Moderate Congenital Dysplasias & Skeletal Deformities

Developmental Dysplasia of the Hip (DDH)

Congenital Structural Hip Joint Instability

Primary risk age: Neonates and Infants (Screened from birth through walking age; more common in girls)

Urgency: Moderate
Typical age: Neonates and Infants (Screened from birth through walking age; more common in girls)
Body system: Musculoskeletal System

Typical course: Harness therapy is typically maintained for 6 to 12 weeks; post-surgical casting and remodeling may take 3 to 6 months.

Reviewed against AAP · CDC · WHO · NHS guidance Last reviewed 2026-06-13

1. Summary & Pathophysiology

Congenital Structural Hip Joint Instability

Pathophysiology (Development Path)

Inadequate contact between the femoral head and the acetabulum during early development leads to an underformed, shallow acetabular cup. The femoral head can slide out of the socket, causing subluxation or complete dislocation of the hip joint.

Primary Causes & Etiology

Joint laxity due to maternal estrogen exposure, intrauterine crowding (breech presentation), and post-natal swaddling practices that force the hips into extension.

2. Symptom Continuum

Early Onset Signs
Often painless in infancy. Found during routine screening by detecting asymmetric skin folds on the thighs or buttocks, or a difference in leg length.
Progressive Phase
Positive Barlow (hip dislocates with adduction and gentle posterior pressure) and Ortolani (dislocated hip reduces with abduction and gentle anterior pressure) maneuvers on neonatal exam.
Severe Indicators
Limitation of hip abduction, a waddling gait or limp when the child begins to walk, and a positive Trendelenburg sign (pelvis drops on the unaffected side when standing on the affected leg).

3. Clinical Verification

Hip ultrasound is the diagnostic method of choice for infants under 4-6 months (before the femoral head ossifies). Plain AP hip X-rays are used after 6 months.

4. Care & Elements Plan

Primary Care Treatment Plan

In infants under 6 months, use a Pavlik harness to keep the hips abducted and flexed, allowing the joint to remodel. Older infants or failure of harness therapy requires closed or open surgical reduction and spica casting.

Home Support Elements

Learn to care for an infant in a Pavlik harness or spica cast: keep the skin dry, avoid wetting the cast, and change diapers frequently. Never swaddle the baby's legs tightly together.

Generic Active Ingredients (No Brands)

None. This is a structural and mechanical joint disorder requiring orthopedic device or surgical management.

Lists active elements only. Never administer self-designed therapies.

5. Doctor Critical Lines

Critical Thresholds: When to See a Doctor

Consult a pediatrician if you notice asymmetric leg creases, one leg appearing shorter, or a limp when your child begins to walk.

6. Vaccine & Prevention

Routine Prophylaxis (Prevention)

Avoid tight swaddling of the infant's legs. Use swaddling techniques that allow the baby's hips to remain flexed and abducted ("hip-healthy swaddling").

Immunization Context

No specific immunizations are associated with this congenital joint anomaly.

7. Timelines & Outlook

Active Timeline

Harness therapy is typically maintained for 6 to 12 weeks; post-surgical casting and remodeling may take 3 to 6 months.

Expected Prognosis

Excellent if diagnosed and treated in early infancy, allowing for normal hip development. Late diagnosis increases the risk of early-onset osteoarthritis.

Potential Untreated Complications

Avascular necrosis of the femoral head (from excessive pressure during reduction), residual acetabular dysplasia, limb length discrepancy, and early osteoarthritis.

Moderate

Congenital Talipes Equinovarus (Clubfoot)

Congenital Foot & Ankle Structural Deformity

Neonates (Apparent immediately at birth; more common in boys)

Mild

Pediatric Scoliosis

Adolescent Idiopathic Scoliosis (AIS)

10 to 18 Years (Typically detected during growth spurt)