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Developmental Dysplasia of the Hip | 마이메르시 MyMerci
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Developmental Dysplasia of the Hip

NCLEX Review Guide: Developmental Dysplasia of the Hip (DDH)

Definition and Pathophysiology

Understanding DDH

  • Developmental Dysplasia of the Hip (DDH) is a condition where the hip joint doesn't form properly, ranging from mild dysplasia to complete dislocation of the femoral head from the acetabulum.
  • The condition occurs due to abnormal development of the acetabulum (hip socket) that fails to adequately cover the femoral head, leading to instability.
  • DDH affects approximately 1-3 per 1000 live births and is more common in females (6:1 ratio) due to maternal hormone sensitivity.

Key Points

  • DDH exists on a spectrum from mild hip instability to complete dislocation
  • Early detection and treatment are crucial for optimal outcomes
  • The condition may be present at birth or develop during the first year of life

Risk Factors and Assessment

High-Risk Factors

  • Female gender - 6 times more likely due to increased sensitivity to maternal relaxin hormone
  • Breech presentation - especially frank breech with extended hips and flexed knees
  • Family history - genetic predisposition increases risk by 6-fold
  • Firstborn children - due to tight uterine muscles and decreased amniotic fluid
  • Oligohydramnios - decreased amniotic fluid restricts fetal movement

Memory Aid: "FIRST BABY"

  • Female gender
  • In utero positioning (breech)
  • Relaxin hormone sensitivity
  • Sibling order (firstborn)
  • Tight uterine space
  • Breech presentation
  • Amniocentesis complications
  • Birth weight >8 lbs
  • Younger maternal age

Clinical Assessment and Diagnostic Tests

Physical Examination Findings

  • Ortolani test - detects hip dislocation by attempting to reduce a dislocated hip; positive when a "clunk" is felt as the femoral head relocates into the acetabulum
  • Barlow test - identifies hip instability by attempting to dislocate the hip; positive when the hip can be pushed out of the socket
  • Asymmetric gluteal folds - unequal skin creases on the posterior thigh and buttocks
  • Limited hip abduction - inability to abduct the affected hip to 90 degrees when knees are flexed
  • Apparent leg length discrepancy - affected leg appears shorter when knees are flexed (Galeazzi sign)
Important Alert: Ortolani and Barlow tests should only be performed by experienced healthcare providers as excessive manipulation can worsen the condition

Ortolani vs. Barlow Test Comparison

Test Purpose Technique Positive Result
Ortolani Detect dislocation Abduct hips while lifting femur "Clunk" as hip reduces
Barlow Identify instability Adduct hips while pushing femur posteriorly Hip dislocates out of socket

Treatment and Nursing Management

Age-Specific Treatment Approaches

  • Newborn to 6 months - Pavlik harness maintains hips in flexion and abduction, worn 23 hours daily for 6-12 weeks
  • 6 months to 2 years - Closed reduction under anesthesia followed by spica cast application for 3-6 months
  • Over 2 years - Open surgical reduction with possible osteotomy, followed by spica cast immobilization

    Pavlik Harness Care Instructions

  1. Check skin integrity under straps twice daily for redness or breakdown
  2. Keep harness on 23 hours per day, removing only for bathing as ordered
  3. Place T-shirt or onesie under harness to protect skin
  4. Ensure proper fit - should allow for 2-finger width under straps
  5. Monitor for signs of femoral nerve palsy (foot drop, numbness)
  6. Teach parents proper diaper changing techniques with harness in place

Clinical Scenario

A 3-month-old infant is being treated with a Pavlik harness for DDH. The mother reports red marks under the chest strap. What is the priority nursing action?

Answer: Assess skin integrity immediately and notify the provider. Red marks may indicate improper fit or excessive pressure, which can lead to skin breakdown. The harness may need adjustment or temporary removal to prevent complications.

Commonly Confused Points

DDH vs. Other Hip Conditions

Condition Age of Onset Key Features Treatment
DDH Birth to 1 year Hip instability, positive Ortolani/Barlow Pavlik harness, casting, surgery
Legg-Calvé-Perthes 4-8 years Avascular necrosis of femoral head Activity restriction, bracing
SCFE 10-16 years Slipped capital femoral epiphysis Surgical pinning

Memory Aid: Age Groups

  • DDH = "Diapers" (infants)
  • Perthes = "Preschool/Primary school" (4-8 years)
  • SCFE = "Secondary school" (adolescents)

Study Tips and Quick Checks

NCLEX Success Strategies

  • Remember that early detection is key - all newborns should be screened for DDH
  • Focus on family education regarding proper harness care and compliance
  • Understand that treatment success depends on age at diagnosis - earlier is better
Common Pitfall: Don't confuse the direction of hip positioning - DDH requires FLEXION and ABDUCTION, not extension

Quick Check Boxes

Can you differentiate between Ortolani and Barlow tests?
Do you know the age-appropriate treatments for DDH?
Can you identify risk factors for DDH development?
Do you understand proper Pavlik harness care?
Can you recognize complications of untreated DDH?

Remember: You're preparing to protect and care for the most vulnerable patients. Your knowledge of DDH can prevent lifelong disability in children. Stay focused, trust your preparation, and approach each question systematically. You've got this!

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