IBAN: IT36M0708677020000000008016 - BIC/SWIFT:
ICRAITRRU60 - VALERIO DI STEFANO or
EXAMINATION 27
TESTING RANGE OF MOTION OF JOINTS
AND STRENGTH OF MUSCLES
Children who have disabilities that affect how they move often have some muscles that
are weak or ‘paralyzed’. As a result, they often do not move parts of their bodies as much
as is normal.
Loss of strength and active movement may in time lead to a stiffening of joints or
shortening of muscles (contractures, see Chapter 8). As a result, the affected part can no
longer be moved through its complete, normal range of motion.
ACTIVE MOVEMENT
Normally the shoulder
muscles can raise the arm
until it is straight up.
When the shoulder
muscles are paralyzed,
the child can no longer
actively lift his arm.
shoulder
muscles
used to
raise arm
shoulder
muscles
small and
weak
Lifting the arm like this
with the arm’s own muscles
is called ACTIVE MOTION.
PASSIVE MOVEMENT
At first the paralyzed
arm can be lifted
straight up with help.
This is called PASSIVE
MOTION.
Unless the normal range
of motion is kept through
daily exercises, the passive
range of motion will steadily
become less and less.
tight
cords
and
skin
Now the arm cannot be
raised straight up, even
with help.
In the physical examination of a child with any weakness or paralysis of muscles, or joint
pain, or scarring from injuries or burns, it is a good idea to test and record both RANGE OF
MOTION and MUSCLE STRENGTH of all parts of the body that might have contractures
or be affected. There are 2 reasons for this:
• Knowing which parts of the body have contractures or are weak, and how much,
can help us to understand why a child moves or limps as she does. This helps us
to decide what activities, exercises, braces, or other measures may be useful.
• Keeping accurate records of changes in muscle strength and range of motion
can help tell us if certain problems are getting better or worse. Regular testing
therefore helps us evaluate how well exercises, braces, casts, or other measures
are working, and whether the child’s condition is improving, and how quickly.
For testing range of motion and muscle strength, it helps to first know what is normal.
You can practice testing non-disabled, active persons. They should be of the same ages
as the disabled children you will test. Age matters because babies are usually weaker and
have much more flexible joints than older children. For example:
A baby’s back and
hips bend so much
he can lie across
his straight legs.
A young child bends
less but can usually
touch his toes with
his legs straight.
Around 11 to 14 it is
harder to touch toes.
His legs grow faster and
become longer than his
upper body.
Later, upper body growth
catches up with legs.
He can again touch toes
more easily.
disabled village children
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