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Gait and Mobility Lab

The Gait and Mobility Lab at St. Jude Children’s Research Hospital uses advanced technology to study how patients move. 

Dr. Joshua Burns, PhD, studying patient in Gait and Mobility Lab

The Gait and Mobility Lab (GML) is a research lab that helps patients who have trouble walking. Children with cancer, neurological disorders, and other serious illnesses can develop problems with how they move.

Gait is the way a person moves their legs, feet, and body while walking. Mobility is how well someone can move around, such as walking, standing, or changing positions. 

What we do

The GML focuses on learning why patients have problems with mobility. The lab uses technology (such as wearable sensors like an Apple Watch or Fitbit, and motion-tracking cameras, like the ones used to make Pixar movies such as Toy Story) to study:

  • Gait
  • Balance
  • Muscle function
  • Coordination
  • Endurance

The GML team uses this information to look at how disease and treatment have affected your child’s mobility. The team can then plan future studies for how to improve long-term physical health in childhood cancer survivors.  

A high-tech camera in the Gait and Mobility Lab

High-tech cameras record a patient's movement as they walk across the room.

Your Gait and Mobility Lab team

The GML team includes:

  • Physical therapists and exercise physiologists: Conduct exams to understand patients’ mobility and their ability to do daily activities.
  • Biomechanist and biomechanical engineer: Use sensors and technology to measure movement patterns and identify problems.

The team works with other teams at St. Jude to help patients with specific challenges and to provide support for daily living.

What to expect during your visit

A gait assessment can take up to 3 hours. The staff encourages caregivers to stay with their child.

The assessment starts with a clinical exam. This includes things like measuring the length of your bones and how far your limbs can move (called range of motion).

The next part of the assessment includes placing reflective markers on different joints of your child’s body. The staff will ask your child to walk across the room several times.

As your child walks, 18 infrared cameras track how the markers on your child’s body move. These cameras capture movement from all directions. They use the same technology that helps create computer-generated imagery (CGI) characters in movies and animations for video games.

Your child may get tired. The team works closely with families to make sure patients feel comfortable and supported. Many children enjoy wearing the movement sensors. Some say it feels like being a robot.

Researchers may also use other sensors to measure muscle activity. They can identify conditions like spasticity.

For children who are too young or too medically fragile for a full analysis, the “magic carpet” is an option. It has more than 25,000 sensors that record movement patterns, even when children stumble or play.

Sometimes, your child may take home a wearable device, such as a watch or a shoe insert, to wear for a certain period of time. This helps us see how your child moves in their everyday environment.

The staff compares the data they collect with normal movement patterns.

Joshua Burns and Chen Yang

Gait and Mobility Lab staff study 3D images captured by the lab's advanced technology. They use the information to create personalized treatment plans for each patient.

What to wear to the GML visit

The sensors used for testing are placed on your child’s body. Your child should wear clothes that make it easy for the team to place the sensors. This includes:

  • Snug shorts and tank top
  • Everyday walking shoes
  • Sports bra (if needed)

Learn more

The Gait and Mobility Laboratory is located on the 4th floor of the Patient Care Center.