The Galeazzi sign is a bedside test used to detect hip dislocation in infants and young children, most commonly as part of screening for developmental dysplasia of the hip (DDH). It was originally developed to identify gross hip deformity in pediatric patients and remains one of several physical examination maneuvers performed during well-child visits.1PubMed Central. Mathematical modeling of the so-called Allis test: a field study in orthopedic confusion Despite its simplicity, the sign has some striking limitations in sensitivity that make it a better confirmatory finding than a screening tool on its own, and its relationship to the broader DDH examination is worth understanding in detail.
How the Test Is Performed
The Galeazzi sign is one of the easier orthopedic tests to describe. The infant is placed on their back on a flat surface with both hips and knees flexed so the feet rest flat. The examiner then looks across the tops of the knees from the foot of the table. If one knee sits visibly lower than the other, the test is positive on the side with the shorter-appearing thigh. That apparent leg-length difference suggests the femoral head on the lower side has slipped out of its normal position in the hip socket, effectively shortening the thigh segment. The test relies on the observation of displacement in a resting posture, making it straightforward enough that a parent could, in theory, notice the asymmetry during a diaper change, though clinical training sharpens the eye considerably.2PubMed Central. Developmental dysplasia of the hip in infants younger than six months: Ultrasonographic assessment in relation with risk factors
A few practical details matter for accuracy. The pelvis needs to be level, meaning the baby should not be squirming or tilted. Both feet should be side by side and the heels as close to the buttocks as is comfortable. If the baby is fussy and arching their back or lifting one leg, the comparison becomes unreliable. Examiners typically perform the test several times to confirm the finding, and they look for asymmetry in thigh skin folds at the same time, since extra creases on one side can accompany a dislocated hip.
What the Sign Is Looking For
Developmental dysplasia of the hip is a spectrum. At its mildest, the hip socket is slightly shallow but the femoral head stays in place. At its most severe, the femoral head is fully dislocated and sitting outside the socket. The Galeazzi sign specifically targets that severe end of the spectrum: a hip that is already out of joint, producing a real difference in how high each knee reaches. It does not detect a merely shallow socket or a hip that can be provoked into sliding in and out. This is an important distinction, because a large proportion of DDH cases are milder than full dislocation, and the Galeazzi sign will miss them entirely.
The sign is also unilateral by nature. If both hips happen to be dislocated symmetrically, the knees will still appear roughly equal in height, and the test will look normal. Bilateral DDH is less common than one-sided involvement, but it does occur, and a normal Galeazzi sign cannot rule it out.
Diagnostic Accuracy
The numbers on the Galeazzi sign are humbling. In a study of infants under six months screened for DDH, the test returned a sensitivity of only about 8.5 percent. That means it missed more than nine out of every ten cases. On the other hand, its specificity and positive predictive value were both 100 percent: when the sign was present, the hip was truly dislocated every single time.3Advanced Medical Journal. The validity of clinical examination in screening of developmental dysplasia of the hip among infants aged less than six months The negative predictive value was only about 43 percent, reinforcing that a normal-looking Galeazzi test does not mean the hip is fine.
In practical terms, this makes the Galeazzi sign a nearly perfect “rule-in” test but a terrible “rule-out” test. If you see it, act on it. If you don’t see it, you still cannot relax about DDH. This profile is actually useful in a busy clinical setting, because a positive Galeazzi sign gives the examiner near-certainty that something is wrong and warrants imaging. The problem is that relying on it alone would let most affected babies slip through undetected.
Why Sensitivity Is So Low
Several factors conspire to keep the Galeazzi sign’s sensitivity poor. First, as noted above, the sign depends on a real difference in thigh length, which only happens with a fully dislocated hip. Hips that are subluxable (can be pushed partially out) or merely dysplastic (shallow socket, head still seated) will not produce the knee-height discrepancy the test looks for. Because the DDH spectrum tilts heavily toward milder forms, the majority of cases produce no visible sign.
Second, very young infants have short, chubby thighs with a lot of soft tissue padding. A small difference in bony position can be obscured by fat and skin folds, especially if the baby is large for gestational age. Third, the test requires the baby to hold still in a symmetric position long enough for the examiner to compare both sides. Any squirming introduces error. These are not fixable limitations of examiner skill; they are built into the anatomy and behavior of the patient population.
Fourth, bilateral dislocation is invisible to the test by definition. Although bilateral cases account for a minority of DDH, they represent some of the most severe presentations, so missing them is not trivial.
How the Galeazzi Sign Fits Into the Broader DDH Examination
Clinicians never rely on the Galeazzi sign alone. The standard physical examination for DDH in newborns and young infants typically involves the Ortolani and Barlow maneuvers. The Ortolani test gently abducts the flexed hip while lifting the femoral head forward; a palpable “clunk” as the head slides back into the socket indicates a dislocated hip that can be reduced. The Barlow test does the reverse, applying gentle posterior pressure to see whether a hip in the socket can be provoked into dislocating. Together, these two maneuvers are the core of the newborn hip exam and are most useful in the first few weeks of life, before the soft tissues around the hip tighten up.
The Galeazzi sign becomes more relevant as the baby ages. The Ortolani and Barlow maneuvers lose reliability after about two to three months because increasing muscle tone and ligament stiffness make it harder to feel the clunk. In an older infant whose hip has been dislocated for a while and is no longer easily reducible, the Galeazzi sign and restricted hip abduction become the main clinical clues. A baby who cannot open one hip as widely as the other during a diaper change, combined with a positive Galeazzi sign, raises strong suspicion of a fixed dislocation that may need more aggressive treatment.
Even with all clinical tests combined, physical examination alone has limited accuracy for DDH screening. A study assessing child health nurses found that physical assessment achieved about 50 percent sensitivity, 75 percent specificity, and roughly 71 percent accuracy when compared against ultrasound as the reference standard.4PubMed Central. Screening Accuracy for Developmental Dysplasia of the Hip by Child Health Nurses Those numbers are better than the Galeazzi sign alone but still leave a lot of room for missed diagnoses, which is why imaging plays such a central role.
The Role of Ultrasound and X-ray
Hip ultrasound is the gold standard for DDH diagnosis in infants younger than about four to six months. It can visualize the cartilaginous structures of the hip socket that do not show up on X-ray at that age, because the femoral head and much of the acetabulum have not yet ossified. Ultrasound can grade the severity of dysplasia, show whether the hip is seated, subluxed, or dislocated, and guide treatment decisions. Countries differ on whether ultrasound should be performed universally on all newborns or selectively on babies with risk factors or abnormal physical exams.
After about six months, the femoral head begins to ossify, and plain X-rays become useful. A pelvic radiograph in an older infant can show whether the femoral head is sitting in the socket and whether the acetabulum is developing normally. Several radiographic measurements help quantify how shallow or steep the socket is and whether the hip is tracking toward normal development or worsening.
The Galeazzi sign itself can be correlated with imaging. When ultrasound confirms a dislocated hip, clinicians may note whether the Galeazzi sign was also positive on exam, and in practice a positive Galeazzi sign in a baby with known risk factors almost always triggers an ultrasound referral promptly.5PubMed Central. Developmental dysplasia of the hip in infants younger than six months: Ultrasonographic assessment in relation with risk factors The point of the clinical exam is not to replace imaging but to decide who needs imaging and how urgently.
Risk Factors That Should Lower Your Threshold
Certain babies are at higher risk for DDH, and clinicians are trained to be more suspicious in these cases, even when the physical exam looks normal. The most consistently identified risk factors include breech presentation (especially frank breech, where the baby’s legs are folded up against the torso), female sex, and a first-degree family history of DDH. Firstborn children and babies born from pregnancies with reduced amniotic fluid also carry elevated risk.
For parents, the practical takeaway is that a negative Galeazzi sign in a baby with one or more risk factors should not be taken as reassurance that the hips are fine. Many guidelines recommend imaging for high-risk babies regardless of the clinical exam. If your baby was breech, if there is a family history of hip problems in infancy, or if the pediatrician notices any asymmetry in hip motion or thigh folds, ultrasound is a quick and painless way to get a definitive answer.
What Happens When the Sign Is Positive
A positive Galeazzi sign typically triggers a referral to pediatric orthopedics and imaging confirmation. The treatment that follows depends on the baby’s age and the severity of the dislocation. In young infants, the first-line treatment is usually a Pavlik harness, a soft brace that holds the hips in a flexed and abducted position (like a frog-leg stance) to encourage the femoral head to settle into the socket. The harness is worn full-time for several weeks, and the hip is monitored with serial ultrasounds to ensure it is reducing properly.
If the Pavlik harness fails or the baby is older than about six months when the dislocation is discovered, a closed reduction under anesthesia may be needed. The surgeon manipulates the hip back into the socket without an incision and then applies a spica cast to hold it in place. In the most delayed or severe cases, open surgery to clear soft-tissue obstacles from the socket and reposition the femoral head is required. The general rule is that earlier detection leads to simpler, less invasive treatment with better outcomes. This is exactly why screening matters so much, and why the Galeazzi sign’s low sensitivity is such a real-world concern: missed cases get diagnosed later, when treatment is harder.
Naming Confusion With the Allis Test
If you search medical textbooks, you will find some calling this the Galeazzi sign, others calling it the Galeazzi test, and still others calling it the Allis test or the Allis sign. This is not a matter of two different tests; it is one test with two eponyms, and the naming has caused documented confusion in orthopedic education. Riccardo Galeazzi, the Italian surgeon, and Oscar Allis, the American surgeon, both described the same clinical observation. Different training traditions adopted different names.6PubMed Central. Mathematical modeling of the so-called Allis test: a field study in orthopedic confusion
The confusion gets worse because Galeazzi’s name is also attached to a completely unrelated injury: the Galeazzi fracture, which is a fracture of the radius bone in the forearm combined with dislocation of the joint at the wrist end of the forearm. This has nothing to do with hips or infants; it is an adult or older-child forearm injury treated surgically. The only thing the Galeazzi sign and the Galeazzi fracture share is the name of the same surgeon. If you encounter “Galeazzi” in a medical context, pay attention to whether the discussion is about a hip or a forearm, because the two entities could not be more different.
When the Sign Shows Up Outside Infancy
Although the Galeazzi sign is most commonly discussed in the context of infant DDH screening, the same principle applies whenever one thigh is effectively shorter than the other with the patient supine and knees bent. In older children, a positive Galeazzi sign could indicate a missed or late-presenting hip dislocation, a consequence of conditions like cerebral palsy (where muscle spasticity can pull the hip out of joint over time), or a leg-length discrepancy from another cause entirely, such as a growth plate injury or a congenital limb-length difference.
In adults, a version of the test is occasionally used in chiropractic and osteopathic practice to assess functional leg-length inequality, though the clinical meaning in adults is debated and the anatomical causes are very different from those in infants. Adult leg-length discrepancy can stem from prior fractures, joint replacements, scoliosis, or pelvic obliquity, none of which share the same urgency or treatment pathway as infant DDH.
Asymmetric Skin Folds and Other Soft Signs
Parents sometimes notice that one thigh has more skin creases than the other, or that one buttock fold sits higher, and wonder whether this means a hip problem. Asymmetric thigh or gluteal folds are considered a “soft sign” of DDH. They are nonspecific: plenty of babies with perfectly normal hips have uneven creases simply because of how their fat is distributed. But when asymmetric folds appear alongside a positive Galeazzi sign or restricted abduction on one side, the combination strengthens the clinical suspicion and makes imaging referral more likely.
On the other hand, symmetric skin folds can coexist with bilateral hip problems, so symmetry does not equal normality any more than a level Galeazzi sign does. The overarching lesson is that no single physical finding in the DDH exam is reliable enough on its own to diagnose or exclude the condition. The exam is a package, and imaging is the tiebreaker.
Late-Diagnosed DDH and Why Screening Gaps Matter
One of the more frustrating scenarios in pediatric orthopedics is DDH that is not caught until a child starts walking. These children often present with a limp, a waddling gait, or one leg that appears shorter when standing. By that point, the hip socket has been developing without the femoral head properly seated in it, sometimes for a year or more, and the acetabulum may be too shallow to hold the head even after it is reduced. Treatment at this stage frequently requires surgery, prolonged casting, and sometimes multiple operations over several years. Outcomes are worse than with early detection and bracing.
This is the clinical context that gives the Galeazzi sign its importance despite its poor sensitivity. Even a test that catches only a small fraction of cases is valuable when the cost of missing those cases is high. Every baby whose positive Galeazzi sign leads to an early ultrasound and a Pavlik harness is a baby who might otherwise have ended up in an operating room at age two. The sign’s perfect specificity means it never sends a family on a false alarm, and its role as a late-phase confirmatory finding fills a gap that the Ortolani and Barlow maneuvers cannot cover once the baby is past the newborn period.