peds Flashcards
botox mechanism
inhibition of presynaptic release of acetylcholine at the neuromuscular junction
mechanism of baclofen
GABA agonist, binds to GABA receptors in the spinal cord to block excitatory neurotransmitter release
best predictor for walking in CP
ability to sit independently by 2
inheritance of Duchenne’s
x-linked recessive, absent dystrophin
indications for scoliosis surgery in Duchenne’s
posterior fusion if >20-30 degrees, before FVC < 35%
inheritance of spinal muscular atrophy
autosomal recessive mutation in survival motor neuron 1 (SMN 1)
what determines SMA disease severity?
number of SMN 2 genes and amount of SMN protein produced
CMT type 1 inheritance
autosomal dominant duplication of PMP 22 on chromosome 17
what foot muscles are weak in CMT?
peroneus brevis and tib ant
what foot muscles are strong in CMT?
peroneus longus, posterior tib
acceptable alignment for proximal humerus fracture >12 yo
<50% displacement, <40 degrees angulation
xray view to best see lateral condyle fracture
internal rotation oblique
what metaphyseal diaphyseal angle indicates risk of progression in Blount’s?
> 16
inheritance of tibial hemimelia
autosomal dominant
spine reasons to keep kids out of contact sports
“DOCK EM” downs syndrome, os odontoideum, congenital stenoais, klippel feil, effacement of CSF on MRI, myelomalacia
inheritance of Scheuermann’s kyphosis
autosomal dominant
what is the blood volume in kids?
75ml/kg
systemic and local inflammatory response in kids compared to adults
dampened systemic, robust local
femoral head blood supply before 4 years
medial and lateral circumflex
femoral head blood supply after 4 years
mostly medial femoral circumflex
what vessel is at risk with piriformis entry nail?
deep branch of medial femoral circumflex
order of closure of distal tibial physis
central -> posterior -> medial -> lateral
what is tillaux fracture
avulsion of AITFL
position of talus and calc on clubfoot xrays
parallel on both AP and lateral
treatment for dynamic supination in 3-5 yo w/ ho clubfoot
anterior tibialis tendon transfer to lateral cuneiform
which coalition has the anteater sign on xray?
calcaneonavicular
which coalition has the c-sign on xray?
talocalcaneal
muscle imbalance in CMT cavus foot
weak tib ant, peroneus brevis, and intrinsics. strong peroneus longus (long is strong)
how do you address claw toes in CMT?
EHL transfer to 1st MT or IP fusion
soft tissue procedure for flexible cavus foot
plantar release, longus to brevis transfer
what spine pathology is common in achondroplasia?
decreasing interpediculate distance from L1-L5, foramen magnum stenosis, thoracolumbar kyphosis
spine pathology a/w pseudoachondroplasia
C1-2/atlantoaxial instability
inheritance of diastrophic dysplasia
autosomal recessive mutation in DTDST gene
condition a/w cauliflower ears, hitchhikers thumbs, short stature (rhizomelic), and cleft palate
diastrophic dysplasia
mutations in multiple epiphyseal dysplasia
COMP, type IX collagen (COL9A2 and 9A3)
what condition should you think of if you see bilateral perthes?
multiple epiphyseal dysplasia
Morquio syndrome inheritance
autosomal recessive deficiency in galactosamine-6-sulfatase or beta galactosidase (cause keratin sulfate accumulation)
what condition is a/w increased risk of malignant hyperthermia?
OI
inheritance of Marfan’s syndrome
autosomal dominant mutation in fibrillin-1 (FBN1) which causes increase in TGF-b levels
treatment for hypophosphatemic (X-linked dominant) vitamin D resistant rickets
phosphate and vitamin D
inheritance of hypophosphatasia
autosomal recessive
labs in hypophosphatasia
low alk phos, high urinary phosphoethanolamine
inheritance of Larsen syndrome
autosomal dominant FLNB mutation
how does Larsen syndrome present?
multiple joint dislocations (hip, knee, shoulder, radial head - reduce knees before hips), cardiac defects, cervical kyphosis
hunter syndrome inheritance
x-linked recessive mutation in iduronate-2-sulfatase enzyme
what other tests should you get in radial clubhand?
CBC (fanconi’s anemia), renal US, echo
which type of polydactyly is more common in african americans?
postaxial. if caucasian, get workup
what is the main factor that dictates treatment for hypoplastic thumb?
stability of CMC joint
treatment for hypoplastic thumb with unstable CMC joint
index finger pollicization
what is alpha angle on DDH US and what is normal?
bony acetabulum, normal > 60
what is beta angle on DDH US and what is normal?
femoral head cartilaginous coverage, normal < 55
primary blood supply to proximal femoral physis before age 4
posterosuperior branch to lateral cervical ascending artery (comes from medial femoral circumflex)
inheritance of Aperts
AD mutation in FGFR2
blocks to reduction in DDH
TAL, pulvinar, hypertrophied labrum, inferior capsule, psoas tendon
gene a/w PFFD
sonic hedgehog
kocher criteria
WBC > 12k, ESR > 40, inability to bear weight, T > 101.5/38.6
factors predictive of septic arthritis in order of senstivity
fever > CRP > ESR > refusal to bear weight > WBC
incidence of septic arthritis with 3/4 Kocher criteria
93%
most common sequela of posteromedial tibial bowing
3-4 cm LLD
gene a/w fibular hemimelia
sonic hedgehog
most frequent location of OCD
posterolateral portion of medial femoral condyle
which risser stage is peak height velocity
0
most common deformity in congenital scoliosis
unilateral bar
most likely to progress deformity in congenital scoliosis
unilateral bar with contralateral hemivertebra
most common bacteria for osteo following varicella
group A beta-hemolytic strep