Spondylolisthesis – what is it?

Spondylolisthesis, also known as spondylolysis, is a condition affecting approximately 3.1% of Poles, occurring in both children and adults. It most commonly occurs in the lower lumbar region, particularly between the L5 and S1 vertebrae, where a characteristic displacement of the vertebrae is observed in as many as 82% of cases. Understanding the causes, symptoms, and treatment methods for spondylolisthesis is essential for anyone struggling with back pain or wishing to prevent serious spinal problems.

From this article you will learn:

• What is spondylolisthesis? – Definition and nature of the condition
• The mechanism underlying spondylolisthesis and its impact on spinal structures
• Classification and stages of spondylolisthesis
• Causes and risk factors for spondylolisthesis
• Congenital causes in children
• Acquired causes in adults
• Clinical symptoms and diagnosis of spondylolisthesis
• Neurological symptoms in advanced cases
• Asymptomatic course of the disease and incidental diagnosis
• Diagnosis and imaging methods for spondylolisthesis: what is it?
• Medical history and physical examination as the first step in diagnosing spondylolisthesis
• Imaging tests – X-rays, CT scans, and MRI scans
• Additional tests – electromyography (EMG) and other complementary methods
• Conservative and surgical treatments for spondylolisthesis
• Conservative treatment in mild cases
• Surgical treatment in advanced cases
• Summary

What is spondylolisthesis? – Definition and nature of the condition

Spondylolisthesis, also known as vertebral slippage, is a spinal condition characterized by the displacement of one vertebra relative to another. It is a condition that can affect anyone—both children and adults—and, depending on its severity, can significantly impact a patient’s quality of life. In Poland, spondylolisthesis affects approximately 3.1% of the population, although many cases are completely asymptomatic and are detected incidentally during imaging tests performed for other reasons.

The mechanism underlying spondylolisthesis and its impact on spinal structures

The mechanism underlying spondylolisthesis is complex and can have various causes—both congenital and acquired (discussed in more detail in the following sections of this article). Regardless of the cause, the displaced vertebra exerts direct pressure on the surrounding anatomical structures. Pressure on the nerves—both on the spinal nerve roots and on the spinal cord itself—is particularly dangerous. When a displaced vertebra narrows the spinal canal or the intervertebral foramina through which the nerve roots pass, it leads to irritation or compression of these structures, manifesting as radiating pain, numbness, tingling, or weakness in the lower limbs.

Compression of the spinal nerve roots is one of the most serious consequences of untreated spondylolisthesis. As the disease progresses and the displacement increases, the space available for the nerve structures becomes increasingly restricted. This can lead to chronic nerve irritation and, in advanced cases, to permanent nerve damage. Furthermore, biomechanical disturbances in the spine resulting from vertebral instability affect the tension of the paraspinal muscles, which further exacerbates pain and limits the patient’s mobility.

Classification and stages of spondylolisthesis

Understanding what spondylolisthesis is and how its severity is assessed forms the basis for proper treatment planning. The Meyerding classification is a widely used diagnostic tool that allows for precise assessment of the degree of vertebral displacement and selection of an appropriate treatment method. It is a five-point scale for evaluating spondylolisthesis, based on the percentage of displacement of the upper vertebra relative to the lower one. Grade I involves a slippage of 1 to 25%—this is the mildest form of the condition, which in many cases is asymptomatic or causes only moderate pain. Grade II indicates a displacement of 26–50% and is associated with more pronounced pain symptoms, although effective conservative treatment is still possible. Grade III, involving a slippage of 51 to 75%, and Grade IV, where the displacement ranges from 76 to 100%, are advanced forms that typically require more intensive therapeutic management. Grade V—also known as spondyloptosis—refers to a displacement exceeding 100%, leading to a complete loss of contact between adjacent vertebrae. This is the most severe form of the condition, carrying a risk of permanent neurological damage, including paralysis.

In clinical practice, the severity grades of spondylolisthesis are a key factor in determining the choice of treatment strategy. Grades I and II typically qualify a patient for conservative therapy, including rehabilitation and medication, while grades III and IV—and especially grade V—often require surgical intervention. It is worth noting that, in addition to the classic five-stage scale, a simplified three-stage classification is also used, facilitating rapid clinical assessment in outpatient settings.

Causes and risk factors for spondylolisthesis

Understanding the causes of spondylolisthesis is crucial for both effective prevention and the selection of an appropriate treatment method. The causes of this condition are complex and varied—they may be congenital, related to abnormal spinal development, or acquired, resulting from overuse, mechanical trauma, or the body’s natural aging process. In many cases, the onset of spondylolisthesis is influenced by several factors simultaneously, which makes it difficult to pinpoint a single cause and requires an individualized diagnostic approach.

Congenital causes in children

Congenital causes of spondylolisthesis result from abnormalities in the structure of the spine that are present at birth or become apparent as the child grows. It is worth noting that spondylolisthesis does not occur in infants or children who are not yet walking—the condition only manifests itself once the spine is regularly subjected to the weight of an upright body posture. The most common congenital causes include:

• Spondylolysis – a defect or fracture within the intervertebral portion of the vertebral arch that weakens the stability of the vertebra and predisposes it to slippage.
• Spinal malformations – structural abnormalities affecting the shape or structure of the vertebrae that interfere with the proper distribution of weight along the entire length of the spine.
• Abnormalities in the alignment of the articular processes – incorrect orientation of the articular surfaces, which reduces the spine’s natural resistance to shear forces.

Early diagnosis is particularly important for children with congenital structural abnormalities of the spine. It allows for the implementation of appropriate treatment before the slippage progresses and serious neurological symptoms develop.

Acquired causes in adults

In adults, spondylolisthesis is most often acquired and develops as a result of various pathological processes occurring within the spine. Degenerative changes are one of the main causes of acquired spondylolisthesis—the gradual wear and tear of the intervertebral discs leads to a loss of disc height, changes in the geometry of the intervertebral joints, and weakening of the ligamentous apparatus, all of which contribute to vertebral instability. The most important causes of acquired spondylolisthesis include:

• Degeneration of the intervertebral discs – natural wear and tear of the disc’s cartilaginous and fibrous structures, which reduces its ability to cushion and stabilize the adjacent vertebrae.
• Mechanical injuries – sudden, severe injuries to the spine, such as falls or traffic accidents, can lead to damage to the vertebral arch and vertebral displacement.
• Stress fractures – microtraumas that accumulate as a result of repeated stress, particularly within the intervertebral portion of the vertebral arch, which gradually lead to its fracture.
• Weakness of the muscles that stabilize the spine—insufficient strength in the deep back muscles and abdominal muscles reduces the dynamic stability of the spine, which increases the risk of vertebral slippage.
• Pathological changes – in rarer cases, spondylolisthesis may be caused by neoplastic processes or other pathological changes that weaken the bony structures of the spine.

Due to the complexity of risk factors, acquired spondylolisthesis rarely results from a single, isolated cause in clinical practice. Most often, it is the result of the combined presence of several adverse biomechanical and degenerative factors that, together, exceed the spine’s compensatory capacity.

Clinical symptoms and diagnosis of spondylolisthesis

The most common and characteristic symptom of spondylolisthesis is acute or chronic lower back pain, which patients describe as dull, burning, or radiating. Lumbar pain associated with spondylolisthesis tends to worsen during prolonged sitting, intense physical activity, and when performing flexion and rotation movements of the spine. It is also characteristic that the symptoms may subside after resting in a lying position, which results from the relief of pressure on the spinal structures.

The pain is often not limited to the lumbar region alone—it radiates to the buttocks, thighs, and even the lower legs and feet. This radiation of pain is caused by pressure from a displaced vertebra on the spinal nerve roots. Patients also complain of significant back stiffness, which is particularly noticeable in the morning upon waking or after remaining in one position for an extended period. Limited spinal mobility—especially difficulty straightening the back and bending forward—is another typical symptom that prompts patients to seek medical help. During a physical examination, the doctor may detect tenderness on palpation in the area of the affected spinal segment and a characteristic “step” felt upon palpation of the spinous processes.

Neurological symptoms in advanced cases

As the disease progresses and pressure on the nerve structures increases, neurological symptoms appear, serving as a serious warning sign requiring urgent medical intervention. The most common symptoms include numbness and tingling in the lower limbs, which may affect the thighs, lower legs, and even the feet. Patients describe these sensations as “electric shocks,” “burning,” or a feeling of “sleepy legs.” Sensory disturbances can be unilateral or bilateral, depending on which nerve roots are compressed.

In more advanced stages of spondylolisthesis, patients experience weakness in the lower limbs—they feel a loss of muscle strength, have difficulty walking, and may even have problems with balance and motor coordination. Weakened tendon reflexes, particularly the knee and ankle reflexes, are another symptom indicating nerve root damage. In extreme cases, when there is severe compression of nerve structures, urinary and bowel dysfunction may occur—both in the form of difficulty with urination and defecation, as well as incontinence. The appearance of these symptoms requires immediate medical consultation, as they may indicate cauda equina syndrome—a condition requiring urgent surgical treatment.

Asymptomatic course of the disease and incidental diagnosis

An important aspect of spondylolisthesis to be aware of is that many people experience no symptoms for a long time. The condition can develop over years without any obvious clinical symptoms, and it is often diagnosed incidentally—during imaging tests performed for entirely different reasons, such as following an injury or as part of the diagnosis of another condition. It is estimated that a significant proportion of spondylolisthesis cases, particularly those classified as Grade I according to the Meyerding classification, are asymptomatic or present with minimal symptoms.

However, the absence of symptoms does not mean that the condition is harmless or that it does not require monitoring. Even in the absence of obvious symptoms, regular monitoring of the spine is necessary, as vertebral displacement can progress, leading to increasing neurological symptoms. The severity of symptoms often increases with age, along with the natural process of intervertebral disc degeneration and weakening of the spinal ligaments. Therefore, anyone in whom spondylolisthesis is incidentally detected should remain under the care of a specialist and follow their recommendations regarding physical activity and prevention.

Diagnosis and imaging methods for spondylolisthesis: what is it?

Accurate diagnosis of spondylolisthesis requires a multi-step diagnostic process that combines a thorough medical history, a physical examination, and a series of imaging tests. Because the symptoms of spondylolisthesis can be nonspecific and overlap with other spinal conditions, accurate diagnosis is crucial for implementing effective treatment and preventing further progression of the disease. It is worth noting that the structural findings obtained from imaging studies do not always reflect the patient’s actual symptoms; therefore, test results should always be interpreted in the context of the overall clinical picture.

Medical history and physical examination as the first step in diagnosing spondylolisthesis

The diagnosis of spondylolisthesis begins with a detailed medical history, during which the specialist gathers information about the nature and location of the pain, the duration of the symptoms, factors that exacerbate or alleviate the pain, and any neurological symptoms. The medical history is an indispensable part of the diagnostic process, as it allows the doctor to guide further management and select appropriate diagnostic methods. Information regarding past injuries, the patient’s physical activity, and—in the case of children and adolescents—congenital defects or previously diagnosed spinal abnormalities is also important.

The physical examination is another extremely important step in the diagnostic process. The doctor assesses the patient’s posture, the range of motion of the spine, the tension of the paraspinal muscles, and the presence of pain when pressure is applied to specific spinous processes. The neurological examination assesses reflexes, muscle strength, and sensation in the lower limbs, which helps determine whether there is compression of the nerve roots. The physical examination also allows for the initial differentiation of spondylolisthesis from other spinal conditions, such as disc disease or spinal stenosis.

Imaging tests – X-rays, CT scans, and MRI scans

The primary imaging test used to diagnose spondylolisthesis is an X-ray of the spine taken in the standing position, in two views—anterior-posterior and lateral. Performing the examination in the standing position is crucial because it allows for the visualization of the actual degree of vertebral displacement under the influence of gravitational load, which in the supine position may be significantly smaller or more difficult to detect. Based on the X-ray image, the physician can assess the degree of vertebral slippage according to the Meyerding classification, as well as differentiate spondylolisthesis from fractures and other bone pathologies.

In cases where an X-ray does not provide sufficient information or when a more detailed assessment of bone structures is necessary, a doctor may order a computed tomography (CT) scan. Imaging studies of this type provide a detailed view of the spinal bones in cross-sectional views and three-dimensional reconstructions, which is particularly useful for evaluating vertebral arches, articular processes, and any stress fractures that may be causing spondylolisthesis. Computed tomography also enables precise planning of any surgical treatment.

Magnetic resonance imaging (MRI) is the test of choice for evaluating the soft tissues surrounding the spine, including the intervertebral discs, ligaments, nerve roots, and spinal cord. This test allows for a precise assessment of spinal canal stenosis, nerve compression, and the condition of the intervertebral discs, which is crucial for determining the cause of neurological symptoms and planning appropriate treatment. Magnetic resonance imaging is particularly valuable in advanced cases of spondylolisthesis, when significant compression of neural structures is suspected.

Additional tests – electromyography (EMG) and other complementary methods

In cases where neurological symptoms are severe or when imaging results do not clearly correlate with the patient’s symptoms, a doctor may order an electromyography (EMG). This is a test that evaluates the function of peripheral nerves and muscles, allowing doctors to determine whether and to what extent nerve roots have been damaged. EMG is particularly useful in differentiating spondylolisthesis from other nervous system disorders, such as peripheral neuropathies or nerve damage at other levels of the spine.

The diagnosis of spondylolisthesis may be supplemented with additional laboratory tests or specialist consultations, especially when an inflammatory or metabolic cause is suspected. A comprehensive diagnostic approach allows not only for confirming the diagnosis of spondylolisthesis but also for determining its cause, stage of progression, and impact on surrounding structures—information essential for developing a personalized treatment plan. At the Paley European Institute, each patient is treated individually, and the selection of diagnostic methods is tailored to their specific clinical situation and reported symptoms.

Conservative and surgical treatments for spondylolisthesis

The choice of the appropriate treatment for spondylolisthesis depends primarily on the stage of the condition, the severity of clinical symptoms, and the patient’s overall health—there is no single universal treatment protocol. Treatment may be conservative, focused on alleviating symptoms and stabilizing the spine without surgical intervention, or surgical, when non-surgical methods prove insufficient.

Conservative treatment in mild cases

In cases of Grade I and II spondylolisthesis, where vertebral slippage does not exceed 50%, conservative treatment is the primary and most commonly used approach. This approach includes several complementary elements aimed at reducing pain, relieving pressure on compressed nerve structures, and improving spinal stability.

The first pillar of conservative treatment is physical therapy, with a program tailored specifically to the individual patient’s needs. Exercises that strengthen the core muscles—the deep muscles that stabilize the spine, such as the multifidus, transverse abdominis, and pelvic floor muscles—play a key role. Strong core muscles take over some of the load placed on the vertebrae, thereby reducing the risk of further slippage and alleviating pain. Regular exercise under the supervision of a physical therapist allows for the gradual rebuilding of the natural muscle corset.

Another key element is the use of orthopedic braces, which immobilize the lumbar spine and limit movements that could exacerbate vertebral displacement. Braces are primarily used during episodes of acute pain or during physical activities that increase the load on the spine. However, it is important not to treat the brace as the sole form of therapy—prolonged use without concurrent muscle strengthening can lead to a weakening of the spine’s natural stability.

Pain management is also an essential component of conservative treatment. Nonsteroidal anti-inflammatory drugs (NSAIDs), muscle relaxants, and, when indicated, corticosteroid injections into the epidural space are used to effectively reduce inflammation in the immediate vicinity of the compressed nerve roots. Pharmacotherapy plays a supportive role—its goal is to enable the patient to actively participate in rehabilitation by controlling pain symptoms.

Surgical treatment in advanced cases

When conservative treatments fail to produce the expected improvement or when the condition reaches an advanced stage, surgical treatment becomes necessary. The primary indications for surgery are: a degree of vertebral displacement exceeding 50% (Grade III and IV spondylolisthesis), severe neurological symptoms such as lower limb paresis, sensory disturbances, as well as bladder and bowel dysfunction. The goal of the surgery is both to relieve pressure on the nerve roots and to permanently stabilize the spine.

The primary surgical method used to treat advanced spondylolisthesis is spondylodesis, which involves stabilizing the spine by surgically fusing adjacent vertebrae. The procedure involves filling the space between the vertebrae with a bone graft or special intervertebral cages, which over time leads to bone fusion and permanent stabilization of the unstable segment. Spondylodesis eliminates pathological movement between the vertebrae, which is the cause of pain and nerve compression.

During surgery, titanium components are used to stabilize the spine—transpedicular screws, rods, and titanium plates—which provide immediate mechanical stability to the operated segment and maintain proper vertebral alignment until the bone graft has fully fused. Titanium is a biocompatible material that is corrosion-resistant and neutral to body tissues, making it an ideal choice for spinal surgery. In some cases, the surgery also involves decompression of the spinal canal—the removal of tissue fragments compressing the nerves—which directly alleviates neurological symptoms.

The decision to proceed with surgery is always made after a thorough analysis of imaging results and the patient’s clinical condition. It is important to emphasize that a personalized approach to each case remains a key principle—both in selecting the surgical technique and in planning postoperative rehabilitation, which is essential for a full return to fitness following surgery.

Summary

Spondylolisthesis is a serious spinal condition that can cause pain, neurological symptoms, and limit physical function. The condition is classified based on its severity and can have both congenital and acquired causes. Early diagnosis and personalized treatment—ranging from rehabilitation to surgical procedures—are key to effective management. Remember that symptoms do not always correspond to changes visible on imaging studies, which is why a holistic approach to the patient is essential. If you are experiencing chronic back pain or radiating symptoms, don’t delay—consult an orthopedic surgeon or neurologist. Take advantage of the services offered by paleyeurope.com, where you’ll find professional support and modern treatment methods to help you regain full mobility.