Paediatric
Development
Podiatrists
often confronted with paediatric patients whose problems a variation
in the usual landmarks of development --
importance of understanding of normal development process.
Phases
of growth:
Early
embryo 0-2 weeks
Embryo
2-8 weeks
Foetus
8 weeks-birth
Infant
Birth-2 years
Normal
prenatal development of the lower limb:
| Week |
Changes |
| 1 |
After fertilisation, zygote rapidly divides to become a morula,
then become a blastocyst (implants in posterior aspect
of uterine wall) |
| 2 |
Aminiotic cavity forms |
| 3 |
Organs begin to develop; neural plate closes to form neural
tube |
| 4 |
Limb buds appear |
| 5 |
Foot plates appear; nerves to extremities develop |
| 6 |
Limb perpendicular to torso |
| 7 |
Lower limbs commence medial rotation towards 90°; feet
in equinus and inversion; hallux 50° adducted; digital rays
begin to appear with interdigital clefts; muscles appear; ossification
points of femur and tibia appear |
| 8 |
Distinction between thigh, leg and foot; ossification points
of fibular appear; all basic organ development is complete |
| 9 |
Osseous nuclei of metatarsals and phalanges appear; digits
well developed; foot completely inverted |
| 10 |
Dorsiflexion of foot begins |
| 12 |
Arms and legs move independently of trunk; nails begin to
form |
| 16 |
Eversion of feet due to valgus torsion of talus and calcaneus
commences |
| 22 |
Toe nails lie in the dorsal position |
| 32-34 |
Anterior transverse crease on sole of foot |
| 36-38 |
Occasional creased on the anterior two thirds of foot |
| 39-40 |
Sole covered with creases |
Relationship of prenatal development to foot pathology:
* Arrest of development
* Clubfoot
* Metatarsus adductus
* Joined toes
Please
revise and study your first year biomechanics notes on the evoluation
of human gait
Relationship
of evolutionary development and foot pathology:
Many of the changes that
the foot is assumed to have gone through during phylogenetic development
can be seen in the developing ontogenetic development.
Recapitulation:
'During embryological development, an organism passes through stages
which resemble the structural form
of several ancestral types of the species as it evolved' (Haekel's
Law)
* evident in the early stages of development of the human embryo
and foetus
*
possible explanation for the existence of structural anomalies in
the lower limb
Tax
(1982) suggests that our technological environment has evolved more
rapidly that the structure and function of the foot. The hard unyielding
surfaces that we walk on put the contoured foot at a functional
disadvantage as it is not designed for use on a hard flat surface
-- the foot has to pronate excessively to reach the ground.
Post
natal development
1
month:
Spontaneous motor activity generalised; holds head up slightly when
prone and can rotate head to either side; poor supine head control;
beginning to notice surroundings; follow objects to midline; rounded
back (flexed) when sitting; holds hands tightly clasped; reciprocal
kicking when supine
2
months:
Motor activity generalised; smiles and coos socially; follows objects
past midline; raises head and chest when prone – can hold
position.
3
months:
Follows well with eyes; may wave at toy; beginning to regard hands
– can hold hands in front of face; Good control of head when
prone and looking around – can follow an object; Head control
improved when in sitting position; Moro’s reflex disappearing;
Smiles – coos in a more sustained fashion; kicking when supine
4
months:
Beginning to reach for toys symmetrically; Regards toys and may
pull them to mouth; removes cloth from face; control of head good
when sitting – looks around; plays with hands; laughs; rolls
from prone to supine
6
months:
Reaches with either hand and begins to transfer objects; elevates
trunk with elbow extension; rolls over; may sit briefly when placed
in sitting position; laughs and plays with examiner; rolls from
supine to prone and back; can bring feet to mouth
8
months:
Sits alone and unsupported – can raise self to sitting; beginning
to creep reciprocally; vocalises with infantile rhythms and polysyllabic
vowel sounds; regards self in mirror
10
months:
Crawls reciprocally; pulls up on rail; may begin to cruise with
external support; uses thumb and index finger in opposition; may
say ‘mama’ or ‘dada’; feeds self biscuits
and holds own bottle.
12
months:
Walks with support; stands alone; places cube in cup; tries to build
tower of two cubes; may have two words in addition to ‘mama’
or ‘dada’; begins to feed self with fingers
15
months:
Walks alone; creeps upstairs; 4 to 5 word vocabulary; pats picture;
drinks from a cup; beginning to feed self with a spoon; makes wants
known by pointing or vocalising
18
months:
Walks well; sits on a chair; throws a ball; climbs on furniture;
stacks 3 – 4 cubes; 10 word vocabulary; begins to identify
pictures; pulls toys on string; may be toilet trained during day
2
years:
Runs well; negotiates steps one at a time; jump off low step; uses
pronouns and 3 word sentences; feeds self with a spoon; refers to
self by name; toilet trained during day; can kick ball forward and
throw ball overhand
2.5
years:
Can jump of step with one foot landing; can mount a tricycle; undresses
self partially; attempts to put on socks; draws horizontal or vertical
lines but does not cross them; refers to self as ‘I’;
knows full name; helps to put things away
3
years:
Alternates feet going up stairs; jumps off step with two feet landing;
pedals tricycle; builds tower of cubes; names drawings; uses plurals
and obeys propositional commands; feeds self well; buttons clothes
and puts on shoes
4
years:
Runs and climbs well; walks downstairs alternating feet; hops on
one foot; throws a ball overhead; attempts to catch a ball or kick
it in the air; pedals tricycle rapidly; draws a man with head, trunk
and arms or legs; counts 3 objects; names one or more colours
5
years:
Skips, alternating feet; draws man; copies a square, cross, and
a circle; dresses and undresses without assistance; knows the name
of 4 or more colours; counts to 10 or higher
6
years:
Draws a man with hands and clothes;
repeats 4 digits; knows morning and afternoon; knows left from right
Gait Milestones
10
– 11 months:
Jerky hip and knee motions; centre of gravity moves out of the base;
increased time of knee extension
12
months:
Accelerates body by circumducting the legs
15
months:
Wide base of support; lacks arm swing (flexed arms); external femoral
position, knees face externally; catches up with their centre of
gravity; limited control over velocity; abducted, flat foot; full
foot strike.
2
years:
Arms by side although lack co-ordination; flat foot, fails to supinate;
hips still externally rotated
3
years:
Internal hip position; decreased base of gait; increased arm co-ordination
reciprocal arm swing; tibial valgum; some foot slap although resupination
occurs
5
– 6 years:
Heel to toe gait with active propulsion; knees in frontal plane
Online
resources:
ePodiatry's
resources on paediatric
development
Check
these resources from the Centers for Disease Control:
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