A compression fracture is a break in a vertebra (one of the bones stacking up to form your spine) where the bone collapses under pressure, losing height. These are the most common type of fracture linked to osteoporosis, and roughly two-thirds of them never get formally diagnosed. A 50-year-old white woman in the U.S. has a 16% lifetime risk of experiencing one, while a man of the same age and background has about a 5% risk.
How the Bone Actually Breaks
Your vertebrae are roughly cylindrical blocks of bone separated by discs. In a compression fracture, part or all of that block gets crushed down, like stepping on an empty soda can. This can happen in three patterns. In a wedge fracture, the front of the vertebra collapses while the back stays intact, creating a wedge shape. In a biconcave fracture, the top and bottom surfaces of the vertebra cave inward in the middle while the edges hold their shape. In a crush fracture, the entire vertebra loses height more or less uniformly.
A fracture is diagnosed on an X-ray when the vertebral body has lost at least 20% of its height, or has shrunk by 4 millimeters or more compared to its original size. Most compression fractures occur in the mid-to-lower back, particularly where the thoracic spine meets the lumbar spine.
What Causes Them
Osteoporosis is by far the leading cause. When bone density drops, vertebrae become fragile enough that everyday activities, a sneeze, bending to pick something up, or a minor stumble, can cause a fracture. A 10% loss of bone mass in the vertebrae doubles the risk. Globally, about 21% of women and 6% of men over 50 have osteoporosis, and the fracture rate climbs steeply with age in both sexes.
Cancer is the other major cause. Tumors that spread to the spine (most commonly from breast, lung, or prostate cancer) can eat away at bone and cause what’s called a pathologic fracture. Primary bone cancers and even benign bone tumors can do the same. In younger people without osteoporosis, a compression fracture typically results from high-energy trauma like a car accident or a fall from height.
Symptoms to Recognize
The hallmark is sudden back pain that gets worse when you stand or move and improves when you lie down. The pain usually centers around the level of the fracture and can range from mild to severe. Some people describe it as a sharp, stabbing sensation that came on during a specific movement. Others notice it building gradually over days without a clear triggering event.
Height loss is a telltale sign. Because the vertebra has physically collapsed, you may measure shorter than before. Over time, if multiple vertebrae fracture, you can lose several inches. This progressive collapse also changes your posture: the upper back rounds forward into what’s called kyphosis, the hunched appearance many people associate with aging.
That said, many compression fractures cause no pain at all. They show up incidentally on imaging done for another reason. This is a big part of why an estimated two-thirds of vertebral fractures go undiagnosed.
Long-Term Effects of Untreated Fractures
A single compression fracture may heal without lasting problems, but it significantly raises the odds of another one. A 65-year-old woman with one vertebral fracture has a one-in-four chance of sustaining another within five years. Each additional fracture compounds the postural changes and the symptoms that come with them.
As the spine curves forward and height is lost, the rib cage presses down toward the pelvis. This reduces the space in your chest, making exercise harder and breathing less efficient. The compressed abdominal space can cause early fullness when eating, leading to unintentional weight loss. People with multiple fractures often develop chronic pain, sleep problems, difficulty with basic self-care tasks, and depression. The psychological toll is real: studies document distorted body image, loss of self-esteem, and persistent fear of falling or fracturing again.
How It’s Diagnosed
A standard lateral X-ray of the spine is usually the first step. It can confirm the fracture and show the shape of the collapse, but X-rays alone often can’t tell you whether the fracture happened last week or last year, or whether it was caused by osteoporosis or something more concerning like cancer.
MRI fills in those gaps. Fluid-sensitive MRI sequences detect bone marrow swelling, which signals a recent fracture. That swelling typically fades within one to three months, so its presence or absence helps pin down when the fracture occurred. MRI can also distinguish between a fracture caused by fragile bones and one caused by a tumor, which is critical for guiding treatment. CT scans are used when the fracture may extend into the back of the vertebra or when there’s concern about the spinal cord being compressed. Comparing new images with any prior imaging is one of the most reliable ways to determine whether a fracture is new.
Treatment Without Surgery
Most compression fractures heal on their own in about three months. The main goals during that time are controlling pain and preventing further fractures. Your doctor will typically recommend a combination of rest (especially in the first few days), gradual return to activity, and pain medication. A rigid or semi-rigid back brace is sometimes prescribed to limit spinal motion while the bone heals.
If you don’t have a physically demanding job, you may not need to miss work at all during recovery. Activity modification matters more than bed rest. Prolonged immobility actually accelerates bone loss and weakens the muscles that support your spine, so staying as active as pain allows is important.
Surgical Options and Their Limitations
Two procedures are commonly discussed for compression fractures: vertebroplasty (injecting bone cement directly into the fractured vertebra) and kyphoplasty (inflating a small balloon inside the vertebra first, then filling the space with cement). Both are minimally invasive and performed through a needle inserted into the back.
The evidence for these procedures, however, is not strong. A task force from the American Society for Bone and Mineral Research reviewed the available trials and found that vertebroplasty provides no clearly significant pain benefit over a sham (placebo) procedure across five randomized controlled trials. For kyphoplasty, no placebo-controlled trials exist, and head-to-head comparisons show no advantage over vertebroplasty. Patients who had either procedure may have experienced short-term pain relief, but there was no meaningful long-term improvement in pain, disability, or quality of life compared with those who skipped surgery. The task force recommends that patients be fully informed of this evidence before making a decision.
Preventing the First (or Next) Fracture
Because treatment with anti-osteoporosis medication can cut the risk of a subsequent fracture in half (from one in four over five years down to one in eight), starting or continuing bone-protective therapy is the single most impactful step after a compression fracture. The most commonly prescribed medications are bisphosphonates, a class of drugs that slow bone breakdown. These come as weekly or monthly pills, or as infusions given quarterly or annually. For people who can’t tolerate bisphosphonates, an injectable medication given every six months is an alternative.
Getting adequate calcium and vitamin D supports bone maintenance and helps these medications work effectively. Weight-bearing exercise, balance training to prevent falls, and avoiding tobacco and excessive alcohol all contribute to keeping bones stronger as you age. If you’ve already had one compression fracture, these measures aren’t optional extras. They’re the most effective way to avoid a cascade of fractures that progressively reshapes your spine and limits your daily life.