Developmental Hip Dysplasia

Lower Limb

Overview

Developmental hip dysplasia (DDH) is a spectrum of hip pathology ranging from acetabular dysplasia to frank dislocation, primarily affecting infants and young children. Early detection and management are critical to prevent long-term complications including osteoarthritis, limb length discrepancy, and gait dysfunction. The condition may present asymptomatically in screening programs or with clinical signs such as limitation of hip abduction, asymmetrical skin folds, and positive Barlow and Ortolani tests.

Pathophysiology

DDH results from inadequate development of the acetabulum and femoral head relationship due to genetic predisposition, intrauterine positioning, ligamentous laxity, and neuromuscular factors. The femoral head may be positioned laterally, superiorly, or completely dislocated from the acetabulum. Failure of normal acetabular ossification and coverage occurs, leading to increased femoral head coverage loss, altered biomechanics, and subsequent cartilage wear. Prolonged malalignment causes adaptive changes in the labrum, capsule, and surrounding musculature, establishing chronic instability and degenerative changes.

Typical Presentation

Site

Hip joint, typically unilateral though bilateral involvement occurs in 10-15% of cases; pain or limitation may be referred to groin, lateral hip, or knee

Quality

In infants: often asymptomatic or presenting with mechanical catching/clunking; in older children/adolescents: aching, stiffness, or intermittent giving way sensation

Intensity

Variable; infants may show no pain; older children experience mild to moderate discomfort with activity

Aggravating

Weight-bearing activities, running, jumping, prolonged standing, hip adduction movements, attempts to bring legs together (in infants, positive Barlow test with adduction and posterior pressure)

Relieving

Rest, hip flexion and external rotation positioning, abduction splinting (in infants), reduced weight-bearing activities

Associated

Asymmetrical hip skin folds, limitation of hip abduction (typically <70 degrees), Trendelenburg gait, toe-walking tendency, apparent leg length discrepancy (shorter on affected side), restricted hip extension, hip external rotation preference, audible clicking with Ortolani maneuver

Orthopaedic Tests

Ortolani Test (Ortolani Maneuver)

Procedure

Patient supine, hip and knee flexed to 90°. Examiner abducts the hip while applying gentle upward pressure to the greater trochanter. A positive finding is a palpable 'clunk' as the femoral head reduces into the acetabulum.

Positive Finding

Palpable clunk or click as the hip reduces, indicating a dislocated hip that can be relocated

Sensitivity / Specificity

60–70% / 95–99%

Ortolani, 1948; endorsed in meta-analyses by Woodacre et al., 2016, BJSM

Interpretation

Highly specific for hip dislocation in infants. A positive result strongly suggests developmental hip dysplasia with an unstable or dislocatable hip. Most sensitive in infants under 8 weeks old.

Barlow Test (Barlow Maneuver)

Procedure

Patient supine, hip and knee flexed to 90°. Examiner adducts the hip while applying gentle posterior pressure to the knee. A positive finding is that the femoral head can be felt to slip out of the acetabulum posteriorly.

Positive Finding

Palpable sliding or clunking of the femoral head out of the socket during adduction and posterior pressure

Sensitivity / Specificity

40–60% / 97–99%

Barlow, 1962; endorsed in meta-analyses by Woodacre et al., 2016, BJSM

Interpretation

Highly specific for hip instability and dysplasia. A positive result indicates the hip can be dislocated, suggesting structural dysplasia. More sensitive than Ortolani in detecting instability before frank dislocation occurs.

Limited Hip Abduction Test

Procedure

Patient supine with hips and knees flexed to 90°. Examiner gently attempts to abduct both hips symmetrically. Measure the degree of abduction bilaterally.

Positive Finding

Asymmetrical hip abduction or abduction limited to <70° on the affected side; normal is typically >75–80°

Sensitivity / Specificity

55–70% / 85–95%

See current literature; widely recommended in paediatric orthopaedic screening protocols

Interpretation

Limited abduction suggests hip dysplasia with possible dislocation or joint capsule tightness. More useful in older infants (3–12 months) as a screening sign when Ortolani and Barlow become negative.

Allis Test (Galeazzi Sign)

Procedure

Patient supine with both hips and knees flexed to 90°. Examiner observes the relative heights of the knees. Asymmetry suggests limb length discrepancy or hip positioning abnormality.

Positive Finding

The knee on the affected side appears lower (shorter limb), indicating possible hip flexion contracture or dislocation

Sensitivity / Specificity

48–68% / 80–92%

Galeazzi, 1910; affirmed in reviews by Woodacre et al., 2016, BJSM

Interpretation

Positive result suggests unilateral hip dislocation or flexion deformity. Less sensitive than Ortolani/Barlow but valuable in infants >12 weeks old when clinical signs become more apparent. Useful adjunct in older infants.

Asymmetrical Skin Folds Test

Procedure

Patient prone or supine. Examiner observes the number, depth, and symmetry of gluteal, inguinal, and thigh skin folds on both sides.

Positive Finding

Asymmetrical, excessive, or deeper skin folds on the affected side; increased number of folds may indicate limb shortening or hip dislocation

Sensitivity / Specificity

50–60% / 60–75%

See current literature; historically cited but now recognized as unreliable as a standalone test

Interpretation

Low specificity; many false positives in normal infants. Should not be used as a primary screening test but may support clinical suspicion in combination with other findings. More useful in identifying relative limb shortening.

Femoral Nerve Stretch Test (Prone Hip Extension Test)

Procedure

Patient prone or side-lying. Examiner flexes the knee and extends the hip, stretching the femoral nerve and hip flexors. Observe for loss of hip extension or groin pain.

Positive Finding

Limitation of hip extension, asymmetrical restriction, or reproduction of groin discomfort

Sensitivity / Specificity

Unknown / Unknown

Interpretation

Sensitivity and specificity not well established in the literature for developmental hip dysplasia specifically. May indicate hip flexor tightness, possible posterior hip dislocation, or hip joint inflammation. Best used as a screening adjunct rather than diagnostic test.

⚠ Red Flags

  • •Bilateral hip dislocation or severe dysplasia presenting after age 18 months without prior intervention
  • •Hip dislocation with neurovascular compromise (pale, pulseless limb, severe pain)
  • •Acute hip pain with fever and constitutional symptoms suggesting septic arthritis
  • •Severe flexion contracture (>30 degrees) indicating avascular necrosis or advanced pathology
  • •Progressive neurological deficit in lower limbs suggesting nerve compression
  • •Signs of child abuse or non-accidental injury with unexplained hip trauma

⚡ Yellow Flags

  • •Parental anxiety regarding developmental milestones and infant movement patterns
  • •Delayed diagnosis leading to parental guilt and adjustment difficulties
  • •Family history of DDH increasing parental health anxiety
  • •Cultural practices involving hip adduction (e.g., tight swaddling) influencing treatment compliance
  • •Socioeconomic factors affecting access to ongoing imaging and specialist follow-up
  • •Uncertainty regarding prognosis and long-term outcomes affecting family coping
  • •Excessive protective behaviors limiting infant's normal movement development

Osteopathic Techniques

Region

Hip joint (acetabular region)

Technique

Soft Tissue

Rationale

Gentle soft tissue mobilization of hip adductors, hip flexors, and piriformis reduces muscle guarding and improves capsular compliance; particularly important in infants to reduce muscular tension contributing to femoral head subluxation

Region

Hip joint in abduction-external rotation

Technique

Functional

Rationale

Positioning the hip in safe range (flexion 90-100 degrees, abduction 45-60 degrees, external rotation 30-40 degrees) and gently oscillating through pain-free range normalizes arthrokinematics and reduces anterior femoral head migration

Region

Lumbar spine and pelvis

Technique

Articulation

Rationale

Mobilizing lumbar segments L4-L5 and sacroiliac joint reduces compensatory hip stress; normalizes pelvic mechanics essential for optimal hip centering and load distribution

Region

Hip capsule and surrounding fascia

Technique

MET (Muscle Energy Technique)

Rationale

Using isometric contractions of hip abductors (gluteus medius/minimus) in neutral or slightly abducted position strengthens dynamic hip stability without provocative adduction; enhances neuromuscular control

Region

Inguinal and pelvic diaphragm

Technique

Lymphatic

Rationale

Gentle lymphatic techniques reduce inflammatory swelling in hip capsule and inguinal region; improves fluid dynamics supporting healing and reducing pain-related guarding during recovery phases

Region

Hip joint with cranial integration

Technique

Cranial

Rationale

Addressing any associated strain patterns through cranial-sacral mechanism and parasympathetic activation reduces overall neuromuscular tension; facilitates dissociation of protective muscle patterns that limit hip abduction

Add-On Approaches

Chinese Medicine

Acupuncture/moxibustion at Huantiao (GB30), Zusanli (ST36), and Liangqiu (ST34) may support qi circulation and reduce inflammation; herbal support with Duhuo Jisheng Tang assists with joint nourishment and pain management

Chiropractic

Specific chiropractic manipulation of L4-L5 and sacroiliac joints addresses any compensatory subluxations; however, direct hip adjustments are contraindicated in active DDH due to joint instability

Physiotherapy

Structured progressive resistance exercises targeting hip abductors and external rotators; balance and proprioceptive training; gait retraining to correct Trendelenburg pattern; functional movement screening for return-to-sport protocols

Remedial Massage

Deep tissue techniques to hip adductors, rectus femoris, and tensor fasciae latae reduce muscular restrictions; soft tissue work to gluteal muscles enhances hip stability; myofascial release of fascial planes surrounding hip reduces chronic compensatory tension

Rehabilitation Exercises

Supine Hip Flexion-Abduction in Safe Zone

Range of MotionBeginner

Supine Figure-4 Hip Stretch (modified for bilateral symmetry)

StretchingBeginner

Prone Hip Flexor Stretch (standing lunge modification)

StretchingBeginner

Side-Lying Hip Abduction with Neutral Spine

StrengtheningBeginner

Supine Glute Bridges (bilateral progressing to unilateral)

StrengtheningIntermediate

Quadruped Hip Extension in Neutral Alignment

StrengtheningIntermediate

Clamshells with External Rotation Emphasis

StrengtheningIntermediate

Standing Hip Alignment and Pelvic Stability Awareness

PosturalBeginner

Single-Leg Stance on Stable Surface (progression to unstable)

BalanceIntermediate

Tandem Walking with Hip Abduction Control

BalanceIntermediate

Stationary Cycling with Adjusted Seat Height (hip in safe zone)

CardiovascularIntermediate

Supine Hip External Rotation Pendulum (child-appropriate modification)

Range of MotionBeginner

Referral Criteria

  • •Age >3 months with positive Barlow/Ortolani tests or imaging confirmation of dysplasia/dislocation—refer to pediatric orthopedic surgeon for management protocol
  • •Persistent hip pain, mechanical catching, or giving way in children >5 years despite conservative management—consider advanced imaging and orthopedic specialist evaluation
  • •Clinical or imaging evidence of femoral head avascular necrosis or early osteoarthritis—refer to orthopedic specialist for surgical considerations
  • •Significant Trendelenburg gait persisting >6 months post-treatment intervention—refer to pediatric physiatrist or gait analysis center
  • •New onset neurological symptoms, progressive loss of hip motion, or signs of nerve compression—urgent referral to pediatric neurology or orthopedic surgery
  • •Failure to progress or worsening hip coverage on serial imaging despite appropriate bracing/treatment—return to orthopedic surgeon for management escalation
  • •Associated developmental delay or neuromuscular disorder affecting hip stability—multidisciplinary referral including pediatric neurology, physiatry, and physical therapy
  • •Red flag presentations including fever, acute severe pain, or signs of systemic infection—immediate referral to emergency department or pediatric infectious disease specialist