Pain along the top of the ilium, the bony ridge you can feel at the top of your hip, usually comes from the muscles, ligaments, or nerves that attach to it rather than from the bone itself. The iliac crest is one of the body’s busiest skeletal landmarks: abdominal muscles, hip muscles, a thick band of connective tissue running down your thigh, and several small sensory nerves all converge there. That concentration of structures means many different problems can produce pain in the same spot, and the specific cause depends heavily on your age, activity level, and whether the pain came on suddenly or crept up over weeks.
Muscle Strains and Tears Along the Crest
The internal and external oblique muscles and the transversus abdominis all anchor to the iliac crest. When people hear “side strain,” they usually think of rib-level injuries, but these same muscles can be strained or torn right where they attach to the pelvis. This pattern is less commonly described in the medical literature, though it has been documented in athletes like cricketers who rotate their trunks forcefully during bowling or throwing.
In professional soccer players, avulsion of the internal oblique at the iliac crest, where the muscle literally pulls away from the bone, has been treated surgically with good results. In a small case series, athletes who underwent surgical repair began sport-specific training about six weeks after the operation and returned to full, unrestricted competition within two to four months.1PubMed Central. Successful Repair of M. obliquus Internus Abdominis Avulsion at the Iliac Crest—Operative Technique in Professional Soccer Players Most people with milder strains at this site never need surgery, but the injury is easy to miss because clinicians tend to look at the ribs first when they suspect a side strain.
The gluteus medius, one of the main muscles responsible for stabilizing your pelvis when you walk or stand on one leg, also attaches along the outer surface of the iliac crest.2PM&R. Atypical Cause of Lateral Hip Pain Due to Proximal Gluteus Medius Muscle Tear: A Report of 2 Cases Tears or tendinopathy near this attachment can produce pain along the upper hip that gets confused with trochanteric bursitis or lower back problems. If your pain is more toward the outer side of the crest and worsens when you climb stairs or lie on that side, the gluteus medius is worth considering.
Superior Cluneal Nerve Entrapment
One of the most frequently overlooked causes of iliac crest pain is entrapment of the superior cluneal nerves. These are small sensory nerves that cross over the posterior iliac crest, the back part of the ridge, on their way to the skin of the buttock. If they become pinched where they pass through a narrow tunnel of connective tissue at the crest, they produce a burning, aching pain right at the bone that can radiate into the buttock or even down the leg. It feels a lot like a disc problem, and many people go through rounds of imaging and treatment for their spine before anyone checks this nerve.
This is not as rare as it sounds. One study found that in patients with chronic low back pain, superior cluneal nerve entrapment is “not a rare cause and is often overlooked,” and that raising awareness could prevent unnecessary surgical or non-surgical treatments directed at the wrong structure.3PubMed. The frequency of superior cluneal nerve entrapment diagnosed with ultrasound-guided nerve block in patients with low back pain: A prospective, cross-sectional study A case report of an 81-year-old woman illustrates the typical presentation: tenderness at the middle of the posterior iliac crest with burning sensations around the tender point and no other neurological findings. A local anesthetic injection at the site relieved the pain and confirmed the diagnosis.4PubMed Central. Superior cluneal nerve entrapment syndrome: a common but often overlooked cause of low back pain Some estimates put the prevalence as high as 14% among people with low back pain, which is striking for a condition most people have never heard of.
A hallmark clue is point tenderness right at the back of the iliac crest, sometimes with a Tinel-like response, a shooting or tingling sensation when the spot is tapped. If pressing on a specific point along the posterior crest reproduces your pain, mentioning superior cluneal nerve entrapment to your doctor can save a lot of diagnostic wandering.
Treatment for Cluneal Nerve Problems
The first-line treatment is usually a nerve block: a small injection of local anesthetic, sometimes combined with a corticosteroid, delivered under ultrasound guidance right where the nerve crosses the crest. This serves double duty as both a diagnostic test and a therapy. If the pain disappears after the injection, that confirms the nerve is the problem.5Journal of Bodywork and Movement Therapies. Evaluation of the efficacy of Superior Cluneal Nerve Block in low back pain: A prospective observational study
When injections provide only temporary relief and the pain keeps returning, other options include radiofrequency ablation, which uses heat to interrupt the nerve signal, peripheral nerve stimulation, and surgical decompression where the tight band of tissue compressing the nerve is released. A systematic review and meta-analysis found that surgical decompression had the highest pooled response rate at about 93%, followed by peripheral nerve stimulation at roughly 80%, radiofrequency ablation around 75%, and injection therapy at about 72%.6PubMed Central. Treatment outcomes for cluneal neuropathy: a systematic review and meta-analysis Those numbers suggest the condition responds well to targeted treatment once it is correctly identified, which makes the diagnostic delay most patients experience all the more frustrating.
Iliolumbar Ligament Syndrome
The iliolumbar ligament runs from the lowest lumbar vertebrae to the inner surface of the iliac crest. It helps stabilize the junction between the spine and the pelvis, and when it is strained or develops enthesopathy, meaning irritation where it inserts into bone, the result is deep pain near the top of the ilium that often gets lumped in with “nonspecific low back pain.” An anatomical study noted that the posterior band of the iliolumbar ligament has a relatively narrow insertion area on the iliac crest, which gives it less mechanical resilience and may explain why painful syndromes at this site are relatively common.7PubMed. Iliolumbar ligament insertions. In vivo anatomic study
One study of 57 patients with suspected iliolumbar syndrome used ultrasound-guided diagnostic injections to confirm the diagnosis in about 79% of them. Those patients then received ultrasound-guided platelet-rich plasma injections into the ligament, and the vast majority, over 93%, showed both a reduction in pain and a measurable decrease in ligament thickening after six weeks.8PubMed Central. Recovering from nonspecific low back pain despair: Ultrasound-guided intervention in iliolumbar syndrome The study’s title captures something real about this condition: patients with iliolumbar syndrome often cycle through generic low-back-pain treatments for months before the specific ligament is identified.
Adolescent Apophyseal Injuries
If you are a teenager or the parent of one, iliac crest pain has a specific cause worth knowing about. In growing athletes, the iliac crest has a growth plate, called the apophysis, that has not yet fused to the main bone. This cartilaginous zone is the weakest link in the chain, so when a forceful contraction of the oblique or tensor fasciae latae muscles occurs, the growth plate can become inflamed (apophysitis) or even fracture and pull away (avulsion).
The mean age for pelvic apophyseal avulsions is about 14.5 years, and iliac crest avulsions specifically tend to happen during sudden trunk rotation while sprinting. They account for only about 1% to 2% of all pelvic apophyseal fractures, making them uncommon but not unheard of in sports like gymnastics, wrestling, and football.9PubMed Central. Iliac Apophysitis in a High School Football Player: A Case Report A case in a 15-year-old indoor soccer player showed that CT imaging revealed not only an acute avulsion but evidence of chronic stress on the apophysis that had been building before the final event.10PubMed Central. Acute Avulsion of the Iliac Crest Apophysis in an Adolescent Indoor Soccer In other words, these injuries do not always come out of nowhere; the growth plate may be gradually weakening from repeated stress before a single forceful movement finishes the job.
Most iliac crest apophyseal injuries heal without surgery. Rest, activity modification, and a gradual return to sport are the standard approach. The main concern is making the correct diagnosis early, because adolescent athletes who are told they just have a muscle strain may try to push through the pain and worsen the injury.
Stress Fractures of the Iliac Bone
Stress fractures in the pelvis tend to show up in the pubic rami or the sacrum, but the iliac wing itself can fracture from repetitive loading, particularly in distance runners. These fractures are rare, representing about 4% of pelvic stress fractures, and they have historically been reported more in female runners, often in association with relative energy deficiency in sport.11PM&R. Unusual Iliac Crest Stress Fracture in a Marathoner: A Case Presentation However, at least one case of consecutive bilateral iliac stress fractures has been documented in an adult male runner, so the problem is not limited to women.12PubMed Central. Consecutive Bilateral Iliac Stress Fracture in an Adult Male Runner
Standard X-rays are not very sensitive for catching early stress fractures in the iliac bone. MRI is the preferred tool because it can pick up bone marrow edema, the early swelling inside the bone, before a visible crack appears on plain films.12PubMed Central. Consecutive Bilateral Iliac Stress Fracture in an Adult Male Runner If you are a runner with persistent iliac crest pain that worsens with impact and does not improve with rest over a couple of weeks, an MRI is worth requesting.
Inflammatory and Rheumatological Causes
Pain at the iliac crest that is not tied to a specific injury or activity can sometimes be a signal of a systemic inflammatory condition. In psoriatic arthritis, the iliac crest is actually the single most common site of enthesitis, inflammation where tendons and ligaments meet bone. In a large Chinese registry of psoriatic arthritis patients, roughly 25% to 29% had enthesitis at the iliac crest, more than at any other measured location.13PubMed Central. Enthesitis in patients with psoriatic arthritis: A nationwide data from the Chinese Registry of Psoriatic Arthritis (CREPAR)
Axial spondyloarthritis, the family of inflammatory conditions that includes ankylosing spondylitis, also frequently involves the pelvic entheses. One study found that radiographic entheseal lesions in the pelvic region were present in 76% of patients with radiographic axial spondyloarthritis compared to 58% of matched controls, and lesions in the patient group were more often bilateral.14PubMed Central. Radiographic entheseal lesions of the pelvic region are more prevalent in radiographic axSpA than in age- and sex-matched controls and are associated with more severe spinal disease These conditions tend to produce pain that is worse in the morning and improves with movement, the opposite pattern of most mechanical injuries. If you notice that your iliac crest pain is accompanied by prolonged morning stiffness, especially if it affects both sides, a rheumatological workup is reasonable.
Post-Surgical Donor Site Pain
If you have had spinal fusion or another orthopedic procedure that required a bone graft, there is a specific and well-documented reason your iliac crest might hurt. Surgeons commonly harvest bone from the iliac crest to use as graft material, and the donor site can become a source of chronic pain even when the primary surgery was a success.15PubMed Central. Successful Treatment of Chronic Donor Site Pain
A prospective study of patients who had bone harvested from the iliac crest for anterior lumbar fusion confirmed that persistent donor site pain remains a significant postoperative problem.16PubMed. Iliac crest bone graft donor site pain after anterior lumbar interbody fusion: a prospective patient satisfaction outcome assessment An earlier study looking at posterior iliac crest harvests found chronic pain rates of roughly 28% to 31%, regardless of whether the graft was taken through the primary midline incision or through a separate lateral incision.17PubMed. Chronic donor site pain complicating bone graft harvesting from the posterior iliac crest for spinal fusion If you have had any surgery that might have involved bone grafting, check your operative report. Many patients do not realize their iliac crest was used as a harvest site.
Leg Length Difference and Biomechanical Stress
A difference in leg length, even a modest one, changes how forces distribute across the pelvis during walking and running. The iliac crest height difference is actually used as a clinical estimate of leg-length inequality.18PubMed Central. Pain and Physical Performance Among Recreational Runners Who Receive a Correction for an Iliac Crest Height Difference: A Case Series When one side sits higher, the muscles and ligaments on that side may be chronically shortened while the opposite side is chronically lengthened, creating asymmetric loading patterns that can produce pain at the crest over time. Runners seem particularly susceptible to this because the repetitive impact magnifies small imbalances over thousands of strides. A heel lift or orthotic correction can sometimes resolve the issue, though the evidence is stronger for symptom relief than for any specific correction threshold.
When MRI Findings Do Not Match the Pain
If you have had imaging done for iliac crest pain, there is an important caveat to keep in mind. The fascia lata, the thick band of connective tissue that continues down the thigh as the iliotibial band, attaches at the iliac crest, and MRI studies have found that low-to-moderate abnormalities at this attachment site are commonly seen in people who have no symptoms at all.19PubMed Central. Fascia lata attachment at the iliac crest on MRI That means an MRI finding of “iliac crest enthesopathy” or “fascia lata signal change” does not necessarily explain your pain. Imaging results at this site need to be matched carefully against your specific symptoms and physical exam findings before anyone concludes they have found the culprit. Treating an incidental MRI finding while the real pain generator, perhaps an entrapped nerve or an irritated ligament, goes unaddressed is one of the more common pitfalls in managing iliac crest pain.
Why the Iliac Crest Is Vulnerable in the First Place
The iliac crest bears the mechanical consequences of a design tradeoff that happened millions of years ago. When early human ancestors transitioned to walking upright, the ilium became shorter from top to bottom and wider from front to back compared to the tall, narrow ilium of apes.20Nature. The evolution of hominin bipedalism in two steps That reshaping was critical for bipedal locomotion because it repositioned the gluteal muscles to act as hip stabilizers rather than extensors. But it also created a broad, flat bony surface where many different muscle and fascial structures compete for attachment space. The result is an anatomical intersection where the demands of core stability, hip function, and trunk rotation all converge on a relatively thin shelf of bone. Every step you take loads this intersection, and every trunk twist stresses it further. That is why so many different problems, from nerve entrapment to ligament strain to growth-plate injuries, all localize to the same strip of bone along the top of the hip.