Adult cervical deformity

Adult cervical deformity is an abnormal alignment of the neck that develops or becomes symptomatic in adulthood. The deformity may involve excessive forward bending, abnormal side-to-side curvature, rotation, translation between vertebrae, or a combination of these problems.

Some cervical deformities cause primarily neck pain and difficulty holding the head upright. Others can also narrow the spinal canal or neural foramina and lead to spinal cord compression, nerve root compression, weakness, numbness, balance problems, or difficulty walking.

Treatment depends on the severity of the deformity, the symptoms it causes, and whether the spinal cord or nerves are being compressed.

What Is Normal Cervical Alignment?

The cervical spine normally has a gentle backward curve called cervical lordosis.

This alignment helps:

  • Support the weight of the head
  • Maintain horizontal vision
  • Balance the head over the shoulders
  • Reduce muscular effort
  • Distribute forces through the neck

When this normal relationship is lost, the muscles of the neck may have to work harder to keep the head upright.

What Is Adult Cervical Deformity?

Adult cervical deformity is a broad term that includes several abnormal alignment patterns.

These may include:

  • Cervical kyphosis
  • Loss of cervical lordosis
  • Cervical scoliosis
  • Rotational deformity
  • Forward translation of the head
  • Chin-on-chest deformity
  • Junctional deformity after previous spinal fusion

The deformity may be limited to the cervical spine or may occur as part of a larger deformity involving the thoracic or lumbar spine.

Cervical Kyphosis

Cervical kyphosis occurs when the cervical spine bends forward instead of maintaining its normal lordotic curve.

Mild loss of lordosis is common and does not always cause symptoms.

More severe kyphosis can lead to:

  • Neck pain
  • Muscle fatigue
  • Difficulty maintaining horizontal gaze
  • Spinal cord compression
  • Difficulty swallowing in selected cases
  • Progressive neurologic dysfunction

Severe cases may produce a visible forward-flexed posture of the head and neck.

What Causes Adult Cervical Deformity?

Possible causes include:

  • Degenerative disc disease
  • Facet joint degeneration
  • Previous cervical spine surgery
  • Failure of a previous spinal fusion
  • Adjacent segment disease
  • Trauma
  • Vertebral fracture
  • Infection
  • Tumor
  • Inflammatory disease
  • Neuromuscular disorders
  • Congenital abnormalities
  • Ankylosing conditions

In some patients, several factors contribute.

Cervical Deformity After Previous Surgery

Previous cervical spine surgery is an important cause of adult deformity.

Deformity may develop after:

  • Multilevel laminectomy
  • Previous cervical fusion
  • Failed fusion or pseudarthrosis
  • Adjacent segment degeneration
  • Hardware failure
  • Progressive degeneration above or below a fusion

Removal of the posterior stabilizing structures during a laminectomy can occasionally contribute to progressive kyphosis, particularly in patients who already have poor alignment or instability.

Symptoms of Adult Cervical Deformity

Symptoms vary widely.

Possible symptoms include:

  • Neck pain
  • Muscle fatigue
  • Difficulty holding the head upright
  • Headaches
  • Shoulder pain
  • Arm pain
  • Numbness or tingling
  • Arm or hand weakness
  • Loss of hand coordination
  • Difficulty walking
  • Poor balance

Patients with severe deformity may also have difficulty keeping the eyes level with the horizon.

Difficulty Maintaining Horizontal Gaze

One of the most disabling symptoms of severe cervical deformity is difficulty looking straight ahead.

Patients may feel that their head is pulled downward or forward.

This can make it difficult to:

  • Walk safely
  • Drive
  • Eat
  • Read
  • Interact socially
  • Perform routine activities

Some patients compensate by extending the upper cervical spine or changing the alignment of the thoracic and lumbar spine.

Chin-on-Chest Deformity

A chin-on-chest deformity is an advanced form of cervical kyphosis in which the head becomes severely flexed forward.

Possible causes include:

  • Severe degeneration
  • Neuromuscular disease
  • Dropped head syndrome
  • Previous surgery
  • Ankylosing conditions
  • Progressive spinal deformity

Severe chin-on-chest deformity may interfere with:

  • Horizontal gaze
  • Eating
  • Swallowing
  • Breathing
  • Personal hygiene

Treatment can be complex.

Cervical Deformity and Myelopathy

A cervical deformity can narrow the spinal canal and compress the spinal cord.

This can cause cervical myelopathy.

Symptoms may include:

  • Hand clumsiness
  • Weakness
  • Numbness
  • Difficulty walking
  • Balance problems
  • Leg stiffness
  • Frequent falls

When progressive myelopathy is present, treatment may be directed not only toward improving alignment but also toward protecting the spinal cord.

Cervical Deformity and Radiculopathy

Deformity can also narrow the neural foramina where individual nerve roots exit the spine.

This may cause cervical radiculopathy with:

  • Arm pain
  • Numbness
  • Tingling
  • Weakness
  • Changes in reflexes

Both radiculopathy and myelopathy may be present at the same time.

Flexible Versus Rigid Cervical Deformity

An important part of evaluation is determining whether the deformity is flexible or rigid.

Flexible Deformity

A flexible deformity improves when the patient changes position or when the neck is extended.

These deformities may be easier to correct surgically.

Rigid Deformity

A rigid deformity remains fixed despite changes in position.

Possible reasons include:

  • Severe arthritis
  • Previous fusion
  • Ankylosis
  • Large bone spurs
  • Advanced degeneration

Rigid deformities may require more extensive reconstruction.

How Is Adult Cervical Deformity Evaluated?

Evaluation begins with a detailed history and neurologic examination.

The physician may assess:

  • Head position
  • Shoulder position
  • Horizontal gaze
  • Neck mobility
  • Strength
  • Sensation
  • Reflexes
  • Hand coordination
  • Walking and balance

Imaging is then used to understand the deformity and determine whether the spinal cord or nerves are compressed.

Standing X-Rays

Standing X-rays are particularly important.

They can show:

  • Cervical lordosis or kyphosis
  • Forward translation of the head
  • Overall spinal balance
  • Previous fusion
  • Hardware failure
  • Scoliosis
  • Junctional deformity

Full-length standing X-rays may be obtained because the alignment of the thoracic and lumbar spine can influence the position of the neck.

Flexion-Extension X-Rays

Flexion-extension imaging may help determine:

  • Whether the deformity is flexible
  • Whether instability is present
  • Whether abnormal movement occurs around a previous fusion

This information can help guide treatment planning.

MRI

MRI can evaluate:

  • Spinal cord compression
  • Nerve root compression
  • Disc degeneration
  • Spinal stenosis
  • Abnormal spinal cord signal
  • Soft-tissue structures

MRI is especially important when myelopathy or radiculopathy is present.

CT Scan

CT provides detailed information about:

  • Bone anatomy
  • Previous fusion
  • Pseudarthrosis
  • Bone spurs
  • Facet joint degeneration
  • Ankylosis
  • Hardware position

CT is often useful when planning complex reconstructive surgery.

Does Every Cervical Deformity Require Surgery?

No.

Many mild deformities can be managed without surgery, particularly when:

  • Symptoms are limited
  • Neurologic function is normal
  • The deformity is stable
  • Quality of life remains acceptable

Nonsurgical treatment may include:

  • Physical therapy
  • Postural exercises
  • Activity modification
  • Anti-inflammatory medications
  • Pain management
  • Treatment of osteoporosis when appropriate

These treatments may improve symptoms but generally cannot correct a fixed structural deformity.

When Is Surgery Considered?

Surgery may be considered when there is:

  • Progressive deformity
  • Severe neck pain
  • Difficulty maintaining horizontal gaze
  • Progressive myelopathy
  • Significant radiculopathy
  • Spinal cord compression
  • Failure of a previous cervical fusion
  • Progressive neurologic dysfunction
  • Major functional limitation

The decision depends on the severity of symptoms and the risks of reconstruction.

Goals of Cervical Deformity Surgery

The goals may include:

  • Decompressing the spinal cord
  • Relieving nerve compression
  • Restoring more normal alignment
  • Improving horizontal gaze
  • Stabilizing the spine
  • Correcting instability
  • Reducing pain
  • Preventing further neurologic deterioration

The goal is not necessarily to create a perfectly normal X-ray.

Instead, surgery aims to create an alignment that is balanced, functional, neurologically safe, and sustainable.

Anterior Cervical Reconstruction

Some deformities can be treated through an anterior approach.

Procedures may include:

  • Anterior cervical discectomy and fusion
  • Multilevel ACDF
  • Cervical corpectomy
  • Osteophyte removal
  • Interbody reconstruction

Anterior surgery can be useful when the deformity is relatively flexible and the major compression is located in front of the spinal cord.

Posterior Cervical Reconstruction

Posterior surgery may involve:

  • Laminectomy
  • Facetectomy
  • Osteotomy
  • Pedicle or lateral mass screws
  • Rods
  • Spinal fusion

This approach can provide strong fixation and may be particularly useful when several levels need to be stabilized.

Combined Anterior and Posterior Surgery

More severe or rigid deformities may require both anterior and posterior surgery.

A combined approach may allow the surgeon to:

  • Release a rigid deformity
  • Decompress the spinal cord
  • Restore alignment
  • Provide stronger stabilization

These operations are more extensive and require careful planning.

Cervical Osteotomies

An osteotomy is a controlled cut through bone used to restore alignment.

In severe cervical deformity, osteotomies may be necessary when the spine is rigid.

Different types of osteotomies can provide different amounts of correction.

More powerful osteotomies can also carry greater risk because they are performed close to the spinal cord, nerve roots, and vertebral arteries.

Cervicothoracic Junction

The transition between the neck and upper back is called the cervicothoracic junction.

This region plays a major role in cervical alignment.

Some deformities cannot be corrected adequately by focusing on the cervical spine alone.

Surgery may need to extend into the upper thoracic spine to achieve stable correction.

The Importance of Global Spinal Alignment

The cervical spine does not function independently from the rest of the spine.

Changes in the:

  • Thoracic spine
  • Lumbar spine
  • Pelvis

can alter the position of the head and neck.

For example, a patient with significant thoracic kyphosis may extend the cervical spine to maintain horizontal gaze.

For this reason, complex cervical deformity evaluation often includes full-spine standing imaging.

Risks of Cervical Deformity Surgery

Adult cervical deformity surgery can be more complex than routine cervical decompression or fusion.

Potential risks include:

  • Spinal cord injury
  • Nerve root injury
  • Weakness
  • Difficulty swallowing
  • Voice changes
  • Dural tear
  • Infection
  • Bleeding
  • Vertebral artery injury
  • Hardware failure
  • Pseudarthrosis
  • Junctional failure
  • Loss of correction
  • Need for additional surgery

The individual risk depends heavily on the severity of the deformity and the extent of reconstruction required.

C5 Palsy

One specific neurologic complication after some cervical decompression and deformity procedures is C5 palsy.

This can cause weakness of the:

  • Deltoid
  • Biceps

Symptoms may range from mild weakness to more significant difficulty lifting the arm.

Many patients improve over time, but recovery can take months.

Bone Quality and Cervical Deformity Surgery

Bone quality is particularly important when large spinal constructs are required.

Osteoporosis may increase the risk of:

  • Screw loosening
  • Hardware failure
  • Junctional fracture
  • Loss of correction
  • Nonunion

Bone health may therefore be evaluated and optimized before major reconstructive surgery.

Recovery After Surgery

Recovery varies according to the extent of reconstruction.

Patients may initially focus on:

  • Walking
  • Swallowing
  • Pain control
  • Neurologic recovery
  • Maintaining corrected posture

Physical therapy may later help with:

  • Strength
  • Walking
  • Balance
  • Endurance
  • Shoulder mobility

Fusion and neurologic recovery continue over several months.

What Results Can Be Expected?

Results depend on:

  • Severity of deformity
  • Neurologic status before surgery
  • Degree of spinal cord injury
  • Flexibility of the spine
  • Bone quality
  • Overall health

Successful treatment may improve:

  • Horizontal gaze
  • Neck position
  • Pain
  • Walking
  • Balance
  • Neurologic function
  • Ability to perform daily activities

However, severe or long-standing spinal cord dysfunction may not completely recover.

When Should Cervical Deformity Be Evaluated Promptly?

Prompt evaluation is appropriate when deformity is associated with:

  • Progressive weakness
  • Increasing hand clumsiness
  • Difficulty walking
  • Worsening balance
  • Frequent falls
  • Rapidly progressive deformity
  • Inability to maintain horizontal gaze
  • New bowel or bladder dysfunction with other signs of spinal cord dysfunction

These findings may indicate significant cervical spinal cord compromise.

Outlook

Adult cervical deformity is a complex condition that can range from mild loss of normal cervical alignment to severe rigid kyphosis with spinal cord compression.

Treatment should be individualized based on:

  • Symptoms
  • Neurologic function
  • Severity of deformity
  • Flexibility
  • Spinal cord and nerve compression
  • Previous surgery
  • Overall spinal alignment
  • Bone quality
  • Patient goals

Mild and stable deformities can often be treated without surgery.

When deformity causes progressive neurologic dysfunction, severe pain, major loss of function, or inability to maintain horizontal gaze, reconstructive surgery may be considered.

The goal of treatment is to create a stable, balanced cervical spine while protecting the spinal cord and preserving neurologic function.

Related Topics

  • Cervical Kyphosis
  • Cervical Myelopathy
  • Cervical Spinal Stenosis
  • Cervical Instability
  • Cervical Pseudarthrosis
  • Adjacent Segment Disease
  • Cervical Corpectomy
  • Posterior Cervical Fusion
  • Cervicothoracic Fusion
  • Revision Cervical Spine Surgery