Facet syndrome is pain at the joint between two vertebrae in your spine. Another term for facet joint syndrome is osteoarthritis.
The facet joints are the joints in your spine that make your back flexible and enable you to bend and twist. Nerves exit your spinal cord through these joints on their way to other parts of your body. Healthy facet joints have cartilage, which allows your vertebrae to move smoothly against each other without grinding. Each joint is lubricated with synovial fluid for additional protection against wear and tear.
When your facet joints become swollen and painful due to osteoarthritis, it is called facet joint syndrome.
Facet joint syndrome can be caused by a combination of aging, pressure overload of your facet joints, and injury.
Pressure overload on your facet joints is probably caused by degeneration of the intervertebral discs in your spine. As the discs degenerate, they wear down and begin to collapse. This narrows the space between each vertebra. This narrowing of the space between each vertebra affects the way your facet joints line up. When this occurs, it places too much pressure on the articular cartilage surface of the facet joint. The excessive pressure leads to damage of the articular surface and eventually the cartilage begins to wear away.
When facet joint arthritis gets bad enough, the cartilage and fluid that lubricate the facet joints are eventually destroyed as well, leaving bone rubbing on bone. Bone spurs begin to form around the facet joints. When bone spurs develop, they can take up space in the foramen (the opening between vertebrae where nerve roots exit the spine) and press into nerve roots. As the bone spurs begin to grow larger, they can eventually extend into the spinal canal itself. This leads to narrowing of your spinal canal, called spinal stenosis.
Patients with facet joint syndrome have difficulty twisting and bending their spine. If you have facet joint syndrome in your cervical spine (your neck), you may have to turn your entire body to look left or right. Facet joint syndrome in your lumbar spine (low back) may make it difficult for you to straighten your back or get up out of a chair.
Pain, numbness, and muscle weakness associated with facet joint syndrome will affect different parts of your body depending on which of your nerves are being affected. If the nerves affected are in your cervical spine, you may have symptoms in your neck, shoulders, arms and hands. If the nerves are in your lumbar spine you may have symptoms in your buttocks, legs, and feet.
The diagnosis of facet joint syndrome usually begins with a complete history and physical exam. Your doctor may order other diagnostic tests as well. X-rays may be recommended to determine whether there are abnormalities in your spine. A CT scan can sometimes show more detail about your facet joint surfaces. If the X-rays suggest something may be affecting your facet joints, your doctor may recommend a CT scan to get a better look. A bone scan can be useful in determining whether your facet joints are inflamed. An inflamed facet joint usually shows up as a hot spot on a bone scan.