Spinal distortions can occur and relate to an abnormal alignment or curve of the bony vertebral column. Adult scoliosis and kyphosis can be caused by age-related wear and tear on the back or complications from past surgeries. Moderate deformity occurs when the facet joints (joints in the spine) and discs deteriorate over time and are no longer able to support the spine’s normal posture. Pain results from stressed joints and pinched nerves, not the abnormal curve.
Anatomy of the spine
The spine is a column of 24 moveable bones called vertebrae that are connected to one another by ligaments. The bones are separated by discs, which act as shock absorbers and give the spine flexibility. Each vertebra has a three-joint complex with a large disc in the front and two facet joints in the back. This strong, tripod design keeps the bones connected and aligned, one on top of the other, while allowing our spine to bend and twist.
Figure 1. Front and side views of the body show normal alignment of the spine bones and the natural curves.
When viewed from the front, the spine is perfectly straight, but from the side it has three curves (Fig. 1). This curvature absorbs the shock of footsteps and positions our head naturally over the pelvis and hip. At the neck, or cervical level, the normal spine arches slightly inward toward the jaw in a curvature called lordosis. The spine arches out slightly at the chest level (kyphosis), and it curves inward again (lordosis) at lumbar level, or lower back.
What are spinal distortions?
Spinal alignment and curvature can be altered in many ways. They can occur as a result of a birth defect, a child’s growth, aging, injury, or previous spine surgery. The most common type of spinal distortion in adults is degenerative scoliosis.
Figure 2. Types of spinal distortions: A side-to-side curve is called scoliosis; a forward curve (kyphosis) shifts the centre of balance in front of the hip; a concave lower back (lordosis) thrusts the hip forward.
Scoliosis is a side-to-side curvature of the spine that can develop in adults when their facet joints and discs begin to deteriorate (Fig.2). The facet joints give the spine flexibility, enabling us to twist, stretch, or curl up on the couch. When these joints deteriorate, the spine bones can tilt and begin to shift to one side.
Kyphosis is an abnormal forward rounding (more that 50 degrees of curvature) of the spine. In the upper (thoracic) back, kyphosis is commonly due to osteoporotic compression fractures. It can also occur in the lower (lumbar) spine. It limits function and results in a common complaint among older people: “I can’t stand up straight.” Another common scenario is a patient who has previously had one or more spine surgeries. These patients can develop what is called “flat back syndrome,” which means they have lost some of the natural lordosis (inward curvature) of their lower spine. A patient who has had a previous lumbar fusion may develop a junctional kyphosis. In this situation, the spine has weakened right above the fusion, causing the patient’s posture to bend forward.
Also called swayback, lordosis is a condition in which the spine curves significantly inward at the lower back, giving a backward leaning appearance.
What are the symptoms?
Scoliosis is not a single disease. It falls along a spectrum, from mild to moderate to severe. Symptoms include pain or stiffness in the mid-to-lower back, and numbness or weakness in the legs or feet. Not all adults with degenerative scoliosis experience pain. When pain does occur, a pinched nerve is typically the cause, not the curvature.
In more severe cases, scoliosis can cause shooting pain down the leg (sciatica), an inability to stand up straight, and an inability to walk more than a short distance. Symptoms of severe, progressive scoliosis are similar to those of stenosis, but with visible spinal imbalance. This imbalance can result in strain on the hips and knees, the inability to walk in a straight line, and falls.
Patients with kyphosis have lost their ability to stand up straight. Hunched over while standing, they may become quickly fatigued and have difficulty talking to others or maintaining eye contact. They may also have difficulty lying flat.
Figure 3. Degenerative discs and facet joints can cause the column of bones to tilt, rotate, and slip (listhesis). Foraminal stenosis occurs on the inside of the tilt and pinches the nerve.
What are the causes?
As you get older, your bones undergo degenerative changes that are part of the natural aging process. When joints deteriorate, arthritis can develop, and the spinal column can shift sideways. Other conditions that might cause degeneration include:
• Arthritis from degenerative discs and facet joint syndrome, resulting in the loss of normal vertebral alignment (Fig. 3).
• Osteoporosis (loss of bone mass) and vertebral compression fractures.
• Previous spine surgery (adjacent level disease). The passage of time after a spine surgery is a leading cause of spinal distortion.
The aging of joints, combined with a fracture at a level above the previous fusion, can also cause a significant distortion. Simply removing material from the sine can cause a problem down the road. It may reduce or eliminate pain in the near term, but symptoms can return later because of instability of the spine. Think of the game, Jenga. When you remove a block from the tower, other blocks can be affected. Like the Jenga tower, what goes on globally in the spinal balance and pathology is important.
Who is affected?
Mild to moderate spinal deformity is common in older adults, but it can also affect adults in their 50’s and younger. An estimated 60% of people over age 60 may have mild degenerative scoliosis.
How is a diagnosis made?
Diagnostic tests include a physician examination, x-rays, CT scan, MRI, or myelogram.
Figure 4. Standing scoliosis X-rays of the spine show misalignment of the bones.
X-rays create images of the bones in your spine and show whether any of them are too close together or whether you have arthritic changes, bone spurs, fractures, or slippage of the vertebrae. Special flexion and extension x-rays will be taken to measure misalignment of the bones and curve regression.
Computed Tomography (CT) scan is a non-invasive test that uses an x-ray beam and a computer to make 2-dimensional images of your spine. It may or may not be performed with a dye (contrast agent) injected into your bloodstream. It is useful for viewing changes in bony structures.
Magnetic resonance imaging (MRI) scan is a non-invasive test that uses a magnetic field and radiofrequency waves to give a detailed view of the soft tissues of your spine. Unlike an x-ray, nerves and discs are clearly visible. It may or may not be performed with a dye (contrast agent) injected into your bloodstream. MRI is useful in evaluating soft-tissue damage to the ligaments and discs and assessing spinal cord injury.
Myelogram is a specialised X-ray where contrast dye is injected into the spinal canal. A fluoroscope then records the images formed by the dye. Myelograms can show a nerve being pinched by a disc, bony overgrowth, or stenosis. The dye gives a picture of the spinal canal, spinal cord, and nerves in detail. A CT scan follows the test.
What treatments are available?
Treatment for mild to moderate spine deformity in adults is determined by the severity of the symptoms, not the size of the curve. It begins with a trail period of pain management, physical therapy, and nonsurgical options. If pain is caused by inflammation of the facet joints, treatment involves facet joint therapy. If the curvature is mild, the deformity is not treated. If the curvature is severe, complex spinal surgery may be recommended. Barring serious “red flags,” such as a neurologic impairment, conservative care is used for 3 to 6 months before surgery is considered.
Self-care: Using correct posture and keeping your spine in alignment are the most important things you can do for your back. The lower back (lumbar curve) bears most of your weight, so proper alignment of this section can prevent injury to your vertebrae and discs. You may need to make adjustments to your daily standing, sitting, and sleeping habits. You may also need to learn proper ways to lift and bend. If you smoke or are overweight, you may be able to reduce your symptoms by quitting smoking and/or achieving a healthy weight appropriate for your body frame.
Bone density: Because good bone density reduces the risk of fractures in aging adults, you may be asked to undergo a bone-density scan to determine the strength of your bones. If osteoporosis is detected, your risk of a fracture to your spine is increased because your bones have weakened and become more brittle. Your doctor may prescribe a medication that slows bone loss.
Chiropractic therapies: Exercise and strengthening exercises are key elements to your treatment and should become part of your life-long fitness. Chiropractors can instruct you on proper lifting and walking techniques, and they will work with you to strengthen your back, leg, and stomach muscles. They will also encourage you to stretch and increase the flexibility of your spine and legs. Check with your chiropractor before you begin any new exercise program and be sure to see a physical therapist who specialises in spine rehabilitation.
Medication: Over-the-counter and prescription medications can help you cope with back pain.
• Nonsteroidal anti-inflammatory drugs (NSAIDs), such as aspirin, naproxen, and ibuprofen are used to reduce inflammation and relieve pain.
• Analgesics can relieve pain but do not have the anti-inflammatory effects of NSAIDs. Long-term use of analgesics and NSAIDs may cause stomach ulcers as well as kidney and liver problems.
• Steroids reduce the swelling and inflammation of the nerves. They are taken orally in a tapering dosage over a 5-day period. They have the advantage of providing pain relief within a 24-hour period.
• Epidural steroid injection (ESI): This minimally invasive procedure involves an injection of corticosteroid and an analgesic-numbing agent into the epidural space of the spine to reduce the swelling of the spinal nerves. Many patients have some relief after an ESI, although the results tend to be temporary. If injections are helpful, they can be repeated.
• Facet injection: This minimally invasive procedure involves an injection of corticosteroid and an analgesic-numbing agent into the painful facet joint.
Bracing: Wearing a brace is often used for childhood scoliosis, but it will not straighten the adult spine. A brace may help reduce pain in the short-term, but it also will allow the muscles to get weaker, eventually leading to more back pain.
Surgery: Surgical options vary depending on the severity of the symptoms. The number of levels affected, and the type of deformity. A combination of different fusion and instrumentation techniques are used to treat the patient’s specific condition.
• Decompression: If the scoliosis is mild and is causing a pinched nerve at one level, only that level is treated with a laminectomy.
• Fusion: A patient suffering from foraminal stenosis and scoliosis usually requires a fusion to restore disc height when a vertebra has collapsed on a nerve. Fusion makes the vertebrae square in relation to each other and restores proper alignment. It involves joining two vertebrae with a bone graft (Fig. 5), which is held together with hardware that could include plates, rods, hooks, pedicle screws, or cages. The goal of the bone graft is to join the vertebrae above and below to form one solid piece of bone. Creating a solid fusion may take several months or longer.
Figure 5. A transforaminal lumbar interbody fusion (TLIF) replaces the disc with a bone graft and immobilises the bones with pedicle screws and rods.
• Minimally invasive fusion: A lateral lumbar interbody fusion surgery is an option for some patients with scoliosis (Fig. 6). The surgeon operates through a tube incision at the waist and avoids cutting the back muscles.
Figure 6. A lateral fusion (LLIF) for moderate scoliosis restores the normal tilt and height of the disc space. Over time the two vertebrae will fuse together.
• Spinal reconstruction: Complex deformities and kyphosis often require the cutting of bone (osteotomy) and stabilisation with long rods and screws in staged operations.
Idiopathic scoliosis: abnormal spine curvature in teens due to genetics or bone growth
Degenerative scoliosis: abnormal spine curvature in adults due to aging of discs and joints
Schwab F, Dubey A, Gamez L, et al. Adult scoliosis: prevalence, SF-36, and nutritional parameters in an elderly volunteer population. Spine 30 (9): 1082-5, 2005
Robert Bohinski, MD, PhD and Zachary Tempel, MD
Cannington Chiro Services
Patients attending Cannington Chiro help us by first filling out a “New Patient Questionnaire”, followed by a thorough consultation, examination, and assessment. This helps us help you.
Beginning treatment ASAP is a priority to us, with the aim of, in most cases, commencing treatment from day one. Healing, repair and rehabilitating the body after being injured is a process – and processes take time – so with understanding and patience a positive long-term outcome can be expected.
We look forward to helping you and demonstrating that we may be the missing link in your recovery.