August 2018

Understanding the ‘odd gait’ of autism

Children with autism spectrum disorder (ASD) are often described as “uncoordinated” or “clumsy” and many have clear motor control impairments. Early intervention to address motor deficits may improve physical skills and the difficulties with social functioning that are the hallmark of the disorder.

By Keith Loria

Research among children with ASD has traditionally focused on impairments in social skills, the condition’s core deficit. Less attention has been paid to gross motor skills and motor strategy deficits, which also have an impact on social skills and functioning, according to recent research.1-3

Compared with healthy controls, children with ASD have higher rates of motor skill impairments, including deficits in coordination during gross and fine motor activities, balance skills, gait patterns, postural stability, joint flexibility, and movement speed.4-9 Despite the frequency of these issues—two investigations, for example, have reported prevalence rates of poor motor skills in children with ASD of 59%6 and 79%7—motor impairments are not part of the disorder’s diagnostic criteria.

Nicole Rinehart, PhD, professor of psychology and director of the Deakin Child Study Centre at Deakin University, in Burwood, Victoria, Canada, has for the last few decades worked clinically with children with neurodevelopmental disorders.

“Early on in my career I was struck by the unusual gait that my patients with autism and Asperger’s demonstrated, and how this appeared to differentiate these children from children with other neurodevelopmental disorders such as ADHD, so this began my long-standing research interest9 in this field,” she said. “Gait studies10 have informed us that wide, cerebellar-ataxic type gait patterns can be seen in both adults and children with ASD.11 A reduction in step and stride length and increased step width are among the most consistently identified spatiotemporal gait anomalies identified from these studies.”

Atypical development and delays in postural control around the head and trunk have also been consistently reported in the ASD literature, from infancy to adulthood.12 This may manifest as problems with sitting and standing, and a more pronounced postural sway.12 Data from early life through adulthood also show a relationship among ASD severity, motor impairment, and postural instability.7

“Poor postural control and motor skills can make it dif cult to develop visual attention, spatial awareness, and con dence in social settings.” —MeganSmith,CO

It is now understood that motor skills issues in children with ASD are not an isolated problem, Rinehart said, noting they can affect many areas of functioning and impact everyday life. “Primary school-aged children with ASD may experience significant difficulties planning, monitoring, regulating, and controlling movement,” she said.

Because pronounced motor impairments are widespread in individuals with ASD, she added, they should be considered a core symptom and a target for early diagnosis and treatment.

“Motor activity abnormalities may be present prior to two years of age in individuals who are later diagnosed with autism,”13 said Rinehart. “Detecting atypical motor disturbances at a younger age can enable early implementation of effective interventions and consequently improve outcomes. Early intervention is essential to prevent impairments in skill-related fitness from affecting participation in physical activity.”

Social connection

Some experts believe that deficits in motor skills may play a role in some of the challenges with social skills in children with ASD. “With poor postural control and motor skills, it can be difficult to develop visual attention and spatial awareness, as well as confidence in social settings,” explains Megan Smith, CO, director of clinical research and orthotist for Surestep in South Bend, Indiana.

Jamie M. Holloway, PT, DPT, led a study1 earlier this year examining the relationship between gross motor skills and social function in young boys with ASD. She is assistant professor in the School of Physical Therapy and Rehabilitation Sciences at the University of South Florida’s Health Morsani College of Medicine in Tampa, and has served on interdisciplinary evaluation teams in autism diagnostic clinics at the Georgetown University Center for Child and Human Development in Washington, DC, and the University of Alabama at Birmingham Sparks Clinics.

In the study,1 Holloway and her colleagues assessed motor      skills and social function with validated tools in 21 children (all boys) with ASD. They found moderately high correlations between overall gross motor and social skills and between the core stability motor subtest and overall social skills. These findings, as well as previous studies,2 suggest that young boys with ASD and poor motor skills also have low socialization skills.

In another study,14 Holloway found that tasks related to ball skills (throwing, catching, kicking) and stationary skills such as standing on one foot were moderately correlated with overall social skills.

“That study only showed a correlation and we do not know if one causes the other,” she said. “There have also been studies that have reported improvements in social and motor skills following movement-based/motor interventions such as swimming, aquatics, hippotherapy [therapy with horses], or basic movement skills; however, we still need more research exploring this relationship and the potential benefits of interventions.”

Clinical issues

Dalia Zwick, PT, senior rehabilitation supervisor at ST/Premier HealthCare in Brooklyn, New York, noted children with ASD often have issues with toe walking (and running on their tip toes), and that this problem may be persistent, contributing to shortening of the Achilles tendon.15

“Instability in standing and choosing to stand on a single leg from very early age is an interesting phenomenon that is not well researched but is also prevalent when observing individuals on the ASD spectrum,” she said. “Most often it is the same leg but at times it appears like they are searching for some stability and they might stand in an awkward posture [crossing legs and locking their thighs together].”

SMOs with an open-heel modi cation have produced improvements in both gait and perceived coordination in patients with ASD. Photo courtesy of Surestep.

Leg-length discrepancy, which she said is the result of both toe walking and standing on one leg, is another issue Zwick encounters in this population. “The leg that is bearing the weight becomes short and individuals walk with asymmetry in stride length and width as a result. They often pronate severely on the contralateral leg in an attempt to stay balanced. Standing on the short leg is seen in most cases. The longer leg is flexed at the hip and knee and pronates at the foot and ankle,” she said.

The noted “odd gait” of ASD may be the result of leg-length discrepancy and as-yet unexplained sensory issues, she said. “I use the term movement disorder or dystonia to describe this awkward gait,” Zwick said.

A variety of gait analysis strategies have been used in the ASD field, ranging from expert observational studies that typically involve neurological or other motor specialists to retrospective video analysis involving researchers obtaining video footage of infants and toddlers, who were later clinically diagnosed with ASD, to instrumented gait analysis and motion capture technology, which are considered the most reliable and valid assessment techniques.

Holloway noted that motor skills can be evaluated using standardized measures such as the MABC-2 (Movement Assessment Battery for Children, 2nd Edition), the PDMS–2 (Peabody Developmental Motor Scales, 2nd Edition), and the BOT-2 (Bruininks Oseretsky Test of Motor Proficiency, 2nd Edition).16,17

“While none of these tests were designed specifically for children with ASD, they have all been used in research with this population,” she said. “Testing involves observation of the child while they perform a standardized motor task. Some studies have incorporated a picture schedule to help children with ASD transition between testing tasks.”

Treatment

Interventions for gait, Holloway said, depend on the specific impairments observed. They may include orthoses, though some children with ASD may have sensory issues that make wearing devices difficult. “I think an important factor to consider is whether the gait disturbance is interfering with the child’s function and if so, how can we minimize the interference to maximize function,” she said.

Megan Smith has a decade’s worth of experience evaluating and fitting ASD patients with orthoses, as well as analyzing their gait with portable gait analysis systems.

“In regard to orthoses, children with ASD can be treated with designs that provide sensory [proprioceptive] input and help improve lower extremity alignment in order to facilitate better postural control and work on gaining gross motor skills,” she said. “I do not believe they should be given solutions that lock the foot and ankle up in a certain position like subtalar neutral, but rather, be allowed to pronate and supinate within normal limits.”

Moreover, she believes clinicians should also think about allowing a child’s toes to be free.

“With the orthotic design, we should try to mimic typical movement and development and not hinder or block these motions,” Smith said. “Children with ASD and other neuromuscular disorders oftentimes need work on transitional skills, such as transitioning from sitting to crawling, pulling to stand, and standing up from the middle of the floor. Orthoses that block the movement required to do these skills can hinder the progression of gains in gross motor skills and can exacerbate the child’s ‘clumsiness.’”

By providing a better base of support, clinicians can allow a patient to work on lateral weight shifts and postural control, which can help improve strength in the extensors and lateral stabilizers.

Australian podiatrist David Wong often uses a exible, dynamic orthosis that increases proprioception to treat gait abnormalities in children with ASD. Photos courtesy of David Wong, DipPod(NSW), MAPodA.

At Surestep’s clinic, Smith and other clinicians provide supramalleolar orthoses (SMOs) with the open-heel modification and have seen improvements in both gait and perceived coordination in many of their patients with ASD. Smith noted she has also seen improved gait symmetry in children with ASD who have been fit with the devices.

For the issue of toe walking in young children with ASD, Zwick collaborates with the treating physical therapist and uses different types of orthoses, from very rigid (no joint at the ankle region) to more flexible, dynamic devices.

“We also do some innovative intervention, and we raise the heel to give the kid the sensation that they can lower the heel,” she said. “We reduce the heel lift every few months to allow the kid to feel comfortable lowering the heel. This is an approach that is used for kids with CP.”

Debbie Evans, senior pediatric physiotherapist and director of Therapies for Kids, Annandale, Australia, noted children with ASD who walk on their toes due to whatever motor issues they have will experience a number of problems.

“Once they are up, they start to get tightness, they start to have their weight further forward and their center of gravity is not towards the heels, it is coming forward, which makes them fall over and throws off their balance,” she said.

Evans refers children with these issues to David Wong, DipPod(NSW), MAPodA, director of podiatry at Strathfield Podiatry in New South Wales, Australia, who makes sensorimotor orthoses.

“These orthotics provide increased proprioception, and as a flexible orthotic, are dynamic, so we are aiming for correction, plus they make the muscles work in a more correct muscle pattern, therefore still keeping strength of the muscles,” Wong said. “It was designed originally as a cerebral palsy orthotic, however, we are using it very successfully for all types of neurological gait problems, including ASD. We are finding that they can replace a rigid AFO and you can fit them in shoes that fit the patient, not those two sizes bigger, thus giving the patient a less ‘disabled’ look.”

Physical activity and motor skills

Impaired motor skills in kids with ASD can decrease their participation in physical activities and sport and increase their risk of sedentary-related diseases, according to Rinehart. Organized physical activity programs may improve development in children with disabilities, and hold great promise, she said.

Such activities provide an array of opportunities to enhance the motor skills of children with disabilities in a natural setting. Novel interventions have consistently been found to be effective at addressing and improving motor deficits, such as horseback riding, outdoor adventure camp programs, adapted football programs, multisport camps, and kata (a martial art) technique training programs.

Rinehart pointed to clinicians who adapted an Australian Football program for children with ASD.18 The children were taught football skills in groups, and parental involvement was encouraged. The development and delivery of the program involved a multidisciplinary approach, combining the knowledge of both coaches and clinical staff. Children showed a significant improvement in object control skills, but no changes in motor skills.

This adapted program provided an accessible opportunity for families to engage in this cultural and sporting norm, said Rinehart.

“While there are barriers to team sport participation for children with ASD, the program enabled the children to overcome these and experience developmental gains,” she said.

Keith Loria is a freelance writer in northern Virginia.

REFERENCES
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