DISH (Diffuse Idiopathic Skeletal Hyperostosis)
DISH (Diffuse Idiopathic Skeletal Hyperostosis)
DISH is a bone-forming condition that can make the spine and some tendon attachment points increasingly stiff. Treatment focuses on maintaining movement, strength, balance and everyday function while identifying symptoms that need medical review.
Quick answer
DISH, short for diffuse idiopathic skeletal hyperostosis, causes ligaments and tendon attachment points to gradually calcify and form extra bone. It most commonly affects the spine. Some people have few symptoms, while others develop marked stiffness, reduced movement, posture changes or pain around the spine and other attachment points.
Physiotherapy cannot remove the extra bone. However, an individual program may help maintain movement, strength, balance, walking tolerance and day-to-day independence.
DISH at a glance
Typical pattern
Spinal stiffness is often more noticeable than sharp or severe pain.
Common areas
DISH may affect the neck, thoracic spine, lower back and tendon attachment points around the shoulders, hips, knees and heels.
Important distinction
DISH is different from ankylosing spondylitis and ordinary osteoarthritis, although symptoms and imaging findings can overlap.
What is DISH?
DISH is a systemic bone-forming condition. It causes calcification and ossification where some ligaments and tendons attach to bone. The front and sides of the thoracic spine are commonly affected.
Over time, flowing bridges of bone may develop across several vertebrae. These changes can reduce movement between spinal segments and make the spine more rigid.
The appearance on an X-ray or CT scan does not always match the severity of symptoms. Some people have extensive changes with little discomfort. Others experience substantial stiffness, restricted movement or disability.
DISH may be considered alongside other arthritis-related conditions and broader causes of back pain, although it has its own characteristic imaging pattern.
Common symptoms of DISH
Symptoms usually develop gradually. People often report stiffness after rest, difficulty straightening after sitting or reduced movement when turning, bending or looking over the shoulder.
Spinal symptoms
- Neck, mid-back or lower-back stiffness
- Reduced spinal rotation or extension
- Difficulty standing fully upright
- Aching during prolonged standing or walking
- Reduced ability to turn when driving
Symptoms outside the spine
- Shoulder or hip attachment-point pain
- Knee discomfort or stiffness
- Heel pain around the Achilles tendon or plantar fascia
- Rib or chest-wall stiffness
- Reduced overhead or reaching movement
Symptoms may also come from nearby muscles, joints or nerves rather than DISH itself. For example, DISH can exist alongside spondylosis, spinal stenosis or osteoarthritis.
Why does DISH cause stiffness?
Healthy spinal segments move in small amounts during bending, turning and straightening. DISH can reduce this movement when bone develops along tissues that would normally remain more flexible.
The remaining mobile areas may then take more of the movement and physical load. Muscles can also become less conditioned when stiffness leads to reduced activity. Together, these factors may contribute to pain, fatigue, balance problems or reduced walking tolerance.
Clinical perspective
Not every symptom in a person with DISH comes directly from the visible bony changes. A useful assessment considers the spine, hips, shoulders, muscles, nerves, balance, general health and the activities that provoke symptoms.
What causes DISH?
The exact cause remains uncertain. DISH becomes more common with increasing age and has associations with several metabolic and cardiovascular health factors.
Factors associated with DISH include:
- Increasing age
- Male sex
- Obesity
- Insulin resistance or type 2 diabetes
- High blood pressure
- Other metabolic health conditions
These associations do not mean that one factor directly caused the condition in a particular person. Some people with DISH have few obvious risk factors.
Is DISH the same as ankylosing spondylitis?
No. Both conditions can make the spine stiff and can produce bridging bone on imaging, but they are different disorders.
DISH
DISH is generally considered a non-inflammatory bone-forming condition. It more commonly affects older adults and often preserves the height of the spinal discs despite extensive flowing bone formation.
Ankylosing spondylitis
Ankylosing spondylitis is an inflammatory rheumatic disease. It commonly begins earlier in life and may involve inflammatory back pain, sacroiliac-joint changes and other systemic features.
A GP, rheumatologist or other medical specialist may recommend further assessment when symptoms, examination findings or imaging do not clearly distinguish between these conditions.
How is DISH diagnosed?
DISH is usually identified through imaging rather than symptoms alone. An X-ray or CT scan may show flowing bone formation along the front and sides of several adjoining vertebrae.
Your clinician will consider:
- The number and location of spinal levels involved
- The pattern of bone formation
- The condition of the spinal discs and facet joints
- Whether the sacroiliac joints show inflammatory changes
- Your age, medical history and symptoms
- Whether another condition better explains the findings
MRI may be used when clinicians need to assess nerves, the spinal cord, soft tissues, suspected fracture or another overlapping condition. Blood tests do not diagnose DISH, although they may help investigate inflammatory disease or associated health concerns.
What matters most with DISH?
Stay active
Use regular, comfortable movement to maintain physical capacity without forcing a rigid spine.
Reduce falls risk
Strength, balance, suitable footwear and home safety become increasingly important when spinal movement is restricted.
Act after trauma
New spinal pain after a fall, collision or other trauma deserves prompt medical assessment.
When does DISH need urgent medical review?
Seek urgent assessment for these symptoms
- Severe or increasing spinal pain after a fall, collision or other trauma
- New weakness, numbness, tingling or difficulty walking
- Loss of bladder or bowel control
- Numbness around the groin or saddle area
- Increasing trouble swallowing, choking or food sticking
- New voice change, noisy breathing or shortness of breath
- Fever, unexplained weight loss or feeling systemically unwell with spinal pain
Large bony growths at the front of the cervical spine can occasionally affect the oesophagus, airway or nearby structures. These symptoms require medical assessment rather than exercise treatment alone.
How is DISH treated?
There is currently no treatment that reliably reverses the established bone formation. Management therefore focuses on symptoms, mobility, physical capacity, safety and related health conditions.
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Confirm the main source of symptoms
An assessment can help distinguish stiffness related to DISH from symptoms caused by muscles, joints, nerves, spinal stenosis, osteoarthritis or another condition.
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Maintain safe movement
A graded program may include spinal, shoulder and hip mobility. Exercises should stay within a comfortable range and account for the rigidity of the affected spine.
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Build strength and physical capacity
Strengthening the legs, hips, trunk and upper body may improve walking, transfers, balance and tolerance for daily tasks.
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Address falls risk
Balance training, suitable footwear, walking aids and changes to the home environment may reduce risk when stiffness or deconditioning affects mobility.
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Manage associated health factors
Your GP may review pain relief, diabetes, body weight, cardiovascular risk, bone health or other conditions that influence your overall management.
Surgery is uncommon. However, a specialist may consider it for an unstable spinal fracture, severe neurological compression, substantial swallowing or breathing problems, or another significant structural complication.
How may physiotherapy help DISH?
Physiotherapy does not remove the bony bridges caused by DISH. Instead, treatment aims to improve the function of the areas that can still move and to build the physical capacity required for everyday activity.
Assessment may include
- Spinal and peripheral-joint movement
- Muscle strength and endurance
- Walking and balance
- Nerve and neurological screening
- Posture and breathing mechanics
- Falls risk and daily activity limitations
Your program may include
- Comfortable mobility exercises
- Progressive strengthening
- Walking or aerobic conditioning
- Balance and falls-prevention exercises
- Pacing and activity planning
- Advice about safe movement after symptom changes
Where spinal pain or stiffness is the main limitation, back pain physiotherapy may form part of the management plan. A graded core stability program may also help when trunk endurance and movement control require improvement.
Can exercise help DISH?
Exercise may help maintain mobility, reduce deconditioning and improve everyday function. The goal is not to force a rigid spine to move normally or to break down the extra bone.
A balanced program may include:
- Gentle spinal movement within a comfortable range
- Shoulder and hip mobility
- Posture and breathing exercises
- Leg and trunk strengthening
- Walking, cycling or another suitable aerobic activity
- Balance and reaction exercises when falls risk is present
People who also have diabetes, cardiovascular risk factors or substantial deconditioning may benefit from a coordinated program involving their GP, physiotherapist and an accredited exercise physiologist.
Practical ways to manage DISH
Keep moving regularly
Frequent short periods of movement may be easier than remaining still for long periods and then attempting one long exercise session.
Build activity gradually
Increase walking, strengthening and household activity in manageable steps rather than making sudden large changes.
Reduce preventable falls
Address poor lighting, loose rugs, unsuitable footwear and other hazards, particularly when spinal stiffness limits quick reactions.
Review changing symptoms
Arrange reassessment when pain changes substantially, walking declines, new neurological symptoms develop or swallowing becomes difficult.
Choose your clinic and appointment pathway
Select a PhysioWorks clinic to continue to live booking, an appointment request or reception assistance.
References
- Luo TD, Varacallo M. Diffuse Idiopathic Skeletal Hyperostosis. StatPearls Publishing. Updated 2025.
- Eshed I, Lidar M. Imaging characteristics of diffuse idiopathic skeletal hyperostosis: more than just spinal bony bridges. Diagnostics. 2023;13(4):742. doi:10.3390/diagnostics13040742.
- Kuperus JS, de Gendt EEA, Oner FC, et al. Diffuse idiopathic skeletal hyperostosis: a review. Best Pract Res Clin Rheumatol. 2020;34(3):101527. doi:10.1016/j.berh.2020.101527.
- Harlianto NI, Foppen W, de Jong PA, et al. The prevalence of vertebral fractures in diffuse idiopathic skeletal hyperostosis and ankylosing spondylitis: a systematic review and meta-analysis. Osteoporos Int. 2024;35:759–773. doi:10.1007/s00198-024-06999-3.
- Al-Herz A, Snip JP, Clark B, Esdaile JM. Exercise therapy for patients with diffuse idiopathic skeletal hyperostosis. Clin Rheumatol. 2008;27:207–210. doi:10.1007/s10067-007-0683-4.
FAQs about DISH
Is DISH a form of arthritis?
DISH is usually described as a systemic, non-inflammatory bone-forming condition rather than ordinary joint arthritis. However, it is often grouped with musculoskeletal or rheumatological conditions and may exist alongside osteoarthritis.
Is DISH the same as ankylosing spondylitis?
No. DISH and ankylosing spondylitis can both cause spinal stiffness and bridging bone, but they are different conditions. DISH is generally non-inflammatory and more common later in life. Ankylosing spondylitis is an inflammatory rheumatic disease that commonly begins earlier.
Does DISH always cause pain?
No. Some people discover DISH on imaging despite having few symptoms. Others mainly notice stiffness, posture change or reduced movement tolerance. Pain may also come from nearby muscles, joints, nerves or an overlapping spinal condition.
Can DISH cause swallowing problems?
Yes. Large bony growths at the front of the cervical spine can occasionally affect nearby structures and contribute to swallowing difficulty. Seek medical assessment for choking, food sticking, voice change, noisy breathing or shortness of breath.
What exercise is best for DISH?
The most suitable exercise depends on the areas affected, your symptoms and your general health. Programs often combine comfortable mobility, walking or aerobic exercise, hip and shoulder movement, strengthening and balance training. Exercise should not forcibly push a rigid spine through pain.
Why can a minor fall be serious with DISH?
Extensive bone formation can make the spine less flexible and more rigid. Forces from a fall or collision may then spread across a longer section of the spine and cause an unstable fracture. New or severe spinal pain after trauma requires urgent medical assessment.
