MCCQE 1 Preparation
Paediatric Orthopaedics
Dr. Ken Kontio
Outline
Exam content mainly Common / bread n`butter topics Meat and potatoes
Questions?
Case
7 month old presenting with leg concern
Mother noticed left leg shorter to finger assisted standing
Exam shows Ortilani/Barlow tests neg, mildly decreased Abduction left hip, mild LLD with left shorter than right What do you think is going on?
Options
Xrays legs to find site of shortening U/S hips to diagnosis possible DDH
(dislocation) Xray hips to confirm dislocation hip Give shoe lift for better posturing Pavlik harness for obvious hip dislocation
clinically
DDH
Commonest paediatric hip problem early on Presentation may be very benign
Decreased abduction most sensitive after 3-6mo
Exam : Ortolani + for dislocated hip
Barlow + for dislocatable hip
Workup U/S early (<3mo) Ossification femoral epiphysis 3-6 mo Xray later due to void defect from ossification
DDH
Treatment Dislocated - reduction, confirmation, pavlik Dislocatable - immediate post birth, repeat later
- later, pavlikPavlik continues until normal U/S or Xray (AI<22º)
Late may need CR (spika) older than 6 mo Later may need surgery, older than 1 year
(painless limp-todler or less) Long term follow for normal acetabular
development (surgery if no AI in 18mo)
DDH
Case
6 year old boy with pain in the Rt knee Limps at end of day, no complaints of pain
Exam shows mild limp, Knee exam normal
What to Do?
Options
Give tensor for sore knee Xray knee to rule out fracture Examine hips for source of problem MRI knee to rule out meniscal pathology Tap knee for possible infection
Perthes
Hip concern in child 4-8 years Commonly knee pain as presenting complaint
If leg pain always think about hip pathology Presentation
Painless limp Decreased ROM (esp. Abd, IR)
Perthes
Perthes
X-Ray Unilateral or mixed stage bilateral Epiphyseal ossification abnormalities
Tx Maintain ROM Coverage issues Self limiting Head sphericity key to long term outcome
SCFE
Most common cause of hip problems in adolescents
Some able (stable) and some not able (unstable) to walk
Obligatory ER hip with flexion If not teen consider outliers (endocrine
disorders, renal disease)
Xray needed to make diagnosis
SCFE
Workup Xrays show slipped
neck-head interface
Tx All need protection All need treatment Pin(s) across slip Closure about 6-12
months Watch for avn
Scoliosis
Congenital types need progress documented to prove progressive nature Rule our renal (U/S) or cardiac
(Echo) involvement
Infantile AIS, more boys, left convex thoracic curves Many resolve on their own
Scoliosis
Juvinile and adolescent curves Right thoracic and left lumbar
curve directions Risk of progression 1º maturity
related
Presentation Painless, if painful consider spinal
pathology
Scoliosis
Treatment 0-25(30) observe 25(30)-45(50) brace 50 or more consider
surgery
Brace used until maturity Surgery to correct and prevent
progression
Cases
A 6 year old child is brought to your office for assessment of a “longer” leg on one side.
Exam shows that this child has about 1 cm difference, the right longer than the left
Parents wonder if they should be concerned?
What would be the expected discrepancy at maturity?A. 1cm
B. 1.5 cm
C. 2.5 cm
D. 5cm
E. 10cm
LLD - How would you mange this child?A. Tell them that we need to do an operation
immediately to shorten the right legB. Tell them that it will stay that way and not be
an issueC. The child will need a lengthening procedure
later in life when done growingD. Tell them that it will increase but will be
acceptableE. Tell them to get a shoe lift when patient
complains of pain with walking.
LLD
Common presentation Main issue is LLD at maturity Most proportional
If 10% less at a certain age, will be same percentage at later age (ie. 10% shorter in 15 cm femur is 1.5 cm, but same child at maturity with 40 cm femur it’s a 4 cm LLD)
Causes include: hemihypertrophy, fibular hemimelia
Half deformity present at 3yrs (girls), 4yrs (boys)
LLD
Some are dynamic Growth arrest after trauma Will change quickly with time Growth femur
20% proximal 80% distal (9-10 mm/year)
Growth tibia 40% distal 60% proxiaml (6 mm/yeal)
Example: 10yr old boy (16yrs mature) with distal femur arrest will get (6 yrs growth x 10 mm/yr = 6 cm LLD)
LLD - Treatment
General rules: Discrepancy at
maturity main concern
Length and angulation (both planes) clinically relevant
If growing consider using growth arrest
If done growing consider lengthening or shortenting
0-2 cm nothing 2-5 cm lift 5-7 cm shortening or
lenghtening or epiphysiodesis
7-15 lengthening >15cm amputation
and / or prosthetics
Cases
4 year old boy presents with pain in his hip and a low grade fever.
Limp started two days earlier Progressive difficulty walking Temperature 37.6 (oral), ROM hip irritable Xray hip normal, WBC mildly increased, ESR
up about 35 (0-20)
What is your plan of management?
Options
1. U/S hip, aspiration/ arthrotomy , start antibiotics
2. Give him NSAID and follow up in 1 week
3. Start Abx and admit for observation
4. Start Abx and admit for hip arthrotomy / washout
5. U/S of hip and start antibiotics
6. Admit for bone scan and start antibiotics
Infection vs Inflammation
Often asked to differentiate between joint involvement (bacterial vs “viral”)
Spectrum of findings Walking painless limp to bedridden, painful Workup best to rule out options
Sensitive but not specific Labs, xrays, physical exam
Radiology U/S of joints, Bone scans of bones
Inflammatory
Presents as benign picture Little systemic evidence of infection Recent illness common (URTI)
Tx Watch for worsening Workup to rule out other problems Arrange close follow-up
Infective
Active picture clinically Workup suggestive but not localizing If joint fluid, obligated to sample If no fluid, bone scan to rule out osteo
Antibiotic therapy only after samples and treatment (if surgery) carried out
Deep infection needs deep treatment
Osteomyelitis
If near joint can mimic septic arthritis (Especially acetabular osteomyelitis)
Pain, fever, minor guarding if at all of joints Blood cultures, radiographs, then IV Tx
before getting bone scan
Weird things such as salmonella common in sickle cell disease, but Staph Aureus still most common in this population
Fractures
Salter –Harris classification II most common III-IV intra-articular
requiring anatomic reduction
V diagnosed after arrest seen
Fractures
If displaced and healing Accept up to 20-30 degrees angulation in
plane of joint in young child (<10yrs) Healing time same, remodelling time about 1
degree /month
If SH injury (I-II) After 7-10 days do not manipulate for risk of
iatrogenic injury to growth plate
General Principles A/B/C
Hx timing, mechanism, weight-bearing, last meal, allergies
PE deformity, bleeding, open wounds, bruising, distal
pulse, neurological motor and sensory (2-pt discrimination) exam
immobilization the unstable fracture needs immobilization before
imaging (any fracture really)
analgesia oral/sc/IV
General Principles
Investigation plain film:
2 views 90 degrees apart including joints above and below
oblique or additional views for certain body parts: cervical vertebrae, hand, ankle, foot, phalanges
Bone scan more sensitive in certain settings e.g scaphoid
fractures CT
helps define complex fractures e.g. intra-articular fratures, c-spine fractures (NOT instability)
MRI’s role continues to expand delineates surrounding tissue injuries e.g. spinal
cord compression
General Principles Orthopedic Consultation
general indications
open, unacceptably displaced, neurovascular compromise, significant joint or growth plate involvement
specific indications
non-avulsion pelvic fractures, femur fractures, dislocation of major joints (not shoulder),
spinal fractures
Special Considerations
Open fracture Td, IV Abx, never suture (tightly) overlying skin, ortho
consult
Compartment Syndrome need not be a significant fracture (or no fracture) pain with passive extension is the earliest sign
Pathologic Fracture tumors e.g. osteosarcoma hereditary diseases e.g. osteogenesis imperfecta metabolic diseases e.g. rickets neuromuscular diseases e.g. Muscular Dystrophy infectious diseases e.g. osteomyelitis
Case
9 month old brought in for clicking in thigh and pain with movement of right leg Mom noticed this 1 hour ago(diaper change) This morning after baby and twin would not
settle down (crying), dad took this (injured) twin to the other room hoping separation would settle things
Dad states he lay with child on bed and baby settled.
EXAM: obvious instability mid femur, Fractured on xray
Special Considerations Child Abuse
features strongly suggestive of abuse
fractures inconsistent with the history
fractures inconsistent with the child’s developmental age
multiple fractures, specially in various stages of healing
fractures in those less than 1 year-old
mid-diaphyseal periosteal elevation
epiphyseal or diaphyseal rib fractures
spiral fractures in non-ambulating children
epiphyseal-metaphyseal fractures: corner fractures bucket handle fractures
Skeletal survey required in suspected cases
Corner Fractures
2-month-old female
to ER for decreased movement of the left leg
according to the mother, the infant cries a lot when she is dressed
the step-father told her that while he was cleaning the house, he tripped over the infant's brother and accidentally stepped on the baby
Bucket Handle Fracture
9 m.o. is to ER when it was noted something is wrong with the infant's arm after a toy was pulled away from him
infant was in the care of the baby-sitter at that time.
Abuse
Any case you suspect it or think about it as a real possibility, you obligated to contact authorities.
Social worker first line Abuse team at any children’s hospital Police if above not available
Document accurately concerns and discrepancies if any…stories change over time.
Questions?
Remember balance is best!! (Relax and take the time for yourself and family)