Osteoarthritis of the spine is a degenerative condition where the cartilage in your spinal joints gradually breaks down, leading to pain, stiffness, and reduced mobility. It most commonly affects the facet joints, small paired joints that connect each vertebra and allow your spine to bend and twist. You may also hear it called spondylosis, which is simply another term for the same process.
What Happens Inside the Spine
Your spine has two main types of connections between vertebrae: the spongy discs in front that absorb shock, and the facet joints in back that guide movement. These facet joints are lined with smooth cartilage and surrounded by a fluid-filled capsule, just like your knees or hips. When osteoarthritis develops, the cartilage in these joints thins and roughens, and the underlying bone responds by hardening and forming bony growths called bone spurs (osteophytes).
Unlike a single injury, this is a whole-joint process. The joint capsule can calcify, the surrounding ligaments thicken, and the bony surfaces enlarge. Over time, these changes narrow the space within the joint and can encroach on nearby nerve pathways. The lumbar spine (lower back) and cervical spine (neck) are the most commonly affected areas because they bear the most load and allow the most movement.
Common Symptoms
The hallmark of spinal osteoarthritis is stiffness and aching that tends to be worst after periods of inactivity, particularly in the morning. Research on people with lumbar degenerative changes found that morning stiffness lasting longer than 30 minutes was significantly associated with the presence of bone spurs and disc space narrowing. As the severity of the stiffness increased, so did the likelihood of visible structural changes on imaging.
Pain typically centers in the neck or lower back and may feel deep and achy rather than sharp. It often worsens with extension (leaning backward) or prolonged standing and improves with gentle movement. Some people notice a grinding or crunching sensation when they twist. If enlarged joints or bone spurs press on nearby nerves, you might also experience radiating pain, numbness, or tingling into an arm or leg, depending on which part of the spine is affected.
How It Leads to Spinal Stenosis
One of the most important complications to understand is spinal stenosis, a narrowing of the channels through which nerves travel. As facet joints enlarge and bone spurs proliferate, they can squeeze the lateral recesses of the spinal canal, the small side corridors where nerve roots pass before exiting the spine. Thickening of the ligaments that run along the back of the spinal canal adds to the crowding.
This doesn’t happen overnight. Stenosis develops gradually over years, and many people have some degree of narrowing without symptoms. When it does cause problems, the classic pattern in the lower back is pain or heaviness in the legs that worsens with walking and eases when you sit down or lean forward. In the neck, it can cause hand clumsiness or balance problems if the spinal cord itself becomes compressed.
How It’s Diagnosed
Diagnosis starts with your symptoms and a physical exam, but imaging confirms the structural changes. Standard X-rays can reveal the key markers: bone spurs at joint margins, narrowing of the joint space, and hardening (sclerosis) of the bone beneath the cartilage. Doctors often grade severity using the Kellgren-Lawrence scale, which runs from 0 (no changes) to 4 (large bone spurs, marked joint space narrowing, and deformity of the bone surfaces). Grade 2, where definite bone spurs appear with possible joint narrowing, is generally the threshold for a formal osteoarthritis diagnosis.
MRI is used when nerve involvement is suspected, because it shows soft tissues that X-rays miss: cartilage condition, disc bulging, ligament thickening, and how much space the nerves actually have. It’s worth knowing that imaging findings don’t always match symptoms. Many people over 50 have visible spinal osteoarthritis on scans but experience little or no pain, which is why doctors treat the person, not the picture.
Who Gets It and Why
Age is the single biggest risk factor. The facet joints endure decades of repetitive loading, and cartilage has limited ability to repair itself. By age 60, some degree of spinal osteoarthritis is nearly universal on imaging, though only a fraction of people develop significant symptoms.
Excess body weight accelerates the process, particularly in the lower back. Carrying extra weight increases compressive forces on the lumbar spine and, somewhat counterintuitively, reduces relative muscle strength. When researchers measured core and back muscle strength relative to body mass, obese individuals consistently had lower functional strength than their normal-weight counterparts. Previous spinal injuries, repetitive heavy lifting, genetics, and smoking also raise risk.
Managing Pain and Maintaining Function
There is no way to reverse cartilage loss, but the pain and disability from spinal osteoarthritis respond well to a combination of movement, weight management, and targeted treatments.
Exercise and Physical Therapy
Regular movement is the single most effective long-term strategy. Strengthening the muscles that support the spine, particularly the deep core muscles and the muscles along the back, reduces the load on damaged joints and improves stability. Low-impact activities like walking, swimming, and cycling keep joints mobile without excessive pounding. A physical therapist can identify specific movement patterns that aggravate your symptoms and design a program around them.
Stretching matters too. Tight hip flexors and hamstrings change how your pelvis sits, which shifts extra stress onto the lumbar facet joints. Consistent flexibility work in these areas can meaningfully reduce back pain over time.
Weight Loss
For people carrying extra weight, losing it produces some of the most dramatic improvements. In studies of morbidly obese patients who underwent weight-loss surgery, back pain symptoms improved in 82 to 90 percent of patients within 6 to 22 months. The severity of back pain dropped by 44 percent in people with chronic debilitating symptoms. While surgical weight loss produces the most studied results, the mechanism is the same regardless of how you lose the weight: lower compressive forces on the spine, reduced inflammation, and better functional strength.
Pain Relief Options
Over-the-counter anti-inflammatory medications can help during flare-ups. Heat and ice provide temporary relief, with heat generally working better for the chronic stiffness of osteoarthritis. For more persistent pain, doctors may recommend injections into the facet joint or the nerves that supply it, which can provide weeks to months of relief and help confirm that the facet joint is the pain source. If a specific nerve branch is identified as the pain driver, a procedure that uses heat to interrupt the nerve signal can provide longer-lasting relief, often six months to a year or more.
What to Expect Over Time
Spinal osteoarthritis is a progressive condition, but “progressive” doesn’t mean inevitably disabling. Many people experience periods of flare and remission, and the severity of structural changes on imaging correlates poorly with how much pain someone actually feels. People who stay active, maintain a healthy weight, and build strong supporting muscles consistently do better than those who become sedentary out of fear of making things worse. The spine is remarkably adaptable, and even joints with significant arthritis can function well when the surrounding muscles are doing their share of the work.