Angelman Syndrome Mobility: Will My Child Keep Walking?

Most individuals with Angelman syndrome who learn to walk in childhood will maintain their ability to walk into adulthood, but their mobility requires lifelong support and management ^[1]. While the classic unsteady gait (ataxia) associated with the syndrome is a permanent feature, total loss of walking ability in adulthood is not the natural progression of the disorder itself ^[2][3]. However, adults can lose their functional mobility if secondary physical complications—like severe spinal curvature or joint stiffness—are left unmanaged ^[4]. Maintaining your child’s ability to walk requires a proactive approach focused on protecting their bone and joint health, anticipating their changing needs, and committing to lifelong physical therapy.

The Progression of Ataxia Over a Lifespan

Ataxia refers to the lack of muscle control and coordination that causes the unsteady, wide-based, or “prancing” gait characteristic of Angelman syndrome ^[5].

Research shows that motor challenges and ataxia persist throughout a person’s life ^[1][6]. Studies observing children with Angelman syndrome between the ages of 4 and 11 have noted a tendency for walking patterns to regress into more maladaptive (less efficient) forms, marked by shorter steps and a slower walking speed ^[2]. While human studies are limited, animal models of Angelman syndrome suggest that a gradual decline in motor coordination continues into middle age ^[7][6]. However, it is important to remember that these baseline declines can be largely mitigated with proactive human interventions, such as physical therapy and orthopedic support.

Because their baseline walking style requires more energy and puts uneven stress on the body, individuals with Angelman syndrome are uniquely vulnerable to physical wear and tear as they age. Supportive footwear and Ankle-Foot Orthoses (AFOs) or other orthotics are often used in childhood and can continue to provide crucial stability in adulthood, helping properly align the feet to protect the joints.

Risks to Mobility in Adulthood

The primary threats to an adult’s ability to walk are orthopedic (bone and joint) complications, rather than a sudden neurological decline. If an adult with Angelman syndrome stops walking, it is most often due to pain, structural changes, or a lack of opportunity to move. Because individuals with Angelman syndrome are often non-verbal and may have an atypically high pain tolerance (sometimes even laughing when hurt), they cannot simply tell you they are in pain. Hidden orthopedic pain may present as a sudden refusal to walk, unexplained new behavioral outbursts, or sudden changes in sleep patterns.

• Scoliosis: An abnormal curvature of the spine (scoliosis) is a common orthopedic complication in Angelman syndrome ^[4]. Because individuals with Angelman syndrome may have low muscle tone in their trunk, the spine can progressively curve over time. If unmanaged, severe scoliosis alters the body’s center of gravity, making balance even more difficult and walking painful or impossible. Because scoliosis can progress silently, routine evaluations by an orthopedic specialist—including clinical and radiographic (X-ray) tracking—are essential, especially through the teenage growth years and into early adulthood.
• Joint Contractures: Over time, uneven walking patterns and periods of inactivity can lead to contractures—a permanent tightening of the muscles, tendons, or ligaments around joints, particularly the ankles, knees, and hips. Contractures limit the range of motion necessary for a functional walking gait.
• Bone Health: Weight-bearing activities like walking are essential for building and maintaining strong bones. Children and adults with Angelman syndrome who lose their ability to walk independently are at a significantly higher risk for reduced bone health and fractures ^[8]. For individuals who struggle with independent weight-bearing, standing frames are an excellent alternative to preserve bone density.

Navigating Lifelong Physical Therapy and Mobility Aids

Physical therapy is not just a tool for helping young children take their first steps; it is a critical, lifelong requirement for maintaining mobility in adulthood. Adults with Angelman syndrome must continue to receive developmental services and physical support ^[9].

However, many families face a “services cliff” when their child ages out of the school system at 18 or 21, at which point school-provided therapy vanishes and adult physical therapy becomes difficult to secure. To bridge this gap, parents should work closely with their child’s current physical therapist well before they leave school to develop a comprehensive daily home-exercise program.

The goals of lifelong therapy and movement include:

1. Preserving Range of Motion: Regular stretching and targeted exercises help prevent joint contractures.
2. Core Strengthening: Building trunk stability helps protect the spine and may delay the progression of scoliosis.
3. Gait Training and Balance: Ongoing therapy helps adapt the individual’s walking pattern to compensate for physical changes and prevent falls ^[2].
4. Promoting Activity: Maintaining a routine of movement helps preserve bone health ^[8]. Interestingly, research also shows that a lack of physical therapy in adults with Angelman syndrome is associated with increased levels of challenging behaviors ^[10].

Finally, do not view the use of mobility aids as a failure. As individuals age, utilizing walkers, wheelchairs, or adaptive strollers for long community outings are standard, healthy tools to preserve energy, protect joints, and maintain independence.