Lower Back Pain in Children and Adolescents: Stress Fractures (Spondylolysis)

One of the most common causes of lower back pain in children and teenagers is a stress fracture in the spine. Medically known as "spondylolysis," this condition typically occurs in young, active athletes due to excessive strain on the spinal bones. If your child's back pain does not improve with rest, worsens during sports, or radiates down their legs, a specialist's evaluation is absolutely necessary to determine whether an underlying stress fracture is to blame.

In brief:

• Spondylolysis is a stress fracture in the bones of the lower spine (usually the 4th or 5th lumbar vertebra).
• Sports that force the lower back to bend backwards—such as gymnastics, football, weightlifting, and volleyball—increase the risk.
• The most fundamental symptom is lower back pain that flares up with physical activity and eases with rest.
• When diagnosed early, it usually heals with non-surgical methods like rest, a medical brace, and physical therapy.
• If left untreated, it can lead to spinal slippage (spondylolisthesis), causing nerve compression.

What is Spondylolysis (Stress Fracture)?

Our spine is made up of 24 small bones called vertebrae, stacked on top of one another. They keep us upright and protect the spinal cord running through them. The lower part of the spine, the lumbar region, carries a large portion of our body weight. The answer to "what is spondylolysis" lies right in this area: it is a crack or stress fracture occurring in the thin bridge of bone at the back of the vertebrae, known as the "pars interarticularis."

This condition is most often seen in the 4th or 5th lumbar vertebra. While adult bones are harder and fully developed, the bones of children and teenagers are still growing, making them much more sensitive to repetitive strain. Rather than happening from a single sudden trauma, it occurs when small, cumulative damages over time exceed the bone's ability to heal itself. Just like a piece of wire that is repeatedly bent at the same spot until it weakens and snaps, this delicate bony structure in the spine loses its integrity under excessive loading.

Causes and Risk Factors for Lower Back Pain in Adolescents

Although lower back pain complaints are rarer in childhood and adolescence compared to adulthood, the underlying causes are usually more specific. Stress fractures rank high among the causes of lower back pain in teenagers and are largely linked to physical activity habits.

Sports that require excessive backward bending (hyperextension) of the spine while twisting simultaneously are the biggest risk factors. Young athletes involved in disciplines like gymnastics, figure skating, ballet, football, weightlifting, volleyball, and wrestling have a notably high probability of developing stress fractures. During growth spurts, bones lengthen rapidly, but muscles and ligaments do not always stretch at the same rate, which also increases mechanical stress on the spine.

In addition, genetic predisposition plays an important role. Some children may be born with a naturally thinner "pars interarticularis" in their spine. This structural trait raises the risk of developing a stress fracture even during normal levels of sporting activity.

Symptoms of Lower Back Pain in Children and Adolescents

In its initial stages, spondylolysis may not always cause noticeable complaints. In fact, many children continue their daily lives without even realizing they have a slight crack in their spine. However, as the crack progresses and tissue inflammation (edema) begins, the most common symptom—lower back pain—makes itself known.

This pain is usually felt in the lower back, right around the belt line, and can easily be mistaken for a muscle spasm or strain. The most typical characteristic of this pain is that it worsens when playing sports or bending backwards, and subsides when resting.

If the stress fracture is left untreated and the vertebra begins to slip forward, the clinical picture changes. In this advanced stage, known as spondylolisthesis, symptoms include severe tightness in the back of the thighs (hamstrings), stiffness in the back, and posture or gait abnormalities, such as walking with slightly bent knees. If the nerves exiting the spinal cord become pinched due to the slippage, pain can radiate from the hips down to the legs; numbness, tingling, or a loss of strength in the legs may also be experienced.

How is it Diagnosed? (Diagnostic Methods)

When your child visits a doctor with complaints of lower back pain, the process begins with a detailed physical examination. The physician will check the child's posture, spinal curvature, and hamstring tightness. They will try to pinpoint the source of the pain by gently stretching the back backwards or performing a one-legged hyperextension test.

For a definitive diagnosis, imaging methods are utilized:

• X-ray: This is the standard first step. X-rays taken from different angles can clearly show the crack in the spine or whether there is any slippage in the bones.
• Magnetic Resonance Imaging (MRI): This is the most effective method in the early stages, when the stress fracture hasn't yet become a full crack but is merely at the bone marrow edema (inflammation) stage. An MRI also provides a detailed view of the nerve roots and spinal discs.
• Computed Tomography (CT): This method shows the bone structure down to the finest detail. It provides your doctor with a comprehensive map to assess the size of the fracture, its healing potential, and to plan any necessary surgery.

What Are the Treatment Methods for Lumbar Stress Fractures?

Treatment for a stress fracture in the lower back is planned with the goals of relieving the child's pain, ensuring the fracture heals (fuses), and facilitating a safe return to daily life or sports. In the vast majority of cases, non-surgical (conservative) methods yield successful results.

The first and most crucial step is to reduce the load on the spine. The child needs to take a break from the sports activities and strenuous movements that cause the pain. Your doctor may prescribe short-term painkillers or anti-inflammatory medications to control pain and swelling. To give the fracture a chance to heal, using special medical braces that keep the lower back stable is a frequently preferred method. Brace usage typically lasts between 6 to 12 weeks.

Once the pain subsides, the physical therapy process begins. Strengthening the abdominal and back muscles (the core), stretching tight hamstring muscles, and balancing the load on the spine are of critical importance. The time it takes for a child to return to sports generally ranges from 3 to 6 months, depending on the severity of the fracture and the speed of healing. The decision to return to sports must be approved by a physician and done gradually.

In cases of advanced spondylolisthesis (spinal slippage) or for patients whose pain does not resolve despite months of non-surgical treatments, surgical intervention may be considered. In this surgery, called spinal fusion, the slipped vertebrae are secured together using special screws and bone grafts. This restores the stability of the spine and removes the pressure on the nerves.

Complications and Risk Groups

If spondylolysis is not noticed in time and managed correctly, the crack in the spine can spread to both sides. This sets the stage for the vertebra to slip forward over the bone below it. As the spinal slippage progresses, it can narrow the spinal canal, compress the nerves traveling to the legs, and cause chronic pain as well as permanent walking difficulties.

The highest risk group is active adolescent athletes between the ages of 10 and 15. During this period, when the growth plates have not yet closed, suddenly increasing training intensity or using incorrect sporting techniques significantly raises the risk of complications.

When is Lower Back Pain in Children Dangerous?

Not every backache in children is caused by a stress fracture. Sometimes, much more serious infections or structural issues can lead to pain. If you observe any of the following warning signs (red flags) in your child, you should seek medical help without delay:

• If the pain is severe enough to wake them from sleep at night,
• If the back pain is accompanied by a high fever, unexplained weight loss, or night sweats,
• If there is sudden numbness, loss of sensation, or noticeable weakness in the legs,
• If issues like urinary incontinence or loss of bowel control appear suddenly.

A sudden loss of strength in the legs, especially combined with the inability to control urine or stool, is an emergency indicating that the nerve bundle in the spinal cord is severely compressed. In such a scenario, you must immediately call 112 or go to the nearest hospital emergency room.

Diagnosis and Treatment Process at BHT CLINIC İstanbul Tema Hastanesi

At BHT CLINIC İstanbul Tema Hastanesi, we intervene in spinal disorders seen in children and adolescents with a multidisciplinary approach. Thanks to our advanced imaging technologies, we detect stress fractures at the earliest stage and create the most appropriate treatment plan that will not negatively impact your child's growth process.

During non-surgical treatment processes, the expert physiotherapists in our Physical Therapy and Rehabilitation unit prepare personalized exercise programs for your child, supporting their safe return to sports. For advanced spinal slippage cases requiring surgery, the experienced physicians in our Neurosurgery department successfully apply the most current and safe surgical techniques. In cases of unexpected and severe pain, our 24/7 emergency department is always by your side.

Frequently Asked Questions

Will a stress fracture heal on its own?

A stress fracture will not heal on its own without reducing the load on the spine and providing the necessary rest. Continuing the activity can cause the fracture to enlarge and lead to spinal slippage. Therefore, a medical evaluation and a resting period under a doctor's supervision are absolutely essential.

When can my child return to sports?

The time to return to sports varies depending on the severity of the fracture and the child's response to treatment. Generally, a recovery period of 3 to 6 months, which includes wearing a brace and physical therapy, is required. Your doctor will allow a gradual return to sports only after confirming that the bone has fused via imaging tests.

Does spinal slippage (spondylolisthesis) cause paralysis?

Spinal slippage can compress nerves, causing numbness, pain, and loss of strength in the legs, but it is extremely rare for it to lead to complete paralysis. With early diagnosis and the correct treatment methods, the risk of nerve damage is eliminated.

Does wearing a brace weaken the muscles?

Braces used in the treatment of stress fractures are worn temporarily (usually 6-12 weeks) to provide the immobility needed for the bone to fuse. While there may be slight muscle weakening during this period, the muscles quickly regain their former strength with the physical therapy and exercise programs started after the brace treatment.

Are MRI or X-ray scans harmful to children?

X-rays and CT scans use a low dose of radiation, but in modern machines, these doses have been reduced to minimum levels that do not threaten children's health. An MRI scan does not contain radiation; it uses a magnetic field and radio waves, making it a completely safe imaging method for children.

This article is for informational purposes only; please be sure to consult your physician for diagnosis and treatment. To make the best decision regarding your child's health, you can book an appointment.