The Three Column Concept of the Spine
Doctors often describe the spine using the three-column concept. This helps explain which parts of the spine are responsible for carrying weight and which structures may become painful.
The Anterior Column
The anterior column is located in the front of the spine. It includes the vertebral bodies, the spinal discs, and the front portion of the supporting ligaments. This column carries most of the body’s weight, especially while sitting.
The Middle Column
The middle column includes the back portion of the vertebral body, the back portion of the disc, and the ligaments that help support this area, as well as the nerves that travel through the spine. It serves as an important transition between the front and back of the spine.
The Posterior Column
The posterior column is located in the back of the spine. It contains facet joints, lamina, spinous processes, muscles, tendons, and many of the supporting ligaments. These structures help guide motion, provide stability, and protect the spinal nerves.
When you sit, especially for extended periods, much of your upper body weight shifts onto the anterior column. This increased pressure explains why the two most common causes of pain while sitting involve either the vertebral bodies or the spinal discs.
Vertebral Body Pain While Sitting
The vertebral bodies are the large bones stacked on top of one another that make up the front portion of the spine. Healthy vertebral bone usually does not hurt simply because it is under pressure.
Pain develops if there is a fracture in a vertebral body.
In younger people with healthy bones, this usually requires significant trauma such as a fall from a height, a serious sports injury, or a motor vehicle accident.
In older adults, especially those with osteoporosis, the situation is quite different. Osteoporosis weakens the bones by reducing their density. A compression fracture may occur during everyday activities such as bending over, lifting a light object, or sometimes without any obvious injury at all.
A vertebral compression fracture often causes sudden severe pain that becomes worse while sitting or standing because these positions place weight on the injured bone.
Fortunately, vertebral fractures account for only a small percentage of people who experience chronic low back pain while sitting.
Other Causes of Low Back Pain While Sitting
Although vertebral fractures and disc problems are common causes, several other conditions can produce pain while sitting.
These include muscle strain, ligament injuries, tumors, infections, and inflammatory conditions. Problems involving the hip joints can also create pain that feels like it is coming from the low back.
Because many different conditions can produce similar symptoms, making the correct diagnosis is extremely important before beginning treatment.
The Spine Disc Is Often the Real Source of Sitting Pain
For many people, the spinal disc is the true cause of pain while sitting.
The spinal disc acts as a cushion between two vertebral bones. Every disc functions like a shock absorber that allows the spine to bend, twist, and carry weight.
Each disc has two main parts.
The center is called the nucleus pulposus. This soft gel-like material helps distribute pressure evenly throughout the disc.
Surrounding the nucleus is the annulus fibrosus. The annulus is made of many strong layers of collagen fibers arranged in alternating directions. This design gives the disc both flexibility and strength.
Healthy discs absorb enormous forces throughout daily life. However, they are also exposed to millions of loading cycles over many years.
What Is Degenerative Disc Disease?
Degenerative disc disease is not actually a disease in the traditional sense. Instead, it describes the gradual wear and damage that occurs inside a spinal disc.
As people age, the nucleus slowly loses water content. The disc becomes less flexible and less able to absorb shock. The annulus also begins to weaken.
Tiny cracks called annular fissures may develop within the outer layers of the annulus.
These fissures are extremely important because they often become the true source of pain.
Why Sitting Makes Disc Pain Worse
Many people notice that their pain increases after sitting for prolonged periods.
This happens because sitting places greater pressure on the spinal discs than standing. Poor sitting posture increases this pressure even more.
Slouching causes the pelvis to rotate backward and the normal curve of the lower back to flatten. As this occurs, pressure shifts toward the back portion of the disc, also called the dorsal annulus.
This is the exact location where annular fissures commonly develop.
As the pressure repeatedly loads the damaged area, the fissures are stressed every time a person sits. This repeated compression often explains why sitting, driving, and prolonged desk work become increasingly uncomfortable.
Many patients notice that standing up or walking briefly relieves their symptoms because the pressure on the injured portion of the disc decreases.
The New Understanding of Discogenic Pain
For many years, doctors believed that spinal discs only caused pain when a bulging or herniated disc compressed a nearby spinal nerve.
Research has dramatically changed this understanding.
We now know that the outer portion of the annulus contains pain sensing nerve fibers. This means the disc itself can become painful even if no nerve is being pinched.
When annular fissures develop, inflammatory chemicals form within the damaged tissue. These chemicals irritate the pain fibers located in the outer annulus, producing what is known as discogenic pain.
This represents an important shift in the understanding of low back pain. A person may have severe pain while sitting even though there is little or no nerve compression visible on an MRI.
Why Disc Annulus Fissures Do Not Heal Well
One of the greatest challenges in treating disc pain is that spinal discs have an extremely limited blood supply.
Blood carries oxygen, nutrients, healing cells, and growth factors that repair injured tissues throughout the body.
Unfortunately, the inner portions of the spinal disc receive very little direct blood flow.
Because of this poor circulation, annular fissures have little natural ability to heal on their own. Instead of repairing completely, the damaged tissue often continues to weaken over time.
As degeneration progresses, additional fissures may form. The disc gradually loses height, becomes less stable, and produces increasing pain.
This explains why degenerative disc disease often becomes progressively worse if the underlying annular damage is not addressed.
A Nonsurgical Option for Disc Related Pain
Many people believe their only choices are to live with chronic pain or eventually undergo spine surgery.
Fortunately, another option exists for selected patients.
Discseel is a minimally invasive nonsurgical procedure designed to treat painful annular fissures. Rather than surgically removing part of the disc or fusing bones together, Discseel focuses on sealing damaged annular fissures using fibrin, an FDA approved biologic. The goal is to seal the fissures and stimulate healing within the damaged annulus.
Most patients searching for an alternative to spine surgery are simply unaware that this treatment exists.
If your back pain becomes worse while sitting and your symptoms appear to come from degenerative disc disease, learning more about Discseel may help you understand whether you are a candidate for this innovative treatment.
Do Not Ignore Low Back Pain While Sitting
Low back pain while sitting should never be dismissed as simply getting older. While muscle strain and arthritis can contribute to symptoms, many patients actually have painful annular fissures within their spinal discs. Because these fissures have truly little ability to heal on their own, the pain often becomes progressively worse over time.
Chronic spine pain affects nearly every part of daily life. It interferes with work, driving, travel, family activities, sleep, and exercise. The good news is that identifying the correct diagnosis opens the door to appropriate treatment.
A consultation with a properly trained spine specialist can help solve the mystery of low back pain while sitting. If you are searching for a nonsurgical solution to chronic disc related pain, learn more about Discseel.
If you are struggling with persistent low back pain, contact the Regenerative Spine & Joint Center today at (614) 389-3089 to schedule a consultation and begin your path toward relief.
