When your lowest ribs press against the top of your hip bones, it usually means the space between your rib cage and pelvis has shrunk. In a healthy spine, there is a clear gap between the bottom of the rib cage and the iliac crests (the bony ridges you feel at the top of your hips). That gap closes when the spine loses height or curves abnormally, and the resulting bone-on-bone contact has a medical name: iliocostal impingement syndrome. It can be painless for some people and deeply uncomfortable for others, depending on the cause and severity.
What Normally Keeps Ribs and Hips Apart
Your 11th and 12th ribs, the “floating” ribs, sit at the bottom of your rib cage. Below them, a stretch of soft tissue, muscle, and the lumbar spine creates a gap before you reach the top of the pelvis. The height of your lumbar vertebrae and the natural curves of your spine maintain that space. Anything that compresses, shortens, or distorts the lumbar region can close the gap and bring those lowest ribs into direct contact with the hip bones.
Common Causes of Rib-to-Hip Contact
Spinal Compression From Osteoporosis
Osteoporosis is the most frequent driver, especially in older women. When vertebrae weaken, they can shrink and flatten, sometimes fracturing under the stress of everyday movement. As multiple vertebrae compress over time, the spine loses measurable height. This shortening pulls the rib cage downward toward the pelvis. In advanced cases, the vertebrae flatten enough to produce a severely rounded upper back, sometimes called a dowager’s hump, which tilts the entire trunk forward and further narrows the rib-to-hip distance.
Kyphosis and Scoliosis
An exaggerated forward curve of the upper spine (thoracic hyperkyphosis) pushes the lower ribs closer to the pelvis from the front. Scoliosis, a lateral curve, does something slightly different: it shifts the ribs toward the hip bones on one side only. A study of 38 women diagnosed with iliocostal impingement found that every patient had either hyperkyphosis, kyphoscoliosis (a combination of both curve types), or both. The one-sided nature of scoliosis explains why some people feel the contact only on their left or right side.
Degenerative Disc Disease and Height Loss
Even without osteoporosis, the discs between your vertebrae naturally lose water content and thickness with age. If several lumbar discs thin significantly, the cumulative height loss can be enough to close the gap. This process is gradual, which is why many people first notice rib-hip contact in their 60s or 70s, though it can happen earlier with accelerated disc degeneration.
Short Torso or Naturally Low-Set Ribs
Some people notice their ribs touching their hips without any spinal disease at all. A naturally short torso or low-set floating ribs can mean minimal space to begin with. In these cases, the contact often becomes noticeable only in certain positions, like bending sideways or sitting slumped, and may never cause pain.
What It Feels Like
When the ribs actually impinge on the iliac crest, the main complaint is pain in the lower back, flank, or waist area. The pain tends to worsen with movements that compress the space further: bending to the side, sitting without support, or standing for long periods. Some people describe a clicking or grinding sensation as the rib slides against the pelvic bone. Others feel a deep ache along the side of the torso that is hard to pinpoint.
The discomfort often gets dismissed as generic back pain, which is part of why iliocostal impingement is underdiagnosed. If you have a visibly curved spine or have lost noticeable height over the years, the combination of those changes with flank or waist-level pain is a strong signal that rib-hip contact is the source.
How It Is Diagnosed
A standing X-ray of the spine is typically all that’s needed. Your doctor will look at the distance between the lowest rib and the iliac crest, the degree of any spinal curvature, and whether vertebral compression fractures are present. In some cases, a physical exam alone reveals the problem: pressing into the space between the ribs and the pelvis reproduces the pain, or the clinician can feel the bones making contact when you bend sideways.
Treatment Without Surgery
Weighted Posture Training
One of the most effective conservative approaches uses a small weighted device worn on the upper back, called a weighted kypho-orthosis. It’s essentially a lightweight backpack-style pouch (typically 1.75 to 2.5 pounds) positioned between the shoulder blades. The weight acts as a cue that encourages the back muscles to straighten the spine, which lifts the rib cage away from the pelvis. In a case series of 38 women with iliocostal impingement, every patient reported immediate pain reduction when first trying this device. Patients who returned for follow-up within two years all maintained their pain relief and showed posture improvement.
The recommended starting routine is 30 minutes of wear twice daily, paired with a home exercise program. Once the exercises become habit and pain stays manageable, many people reduce or stop using the device.
Back Strengthening and Stretching
The exercise component focuses on strengthening the muscles that run along the spine (the back extensors) combined with stretching the chest, shoulders, back, and hip girdle. These are done seated, usually 10 repetitions of each exercise, twice a day. The goal is to improve the spine’s ability to hold itself upright, which directly increases the rib-to-hip gap. Strengthening alone won’t reverse bone loss or structural curvature, but it can meaningfully reduce how much the ribs press into the pelvis during daily activity.
Rib Compression Belts
A 3-inch wide compression belt fitted directly above the iliac crests is another option. Tightened snugly, it applies pressure to the lower ribs and pushes them inward, away from the hip bones. This provides quick relief for some people, particularly during activities that aggravate the contact, though it treats the symptom rather than the underlying cause.
Pain-Relieving Injections
When the pain is severe or doesn’t respond to physical approaches, injections of a local anesthetic (sometimes combined with a corticosteroid) into the area where the rib meets the pelvis can help. These typically provide relief lasting a few weeks to a few months, giving a window to make progress with strengthening and posture work. They are not a long-term fix on their own.
When Surgery Is Considered
Surgical removal of the lowest rib or ribs (rib resection) is a last resort, reserved for people with significant pain who have not responded to conservative treatment. The procedure eliminates the physical contact by removing the bone doing the impinging. It is uncommon because most patients improve with posture correction and exercise, but it remains an option for severe cases where the structural anatomy leaves no other way to create space.
Practical Steps for Daily Comfort
If you’re living with rib-hip contact, a few adjustments can reduce how often the bones meet. Sitting with lumbar support, even a rolled towel behind your lower back, helps maintain the natural curve of the spine and keeps the rib cage lifted. Avoid prolonged slouching, which collapses the very space you’re trying to preserve. When standing for long periods, shifting your weight or placing one foot on a low step can tilt the pelvis slightly and open up the gap on the compressed side.
Side-sleeping often worsens the contact on whichever side is down. Placing a firm pillow between your waist and the mattress fills the gap and prevents the ribs from sinking into the pelvis. For people whose impingement is driven by osteoporosis, addressing the bone loss itself through calcium, vitamin D, and appropriate medication slows further vertebral compression and helps prevent the problem from getting worse over time.