Motor Disorders in Children
Linda Mullin Elkins
This chapter is designed to assist the doctor of chiropractic in the care and chiropractic management of a child with motor disorders. Prior chapters of this textbook have discussed the evaluation and chiropractic management of the neurotypical child. This section will discuss the relevant adaptations to clinical history, physical examination, chiropractic evaluation, and chiropractic management of the child with a motor disorder. Because discussing all possible individual disorders would be outside the scope of this textbook, two conditions will be used to highlight those modifications. We will outline the two most common disorders: hypertonicity and hypotonicity. The clinician can use the information in this chapter to extrapolate similar clinical modifications for the care of children with various motor conditions.
HISTORY
Obtaining a clinical history of a child with a disability can be its own challenge because there may previously have been extensive medical intervention. For a complete view into this child’s history, the doctor must allow adequate time for a thorough interview with the parents or caretaker and the child (if possible). Questions should be asked that will allow the chiropractor to get a complete understanding of what the child can do, what they cannot do, and what they may be able to do. Obtain all medical records when possible, but be careful not to be biased by them. It is important to ask your own questions and take your own measures.
A thorough pediatric history should include prenatal, perinatal, and postnatal development. This includes questioning the mother about the length of the pregnancy, complications, infections, and drug intake. Understanding the perinatal period should include questions about the type of delivery, duration of labor, medications, anesthesia, use of assisted devices (forceps, vacuum), and fetal presentation. The history should also contain postnatal information such as birth weight, gestational age, Apgar scores, and complications after birth. In a child with a disability, it is important to expand questioning to include all hospitalizations, childhood illnesses, surgeries, traumas, medications, allergies, and nutritional status. Many children who later show delayed development and disabilities often display feeding problems early in life, including reflux, excessive colic, and formula changes. Sleeping habits can also be altered in many children who later display developmental disabilities, so a thorough history must include deliberate questions about these areas (1). Further questions about the child’s growth and developmental progress, including gross and fine motor milestones, social behavior, speech and language development, school performance, and hearing and vision outcomes should be included. The doctor can gain a vast amount of knowledge about the child by having the child, parent, or caretaker give a description of a “typical day” for the child. Include questions about temperament, eating patterns, discipline problems, and interactive skills. The demands on a family with a disabled child are great, so a detailed social history should be taken. Ascertain who the primary care giver is and what the challenges are in the home both physically and socially for this child and the family. Because many physical disabilities are permanent, it also is important to define the family’s expectations of the chiropractic care.
EXAMINATION
As with any patient, cooperation is essential in obtaining accurate findings. The order of the examination can be flexible. Knowing what to expect in the broad clinical picture can alleviate much of the apprehension about working with these special children. Keep in mind that
this child most likely has been examined by individuals of multiple disciplines. A fearful child must be put at ease before any examination can begin. Take care to direct as much verbal interaction as possible to the child, even if they do not seem to understand. Never underestimate how much language a child can comprehend. Some nonverbal children use computer-assisted communication devices but they may not have the vocabulary to be specific when relaying their problems. Having pain charts with faces that range from smiles to frowns or a childfriendly picture available that allows the child to point to specific anatomy can facilitate communication and assist in future assessments. Although you may want to focus on their disability, begin by looking at the whole child and note their general appearance, nutritional status, ability to move, alertness, interest in their surroundings, playfulness, distress, and vocalizations. All of these impressions are judgments used to recognize the progress or deterioration of the child’s condition and should be very carefully and specifically documented. The physical examination of a child is already challenging, but it can be overwhelming in a patient who is nonverbal and nonambulatory with athetoid body movements. Some conditions may require the clinician to perform an examination that is normally done on a thin, slippery exam table to modify the procedures to be done in a seated position, lying across a lap, or with an air mattress on the floor. Doing a thorough and reproducible examination is important to document the effects of chiropractic intervention. After a thorough history, take the time to organize your thoughts and plan the exam. In some cases, this can mean a subsequent office visit.
this child most likely has been examined by individuals of multiple disciplines. A fearful child must be put at ease before any examination can begin. Take care to direct as much verbal interaction as possible to the child, even if they do not seem to understand. Never underestimate how much language a child can comprehend. Some nonverbal children use computer-assisted communication devices but they may not have the vocabulary to be specific when relaying their problems. Having pain charts with faces that range from smiles to frowns or a childfriendly picture available that allows the child to point to specific anatomy can facilitate communication and assist in future assessments. Although you may want to focus on their disability, begin by looking at the whole child and note their general appearance, nutritional status, ability to move, alertness, interest in their surroundings, playfulness, distress, and vocalizations. All of these impressions are judgments used to recognize the progress or deterioration of the child’s condition and should be very carefully and specifically documented. The physical examination of a child is already challenging, but it can be overwhelming in a patient who is nonverbal and nonambulatory with athetoid body movements. Some conditions may require the clinician to perform an examination that is normally done on a thin, slippery exam table to modify the procedures to be done in a seated position, lying across a lap, or with an air mattress on the floor. Doing a thorough and reproducible examination is important to document the effects of chiropractic intervention. After a thorough history, take the time to organize your thoughts and plan the exam. In some cases, this can mean a subsequent office visit.
Assessment of Movement
Observation of the young child held in the parent’s arms can reveal important information about their movement and posture.
Does the parent have to support the head and trunk, or can the infant be held by the pelvis and support their own body against gravity?
Is the baby’s head and trunk rotated or collapsed to one side?
Is the baby able to hold their arms forward to grasp a toy at midline?
Are the arms and scapula retracted or adducted against the trunk?
Are the lower extremities adducted tightly or are they floppy?
Are the ankles held in plantar flexion or dorsiflexion and are the toes loose or tightly curled?
If the child uses a wheelchair, notice if they are independently propelling the chair or are they being helped?
Is the wheelchair providing postural support or is their body able to support itself freely?
What does the posture look like, is the child in a pelvic position of anterior or posterior tilt and does their posture seem symmetric?
After observing the gross motor assessment, an examination should extend into individual motor functions appropriate for the child’s age and level of function. Observe the child in different positions, including prone, supine, side-lying, kneeling, on all fours, standing, and walking. If the child possesses a higher level of motor skills, the evaluation should extend to climbing stairs, standing on one leg, running, jumping, and skipping. In a child who uses a wheelchair, observe how they function while shifting weight, navigating ramps and curbs, propelling the wheelchair, and transferring themselves from the wheelchair (2).
Assessment of Tone
The newborn shows a wide variety of autonomic reactions that can be used to examine the functional integrity of the nervous system. These reactions, known as infant reflexes, wane or disappear at predictable times representing nervous system maturity. The neurologic examination of an infant includes the evaluation of infant reflexes as well as the child’s active and passive tone and posture. Because tone is influenced by the tonic neck reflex, it is important that the neck of the infant is straight and they are awake but not crying during all tonal evaluations.
Active tone describes how a muscle or group of muscles feels during movement. Range, rhythm, symmetry, and smoothness of motion, as well as the posture between these movements, are recorded as part of the tonal exam (3). Because the child younger than the age of 5 typically is unable or unwilling to understand instructions enough to evaluate active tone against resistance, this evaluation is restricted to palpation and visualization during spontaneous play. Passive tone describes how a muscle or a group of muscles feels when the joints of the body are submissively moved through a particular range. If resistance is felt, the term stiffness is used to describe the feel during the movement of the limb. During passive motion of a limb, a neurotypical child should demonstrate some resistance to the motion but no stiffness or irregularity of motion. In a child with abnormally high tone that is caused by spasticity, extreme resistance and stiffness may be felt and an alternation in smoothness of motion may occur. This resistance is typically dependent on the velocity of the limb movement. The quicker the motion, the more resistance is felt. An excessive increase in muscle tone and a reduced ability of a muscle to stretch is called
hypertonia. In contrast, a lack of active tone or limited resistance to passive motion is an indication of hypotonia. These findings are not mutually exclusive and can coexist. Infants with cerebral motor lesions may show no resistance to passive motion until after a brisk stretch, and then hypertonia is seen. A child with a constant hypotonic feature may have abnormal passive tone in the limbs and normal active tone in the posture muscles. Changes in tone and reactions to stretch are especially important processes to understand when doing a chiropractic evaluation or adjustment. Motion palpation of the spine and extremities can stimulate reflexes and alter tone; low-amplitude, high-velocity thrust adjustments, which involve quick muscle stretch, may need modifications.
hypertonia. In contrast, a lack of active tone or limited resistance to passive motion is an indication of hypotonia. These findings are not mutually exclusive and can coexist. Infants with cerebral motor lesions may show no resistance to passive motion until after a brisk stretch, and then hypertonia is seen. A child with a constant hypotonic feature may have abnormal passive tone in the limbs and normal active tone in the posture muscles. Changes in tone and reactions to stretch are especially important processes to understand when doing a chiropractic evaluation or adjustment. Motion palpation of the spine and extremities can stimulate reflexes and alter tone; low-amplitude, high-velocity thrust adjustments, which involve quick muscle stretch, may need modifications.
Maneuvers that measure flexibility can also uncover tonic changes in an infant. The scarf test is done with the infant in a semi-recumbent position. Both arms are folded across the chest, pulling the hands toward the opposite shoulder. A normal test shows the elbows unable to cross midline, while a child with hypotonia shows unrestricted movement of the elbows across midline. To measure tone in the lower extremity the fall away response can be performed. While inverting the infant by their feet, let go of one foot. The infant should maintain the extended position of the leg for a moment before it drops. In a child with hypotonia, the leg drops immediately. Infants with hypotonia are subject to hip dislocation. Take care to evaluate the integrity of the joints before performing this maneuver.
Active tone can be measured with a test called the arm traction response. With an infant lying supine, engage the palmar grasp reflex with your index finger and support the infant’s forearms with the rest of your fingers. Gently pull the child up to a 45-degree sitting position and watch the reaction of the trunk and extremities. Do not pull the child up by their forearms; he or she must hold on using their palmar grasp reflex. In normal development, an infant younger than 6 weeks of age displays an inability to hold the head up as it lags behind the body but the legs should actively abduct. From 6 weeks to 6 months, the head should align with the trunk and the elbows and the knees and ankles should begin to fold toward the torso. A hypotonic infant will continue to display a lagging of the head after 6 weeks of age. In a child with hypertonia it is possible to see the extensors actively holding the head back, in which case you may also observe extension and lateral flexion when the infant is in a prone position. As the infant matures to 8 to 9 months of age, an active impulse to raise themselves up as you lift is observed in the neurotypical child during the arm traction response test Figure 26-1.
MOTOR DISORDERS
In the following section, two physical disabilities of childhood will be used to highlight the differences in chiropractic analysis and care for conditions that are present with hypertonia or hypotonia. It would be beyond the scope of this textbook to discuss all possible physical conditions and how they might alter chiropractic analysis and management. Though it is important to understand the exact presentation of each child’s physical
disability, many conditions that alter tone require similar modification to chiropractic analysis and management.
disability, many conditions that alter tone require similar modification to chiropractic analysis and management.
Hypertonia/Cerebral Palsy
Spastic hypertonicity is seen with widespread brain injury to the motor cortex. When the injury occurs in children younger than the age of 2, it is classified as cerebral palsy (CP). If the injury occurs after 2 years of age it is classified as a traumatic brain injury. CP is part of the upper motor neuron syndrome and manifests with spasticity, clonus, hyperreflexia, and persistent primitive reflexes.
CP is not a singular syndrome, but rather a diverse group of nonprogressive motor and postural syndromes that can display a wide range of severity. The etiology of CP is also multifactorial, and causes can be congenital, genetic, inflammatory, infectious, anoxic, traumatic, and metabolic. The injury to the developing brain may be prenatal, perinatal, or postnatal. Although CP is a static encephalopathy, the appearance of the clinical features may change over time as the brain matures (4). The prevalence of CP worldwide has been steady over the last 30 years at a rate of 2 per 1,000 births. Children with moderate and low birth weight (less than 3.3 pounds) account for approximately 50% of all cases of CP (5).
Clinical Signs and Symptoms Frequently the child with CP will have a sensory processing dysfunction in one of three sites:
the cerebral cortex and pyramidal tracts that result in spasticity
the cortical-basal ganglia-thalamic loop, resulting in athetosis; or
the cerebellum, which results in ataxia
There can also be a mixed type of CP. These are classified most often as spasticity and athetosis and, less often, as ataxia and athetosis (6).
Spastic CP syndromes are most common, representing approximately 70% to 75% of the cases (4). The spastic form of cerebral palsy can be further broken down into the physical body regions that are affected by the cerebral lesion. Spastic quadriplegia has a 10% to 15% occurrence and is the most severely disabling form of CP involving all four limbs and the trunk. The upper limbs are more severely involved than the lower limbs. These children generally have severe cognitive impairments and are nonambulatory because they display few voluntary movements. Spastic diplegia is the most common form of CP and accounts for 30% to 40% of all cases. It is characterized by stiff, awkward movements of the lower extremities that are more severely affected than the upper limbs; muscular hypertonicity; increased deep tendon reflexes; “scissor gait”; and toe-walking of the lower extremities. In severe cases, there is flexion of the hips, knees, and, to a lesser extent, elbows. In the spasticity of CP the muscles do not work in tandem, agonist contracting and antagonist relaxing; instead, they all fire together. The recognizable “scissor gait” is a result of the hip adductors and flexors overpowering the smaller abductors and extenders. Children with spastic hemiplegia (20% to 30% incidence) are affected on one side of their body, and their upper extremity is more affected than their lower extremity. Spastic monoplegia involves only one limb and is very rare (7).