Pediatrics Test 1: Lecture 1 Flashcards
when/how do skeletal muscles develop in childhood
most skeletal mm fibers present at birth and all are present by 12 months
what cells are important for skeletal mm development and what happens if these cells are impaired somehow
satellite cells
allow mm to build and regenerate
some progressive conditions do not allow these cells to regenerate/restore and thus it is important to know this when treating these pts (i.e. you can’t make the mm grow no matter how much exercise)
important things to note about mm development
mm fibers susceptible to internal and external forces; development and experiences w/i first year can matter
what happens with spastic mm
spastic mm are smaller and more susceptible to contractures
mm do not keep up with growing bone and sarcomeres overstretch
do type I or type II mm fibers atrophy/hypertrophy with various conditions
inconclusive of which fibers are involved in which conditions
with CP type II is lost (fast acting) compared to type I but research is still ongoing
when does bone development progress most rapidly and what does this indicate for premies
more rapid in prenatal period
by birth diaphyses are almost ossified
premature = osteopenia common
what determines if bone growth is complete and when does this happen
epiphyseal plate is ossified, diaphyses and epiphyses are joined, and growth of bone length is considered complete
timing varies with each bone; most are fully ossified by 20 years
after they have ossified PT can no longer change bone structure
when does the skull fully close/fuse
18 months
cant wear helmet after
what determines the joint structure/shape in development
basic structures formed during 6th - 7th week of gestation
final shape develops through early childhood under influence of different forces of movement and compression
forces need to be PROPER to develop normally (i.e. toe walker could be problematic from wrong forces)
what is bone functional adaption
bone shape can be changed after initial development
process uses resorption of old or mature bone and formation of new bone to determine its shape
bone structure adapts in response to mechanical forces that are placed on bone (when therapists can impact bone structure)
how does bone development differ in kids with CP
they do not get as much pressure through the hip via musculature
babies all have shallow acetabulum; is they dont have the right forces then the hip remains shallow/unstable
joint is unstable and not stressed enough to form properly
how might a brachial plexus injury affect bone development
GH joint doesn’t get proper forces w/o mm
why might a premature infant have an extended posture
less movement in womb
more “floppy”/extended posture from lack of mm development
full term baby body/spinal alignment at birth
kyphotic = normal at birth
PPT at birth
if baby is 6 months and still not extending spine or have an anterior pelvic tilt may need to have looked at by a doctor; babies should be pushing up while prone and extending at this point
MSK issues that may occur with adults with CP
scoliosis
hip dislocation
cervical neck dislocation
contracture
arthritis
patella alta (mm not pishing patella into groove and it dislocates)
overuse syndrome
nn entrapment
fx
children with CP typically have what type of impairments
delays with walking
ROM limitations
atypical muscular pull/spasticity
why are hip subluxation/dislocation common with kids with CP
hip is shallow/unstable at birth
kids with CP do not have strong ABD/EXT mm
adduction and flexion mm often override others and pull hip out of joint
this is why it is crucial that kids stand and get compression through the joint
what has happened to the incidence of pathological hip conditions in recent years
increasing
i.e. legg calve perthes and slipped capital femoral epiphysis
examples of rotational/angular problems of the bone
in toeing
blounts disease
patella alta
what is blounts disease
abnormal tibial growth
excessive varus at knees past 2 years old
may need to be referred to orthopedist
treatment = staple growth plate on 1 side to normalize growth
at birth the femur is in more anteversion; what causes this to decrease to more normal ranges
femoral head, neck, and greater trochanteric areas are made of pliable cartilage and attached to rigid osseous diaphysis
as infant develops, normal torsional forces about this point of fixation cause a decrease in anteversion
if important hip motions like ER and ABD are not obtained (i.e. like with walking), proper forces are not present to help develop the hip and decrease anteversion
walking is delayed = infantile torsion does not decrease as it should; with conditions like CP want to intervene early
torsion vs version
torsion = head and neck relative to condyles
version = position of head of femur in acetabulum relative to frontal plane (anteversion- head is more anterior in acetabulum, retro - head is more posterior)
at birth how much anteversion is present at birth and what does this decrease to
40-60 degrees anteversion at birth
resolves to 15-20 deg with proper forces
angle of inclination at birth vs after development
at birth = 150 deg (coxa valga)
2-3 years old = decreases to ~130 deg
what does anteversion of the femur present like
persistent in toeing pattern
common with kids who do not get proper forces
CP - causative factor for hip instability
when does genu varus present a cause for concern
as an infant, physiological bowing is normal
if still present around 2-6 years
varum/torsion generally normalizes by 12-24 months
if there is still excessive bowing of the knees at 1-2 years old, what are some factors that may be contributing
medial knee capsule tightness b/c of interuterine position
coxa valga of femur
lateral hip RT contracture
normal tibia external torsion
about 5 deg as newborn
increases by about 20 deg by adolescence
describe the typical newborn foot
flexible
newborn talocrural joint rests in DP and may have PF limit resulting from intrauterine posture (especially in the last 2-3 months of gestation)
forefoot and rearfoot rest in inversion when non-weightbearing and eversion with supported weight bearing
if not flat/flexible could be a bigger issue
lateral border of the foot should look like what
straight regardless of weight bearing
if curved, could be metatarsal abductus due to intrauterine positioning and may need bracing to correct
typical developing children have flat feet for how long
4-5 years
usually do not treat flat foot unless there is pain, tripping, or no arch
when does longitudinal arch develop
develops over the forst 10 years of life
start seeing development around 4
things to keep in mind with a peds MSK exam
keep a consistent and logical sequence
want a detailed hx (including birth story)
restructure as needed due to child’s participation level
must have a knowledge of peds cases to know what to look for
understand exam procedures appropriate for age and condition
want exam in natural environment if possible
want to keep kid engaged
want to create family centered POC and goals
what to know about observation, ROM, and strength for a general peds assessment
ovservation - observe child playing spontaneously or assist if needed
ROM - assess for limitations, contractures, or excessive motion
strength - can estimate strength from skills a child can perform like riding tricycle, getting up from floor with half kneel, pull to sit, lift head in prone, climbing stairs or others; can use dynamometer at 3 or 4 or MMT
how do kids with JIA often align their legs
ER for greater comfort
may also have leg length discrepancy
kids with CP have an increase likelihood of what type of malalignment as they age
rotational malalignment between tibia and femur
i.e. hip IR and outtoeing
rotational abnormalities are common in kids with what
JIA and CP
especially when ambulatory
force across the knee is dramatically increased
what is a common side effect of disuse in children with severely limited movement such as those with CP, spina bifida, or arthrogryposis
adverse effects such as delaying ossification centers and bone reabsorption
fx risk increases as well
also occurs with other conditions that cause demineralizaton (i.e. on chemo or corticosteroids)
standing programs show improvements in bone density under what parameters
standing between 60-90 min, 5 days a week
standing programs show improvements in hip stability under what parameters
60 min/day when positioned between 30 and 60 deg ABD
effectiveness of weightbearing with adaptive devices
good
impact through bones is best even if only partial WBing
interventions for MSK disorders
strengthening exercises in various conditions
botox
stretching
bracing
supported standing/walking
what type of strengthening has no negative effect of duchens muscular dystrophy
submaximal concentric contraction
avoid eccentric
aquatic exercise is also safe and beneficial
none of these will stop the progession but it can have other benefits
benefits of botox in kids/when it is used/how it works
good for spasticity; works at NMJ and inhbits firing of nn
used when ROM is important for certain activities
research is looking at starting it younger to promote better mm development of kids with mm disorders
recent research also notes that it should not be used in certain joints to increase flexibility
stretching benefits for different types of stretching
short term improvements with normal mm with short term stretches
neuro compromised mm (i.e. CP) need a more prolonged stretch to see improvements
common peds disorders involving bone
fxs
greenstick fx
epiphyseal fx
osteogenesis imperfecta
S&S to screen for abuse
children under 3 that are fx prone
premature kids
developmental disabilities
low socioeconomic status
epiphyseal fxs can cause what types of secondary problems and how prominent are they
can cause problems with bone growth, limb length discrepancy, etc
20% of all fxs in kids
what is osteogenesis imperfecta
genetic collagen problem that causes weak bones
4 types osteogenesis imperfecta
type I = mild
type II = perinatal; lethal; child will not survive
type III = severe/progressive; multiple fxs at birth
type IV = moderately severe
what is duchenne muscular dystrophy
most common muscular dystrophy
fatal/progressive weakness of skeletal and respiratory mm
what causes duchenne muscular dystrophy and what demographics obtain this disease
genetic; recessive defect in X chromosome; males
lack of dystrophin protein production that is needed for mm regeneration
can run in families
life expectancy for DMD
most dont live past 30
kids usually walk until middle school
5 stages of DMD
1 = pre-symptomatic
2 = early ambulation
3 = late ambulation
4 = non-ambulatory
5 = late non-ambulatory
what might you first see with an undiagnosed DMD child
delayed milestones
usually around 3 years; can dx as early as 18 months
clumsy, walk on toes, motor regression, gowers sign
pseudohypertropy in calf = toe walk to stabilize b/c proximal mm are more affected
what happens with kids as DMD progresses
develop scoliosis; can have sx intervention
cardiac/respiratory mm affected (eventually fatal)
some do tendon lengthening to keep feet flat
DMD treatment
corticosteroids to decrease inflammation in mm
genetic treatment being worked on now
PT - QOL is major emphasis; decide goals, PT, aquatics, active ex, standing programs, etc
what is spinal mm atrophy
group of autosomal recessive disorders
mutation or deletion of survival motor neuron 1 (SMN1) gene
characterized by degeneration of anterior horn cells of SC, mm atrophy, absent DTRs, and widespread weakness
sensation/cognition not generally impaired
occurs in 1 of every 10000 live births
4 types of SMA
1 = severe; death by 2 years
2 = moderate; most common; weakness around 7-18 months; progressive
3 = mild; after first 18 months
4 = adult onset
S&S of SMA
hypotonia
absent reflexes
hip sublux
scoliosis
increased club foot
dysphagia
GI dysfunction