Clean FRCS notes with inline figures
DDH
Overall treatment principle:
•< 6 months
•Pavlik Harness
•Teratogenic irreducible → CR + arthrogram at 4 months
•6-18 months, or < 6 months fail Pavlik Harness
•Arthrogram + Closed reduction
•Open reduction
•> 18 months
•Open reduction +/- secondary femoral and acetabular procedures
Clinical photographs
•Asymmetrical proximal skin crease
•Limited abduction of left thigh
•Galeazzi test left femur shortening
•r/o DDH
History
•FMHx, 1st born, female, breech, oligohydramnios, twin
Examination
•Asymmetrical thigh crease
•Ortolani (test whether hip is reducible, by elevation and abduction of the flexed femur)
•Barlow (test whether hip is subluxable, by adduction and depression of the flexed femur)
•Abduction ROM symmetrical? (Flexion abduction, most sensitive)
•Galeazzi test (false –ve on bilateral)
•Klisic sign (GT to ASIS, normal if at or above umbilicus)
•Older child: waddling gait with hyperlordosis of lumbar spine
•Ortolani and barlow both specific but not sensitive
Systemically look for associated features (packaging syndrome)
•Torticollis, congenital recurvatum / knee dislocation, calcaneovalgus feet, clubfoot, metatarsus adductus
•Rule out teratogenic dislocation
•Arthrogryposis
•CP / spina bifida
| Type / group | Definition / note |
|---|---|
| Ix | USG (static and dynamic) |
Management:
•Subluxable <2week → can be physiological,double napkin
•Dislocated + reducible or >2 weeks subluxable → Pavlik harness
•No need wait for USG to start PH if dislocatable and reducible clinically
•If dislocated and not reducible: can still try PH X 1 mth
Proposed aetiology:
•Genetic
•Mechanical: breech + knee in extension (strong hamstring act on hip)
•Maternal hormone: ligamental laxity esp in female fetus
•More common over the left side
What’s your view on screening program for DDH?
•Universal screening for DDH using USG has been an area of debate. Overall, found to have low sensitivity (89%) and poor PPV (62%), which leads on over diagnosis and treatment. Does not meet the WHO / Wilson criteria for universal screening.
•Wilson and Jungner criteria 1968
Diagnosis:
•Important health issue. Disease has high enough prevalence to allow screening
Natural history known
•Early sx phase + early treatment > late treatment
Test:
•Accepted by patient
•High sensitivity
•Available facilities
•Cost effective
Screen population features:
Accepted and effective treatment
•Patient are willing to undergo further evaluation and treatment
•2 studies
•2002 JBJS Norwegian group
Universal screening with USG – missed 1 case
Selective screening with USG – missed 5 cases
•No significant difference
•2009 JBJS international hip dysplasia institute
•3 groups
Universal screening
No screening
Selective screening
Selective screening found to be most cost effective
AAP suggest selective screening for:
•Abnormal PE


