with management centered on symptomatic relief, preservation of function, and prevention of complications through a multidisciplinary approach involving rheumatologists, orthopedists, and endocrinologists. Conservative management forms the cornerstone of , emphasizing non-invasive strategies to alleviate , improve , and maintain . is recommended, incorporating exercises and posture-focused interventions to reduce stiffness and enhance spinal flexibility; for instance, targeted programs can significantly improve in affected patients. relief is achieved with nonsteroidal anti-inflammatory drugs (NSAIDs) such as ibuprofen at doses of 400-600 mg as needed or acetaminophen for milder symptoms, particularly effective for enthesopathy-related discomfort. counseling is advised for obese individuals to decrease mechanical stress on the and reduce symptom severity. Pharmacologic options are limited to symptom control, as no disease-modifying antirheumatic drugs (DMARDs) are approved for . NSAIDs remain first-line for inflammation and pain associated with , while bisphosphonates may be used off-label to manage symptoms and potentially slow progression, though is primarily from case series. For patients with comorbid —a common association—optimized insulin or glucose-lowering therapy is essential to mitigate metabolic contributions to disease progression. Surgical interventions are reserved for rare, severe cases where conservative measures fail, such as complications including spinal fractures requiring stabilization, from anterior cervical osteophytes necessitating resection, or instability warranting . These procedures, often involving osteophytectomy, yield favorable outcomes in restoring function like when indicated for neurological or compressive issues. Lifestyle recommendations play a key role in long-term management, promoting to address potential cardiovascular and pulmonary risks linked to DISH, a balanced , and regular low-impact exercise such as to sustain mobility without joint strain. Current approaches align with 2024-2025 consensus emphasizing empirical, symptom-driven care in a multidisciplinary framework, as no formal international guidelines exist specifically for DISH.

Diffuse idiopathic skeletal hyperostosis (DISH) is generally considered a benign condition with a slowly progressive course, allowing most patients to maintain functional independence over time. Symptoms often stabilize following an initial period of worsening, with effectively controlling pain and stiffness in the majority of cases. Progression of is influenced by factors such as early disease onset and severe metabolic comorbidities, including uncontrolled , which is associated with accelerated ligamentous and higher radiographic advancement rates. Approximately 70% of patients exhibit radiographic progression over 6 years, though only a subset develops clinically significant , estimated at 10-15% requiring mobility aids within a . DISH does not directly increase overall mortality, but it is linked to indirect risks through cardiovascular comorbidities, with affected individuals showing a 1.68-fold higher incidence of compared to controls. In cases of spinal fractures due to , conservative treatment carries a 67% , underscoring the need for vigilant management of complications. Quality of life experiences a moderate decline, particularly in physical function, as evidenced by lower SF-36 physical component scores (45.6 vs. 49.3 in non-DISH patients) and increased prevalence of locomotive syndrome stages indicating reduced mobility. Recent 2025 analyses highlight improved long-term outcomes, including better physical scores and slower progression, among those achieving early control of metabolic factors like and . Routine annual imaging is not recommended for patients; follow-up is instead guided by symptom or suspicion of complications such as fractures.

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