Clinical Guides
Developmental Dysplasia of the Hip
A clinically focused guide to developmental dysplasia of the hip, covering serial age-specific examination, selective imaging, referral, treatment, complications and the practical limits of newborn screening in India.
MedNext Academy | 14 min read
Developmental Dysplasia of the Hip
A clinically focused guide to developmental dysplasia of the hip, covering serial age-specific examination, selective imaging, referral, treatment, complications and the practical limits of newborn screening in India.
Summary
Developmental dysplasia of the hip (DDH) describes a spectrum in which the femoral head and acetabulum have an abnormal relationship or development. It ranges from a clinically unstable or dislocated hip to a located hip with residual acetabular dysplasia. The older label congenital dislocation of the hip is incomplete because not every affected hip is dislocated at birth and dysplasia may evolve during infancy. Early detection matters because a concentrically reduced hip has the best opportunity for acetabular development, whereas late presentation may require more complex treatment and can lead to pain or early osteoarthritis.
Screening is a programme of serial clinical surveillance, not one manoeuvre performed once. Newborn examination uses gentle Ortolani and Barlow manoeuvres; after roughly three months, a dislocated hip may become fixed and restricted or asymmetric abduction, limb-length inequality and later gait abnormality become more informative. Breech presentation, a first-degree family history and previous clinical instability increase risk, but many children with DDH have no recognised risk factor.
Ultrasonography is useful before femoral-head ossification when performed and interpreted by experienced staff. Plain pelvic radiography becomes more informative from about four to six months. Imaging must not delay orthopaedic referral for a clearly dislocated or persistently abnormal hip. Treatment is age- and stability-dependent: observation for selected immature stable hips, a supervised abduction harness for appropriate young infants, then reduction, casting or pelvic and femoral surgery for failed or later cases. Avascular necrosis, redislocation, residual dysplasia and stiffness are important treatment harms and follow-up outcomes. This draft remains quarantined following MedNext Clinical Team review.
How Common Is It?
Reported frequency varies because studies use different definitions: a dislocated hip, examination instability and sonographic immaturity are not interchangeable outcomes. The American Academy of Pediatrics clinical report describes clinical instability in about one to two percent of term infants and a much lower frequency of persistent dislocation, while imaging identifies a larger group with immature morphology. Many mild sonographic abnormalities resolve as the hip matures. Quoting the broadest ultrasound percentage as clinically important DDH therefore exaggerates disease and can drive unnecessary treatment.
There is no single contemporary national prevalence that can be applied across India. Birth practices, referral access, training in newborn examination, selective versus universal imaging and the quality of ultrasound interpretation all change apparent rates. Late cases may be more visible in services where the newborn examination or follow-up pathway is inconsistent, but hospital case series cannot be treated as community prevalence. A meaningful local audit separates screen-positive infants, confirmed dislocation, treatment, loss to follow-up and presentation after walking age.
The burden extends beyond incidence. Untreated persistent dislocation changes acetabular development, limb mechanics and gait. Residual dysplasia can cause symptoms only in adolescence or adulthood and is an important precursor of early hip osteoarthritis. Conversely, overdiagnosis exposes infants to repeated imaging, harness treatment, travel and anxiety, and treatment itself can harm the femoral head. A high-quality programme therefore aims neither to label every immature hip nor to promise elimination of all late disease. It combines repeated examination, targeted imaging, reliable referral and outcome surveillance.
Risk Factors
Breech presentation, especially in the third trimester, is the strongest commonly used historical risk factor. Risk relates to intrauterine positioning and is not removed by caesarean delivery or successful version before birth. Female sex and a first-degree family history increase probability, as does a documented episode of clinical instability. First-born status, oligohydramnios, torticollis and foot deformity are associated in observational literature, but their predictive value is weaker or inconsistent; they should support clinical vigilance rather than replace examination.
Mechanical positioning after birth also matters. Tight swaddling with the hips forced into extension and adduction should be avoided. Hip-healthy wrapping allows flexion and abduction and free movement of the legs. This advice should be culturally respectful: demonstrate a safer technique instead of simply prohibiting wrapping used for warmth or comfort. Prematurity complicates age interpretation and imaging timing; corrected age and specialist advice may be relevant. Multiple birth alone is not a sufficient diagnosis, and neither maternal hormone theories nor sex should be used to reassure or alarm a family without findings.
Risk factors guide selective imaging when examination is normal, but absence of risk does not exclude DDH. Most importantly, an abnormal examination carries more weight than a checklist. A positive Ortolani manoeuvre, persistent asymmetric abduction, apparent shortening, parental observation of unequal leg movement or a limp warrants action even without breech or family history. Conversely, isolated asymmetric skin creases have poor specificity. Record exact presentation, gestation, family relationship and examination rather than writing only “high risk”. Such detail lets radiology and paediatric orthopaedics choose the appropriate modality and timing.
Diagnosis
History
Record gestation, presentation throughout the third trimester, delivery, family history of childhood bracing or early hip replacement, previous abnormal examinations and any imaging. Ask whether the infant moves both legs equally and whether caregivers notice difficulty with nappy changes. In an older child ask about delayed walking, limp, waddling, toe walking, apparent limb-length difference or reduced endurance; pain is often absent in early childhood. Clarify swaddling position without blame and identify barriers to follow-up.
Examination
Examine a calm, undressed infant on a firm surface with warm hands. Compare spontaneous movement, apparent femoral length and abduction. Perform Barlow and Ortolani manoeuvres gently and separately for each hip; repeated forceful testing can injure tissue and does not improve detection. A palpable clunk of dislocation or reduction is different from a benign soft-tissue click. By about three months, Ortolani and Barlow sensitivity falls as tissues tighten, so limited asymmetric abduction and Galeazzi apparent shortening become more useful. In a walking child assess gait, pelvic tilt, leg length and lumbar compensation.
Investigations
Do not order imaging merely to postpone referral after a definite abnormal examination. Ultrasound provides dynamic and morphological assessment in early infancy but is operator-dependent and too-early scanning detects physiological immaturity. Selective ultrasound is commonly performed from about six weeks in a high-risk infant with normal examination, or earlier under specialist direction for instability. An anteroposterior pelvic radiograph becomes useful around four to six months as ossification progresses. Interpretation should assess acetabular development and femoral-head position using age-appropriate landmarks; a normal report does not cancel a persistently abnormal examination.
Differential Diagnosis
A benign hip click is an audible or palpable soft-tissue sensation without true femoral-head translation. It is not the same as the distinct clunk of an Ortolani-positive hip, but uncertainty should lead to repeat experienced examination or referral rather than confident dismissal. Physiological sonographic immaturity in the first weeks can resemble dysplasia and often resolves; this is why timing, morphology, stability and age must be interpreted together. Transient newborn packaging positions may also resolve, whereas persistent restricted abduction needs assessment.
Apparent limb asymmetry can arise from congenital femoral deficiency, hemihypotrophy or hemihypertrophy, pelvic obliquity, scoliosis, knee deformity or foot deformity. Neuromuscular disorders can produce hip displacement through abnormal muscle balance, but their surveillance and treatment differ from typical infant DDH. Arthrogryposis and syndromic or teratologic dislocation are usually stiffer and should not be assumed to respond like a reducible typical hip. Proximal femoral focal deficiency and coxa vara have different radiographic anatomy.
In a febrile or distressed infant with painful reduced limb movement, consider septic arthritis or osteomyelitis; DDH is usually painless and does not cause systemic illness. Trauma, non-accidental injury and fracture require an age-appropriate safeguarding assessment. In the limping older child, transient synovitis, septic arthritis, Perthes disease, slipped capital femoral epiphysis, inflammatory disease and malignancy may be more urgent explanations than missed DDH. A Trendelenburg gait or leg-length inequality can suggest late dislocation but is not diagnostic. The differential should reconcile age, pain, fever, range of motion, neurology and imaging rather than anchoring on asymmetric creases.
Management
Management is led by paediatric orthopaedics and depends on age, whether the hip is located, reducibility, imaging morphology and prior treatment. A clinically stable hip with mild ultrasound immaturity may be observed with scheduled examination and imaging because many early abnormalities resolve. Observation is an active plan with a named clinician, interval and endpoint; it is not loss to follow-up. A dislocated or persistently unstable hip requires timely specialist assessment even though bracing need not begin as an emergency before discharge.
For an appropriate young infant, a flexion-abduction device such as a Pavlik harness may maintain reduction while allowing movement. It must be fitted and monitored by an experienced service. Families need practical teaching about skin, straps, nappy care and which adjustments they must not make. Clinical and ultrasound review confirms that the femoral head is reduced; continuing a harness on an unreduced hip can make later reduction harder and may injure the femoral nerve. If stable reduction is not achieved promptly, the plan must change.
Older infants or failed harness cases may need closed reduction under anaesthesia, arthrography, spica casting and sometimes adductor release. Open reduction is used when concentric closed reduction is not achievable. Pelvic or femoral osteotomy may be required for later presentation or residual deformity. Treatment aims for a stable concentric reduction without excessive force. Follow-up continues after apparent success because residual acetabular dysplasia, redislocation and growth-related deformity can emerge. Choice of operation and duration of surveillance are individualized and should not be reduced to a single age table in a general guide.
Prescribing Information
DDH is not corrected by a medicine. Analgesia, anaesthesia, perioperative antimicrobial prophylaxis and cast-related medicines belong to the treating service's verified paediatric protocol. Doses must use the child's current weight, age, allergy history, renal and hepatic status and the planned procedure. A general educational guide should not supply an unsupervised sedative or pain regimen. After reduction or surgery, caregivers need a written medication list that distinguishes scheduled analgesia from rescue medication and identifies the service to contact for uncontrolled pain or adverse effects.
A harness is a medical device, not a harmless garment. Parents should not tighten, loosen or discontinue straps outside the agreed plan. Excessive hip abduction, persistent unreduced positioning and inappropriate sizing can cause harm. Skin should be inspected, but removing the device for bathing or clothing must follow the orthopaedic team's instructions. Double nappies do not treat DDH and should not be presented as a substitute for an abduction orthosis. Forceful stretching or manipulation by untrained providers risks injury.
In a spica cast, safe care includes keeping the cast dry and clean, protecting edges without inserting objects, checking toes for colour, warmth, movement and swelling, and using an approved child-restraint plan. Fever, foul odour, increasing pain, pressure injury, a slipped or cracked cast, cold or blue toes, new weakness, breathing difficulty or inability to pass urine requires prompt advice. Nutritional supplements do not reshape an unstable hip. Prescribing stewardship here means avoiding unnecessary antibiotics and sedatives while ensuring adequate perioperative pain control under a named clinical team.
When to Refer
Refer to paediatric orthopaedics when Ortolani is positive, the hip appears dislocated, instability persists, abduction is limited or asymmetric after the neonatal period, Galeazzi inequality is present, or gait and leg length suggest late DDH. Referral does not require a preliminary scan or radiograph. Send the exact examination, age, corrected age if premature, breech history, family history and previous results. If local access is delayed, speak directly with the receiving service rather than ordering serial low-quality imaging while the child ages.
A clinically stable high-risk infant, including third-trimester breech presentation or a strong first-degree family history, needs a documented selective-imaging and follow-up pathway. Local availability determines whether experienced ultrasound at roughly six weeks or pelvic radiography later in infancy is more reliable. A questionable examination, parental concern or previous instability is also a reasonable threshold for specialist advice. A normal early scan should not end serial examination, because no screening method eliminates late presentation.
Urgent same-day assessment is required when pain, fever, toxicity or refusal to move the limb suggests infection or injury; that is a different emergency from routine DDH referral. A child with neurovascular compromise in a cast or harness, excessive swelling, breathing difficulty or uncontrolled postoperative pain also needs immediate contact. For non-emergency referrals in India, identify an actual paediatric orthopaedic unit, government medical college or credible children's service and confirm imaging expertise, cost, travel and follow-up. A referral that a family cannot reach is not a completed care pathway.
Red Flags
Fever, marked irritability, severe pain, pseudoparalysis or a hot swollen hip is not typical DDH and raises septic arthritis, osteomyelitis, fracture or another acute disorder. Septic arthritis can destroy the joint rapidly; obtain emergency paediatric and orthopaedic assessment and do not wait for a routine dysplasia clinic. Bruising, inconsistent history or injury in a non-mobile infant requires safeguarding consideration. Neurological weakness, loss of bladder or bowel function or a spinal abnormality also changes the pathway.
During harness treatment, loss of kicking, inability to extend the knee, marked swelling, skin breakdown, colour change or a device that no longer fits needs prompt review. Femoral-nerve palsy can present with reduced active knee extension. A harness that does not maintain reduction must not be continued indefinitely. During spica treatment, cold or blue toes, capillary refill change, increasing swelling, severe pain, pressure sores, foul discharge, fever, breathing compromise, vomiting with abdominal distension or a wet, cracked or slipped cast requires urgent advice.
Late diagnostic warning signs include persistent asymmetric abduction, apparent shortening, a painless limp, Trendelenburg lurch, waddling gait or a child who stands with pelvic asymmetry. Bilateral dislocation may hide leg-length inequality and present mainly with lumbar lordosis or waddling. A normal newborn note does not make these findings benign. Likewise, a radiology report of “immaturity” should not be allowed to defer follow-up indefinitely. Red flags include both clinical deterioration and system failure: missed appointments, unavailable skilled ultrasound, contradictory reports or no named clinician responsible for surveillance.
Indian Clinical Context
Indian newborn and child-health care spans home birth, public primary care, district hospitals, medical colleges, charitable services and private practice. The reliability of a single newborn hip check and access to trained infant ultrasonography therefore vary. The practical minimum is documentation of hip examination at birth or first contact and repeated assessment during immunisation and well-child visits. Community and primary teams should know the nearest paediatric orthopaedic referral point rather than treating a screening checklist as the endpoint.
Selective imaging is more defensible than reflex imaging when sonography quality is uncertain. Very early scans can label physiological immaturity; poorly positioned radiographs can also mislead. If breech or family history is present, agree a feasible date and modality with the receiving service and record who will chase non-attendance. Travel, wage loss and repeated appointments can cause attrition. Coordinating imaging and specialist review on the same visit, using telephone reminders and explaining that an asymptomatic baby may still need assessment can improve completion.
Families may use tight swaddling, massage or traditional manipulation. Counselling should respect the goal of warmth and bonding while demonstrating hip-safe flexion and movement and clearly rejecting forceful manipulation. Harness and spica care instructions should be available in the caregiver's preferred language, including transport and car-seat safety. The NMC curriculum still uses the term congenital dislocation of hip within OR12.1; learners should understand why DDH is the broader modern term. National or foreign guidance informs principles, but treatment timing and device monitoring must match local expertise and the individual child.
NMC Competency Mapping
NMC undergraduate orthopaedics competency OR12.1 requires the learner to describe and discuss clinical features, investigations and principles of management of congenital and acquired limb and spinal deformities, explicitly including congenital dislocation of the hip. This guide maps that outcome to the modern DDH spectrum: instability, dislocation and acetabular dysplasia. The learner should explain why the condition is developmental, why early located hips differ from fixed late dislocation and why management complexity increases with age.
Clinical competence includes obtaining breech and family history, performing a respectful infant musculoskeletal examination under supervision, distinguishing an Ortolani clunk from a nonspecific click, and adapting the examination after the manoeuvres lose sensitivity. Learners should know the roles and limitations of ultrasound and radiography, formulate an appropriate referral and counsel caregivers about hip-safe swaddling and follow-up. Reading does not certify Barlow or Ortolani technique; forceful or repeated examination is unsafe and supervised bedside assessment is essential.
For applied discussion, learners should compare observation, harness treatment, closed reduction and surgical reconstruction without pretending that one age alone determines treatment. They should identify avascular necrosis, redislocation, femoral-nerve palsy, cast problems and residual acetabular dysplasia, and explain the need for longitudinal surveillance. Integration spans anatomy of the acetabulum and proximal femur, paediatric growth, radiology, anaesthesia, rehabilitation and communication. A safe examination answer also recognises septic hip and trauma as urgent differentials rather than forcing every reduced limb movement into DDH.
Key Exam Pearls for NEET PG
DDH is a spectrum from acetabular dysplasia to subluxation and dislocation; “congenital dislocation” describes only part of it. Classic risk associations are female sex, third-trimester breech presentation and first-degree family history. Tight swaddling in extension and adduction is avoidable. Absence of a risk factor does not exclude disease, which is why serial examination remains essential. Asymmetric skin folds alone are nonspecific.
Barlow tests whether a located hip is dislocatable; Ortolani detects reduction of a dislocated femoral head. Both must be gentle. Their usefulness falls after about three months as a dislocated hip becomes fixed. Later clues are limited abduction, Galeazzi apparent shortening, limp, Trendelenburg sign and waddling in bilateral disease. Ultrasound is preferred before substantial femoral-head ossification and is often timed from about six weeks for a high-risk but clinically normal infant. Anteroposterior pelvic radiography becomes more informative around four to six months. An abnormal examination is referred without waiting for imaging.
A Pavlik harness maintains flexion and controlled abduction for selected young infants; it requires proof of reduction and close monitoring. Failure to reduce, femoral-nerve palsy and avascular necrosis are key hazards. Later or failed cases may require closed reduction and spica casting, open reduction, pelvic osteotomy or femoral procedures. Remember that treatment is not finished when the hip first looks reduced: residual acetabular dysplasia and redislocation require follow-up. No screening programme catches every late case, and routine treatment of every immature ultrasound is not evidence-based.
Frequently Asked Questions
Does a normal hip examination at birth completely exclude developmental dysplasia?
No. Examination sensitivity changes with age, some dysplasia evolves, and no screening programme eliminates late presentation. The hips should be examined serially during early child-health visits. A later limitation of abduction, limb asymmetry, limp or caregiver concern deserves reassessment even when the newborn record was normal.
Should every breech baby have an ultrasound immediately after birth?
Breech presentation warrants a documented selective-imaging plan even when examination is normal, but very early ultrasound often shows physiological immaturity. Many pathways use experienced ultrasound from about six weeks or a pelvic radiograph later in infancy. Timing should follow a reliable local paediatric orthopaedic and radiology pathway.
Can double nappies or tight wrapping treat an unstable hip?
No. Double nappies do not provide controlled reduction and should not replace an orthopaedic device. Tight wrapping with hips extended and adducted may be harmful. Hip-healthy swaddling permits flexion, abduction and leg movement, while a prescribed harness must be fitted and monitored by an experienced team.
Why is follow-up needed after a harness or reduction appears successful?
A reduced hip can later show residual acetabular dysplasia, redislocation or growth-related deformity. Follow-up examination and age-appropriate imaging check that the femoral head remains located and the socket develops. The duration is individualized; families should not stop surveillance only because symptoms are absent.
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