Introduction
Walking is one of the most complex movements the human body performs. For children, learning to walk and developing a normal walking pattern is a key part of physical growth. When something looks different or unusual about the way a child walks, it raises questions that need clear, objective answers.
A Pediatric Gait Analysis System is a medical technology that measures and records how a child walks. It collects detailed data on movement, muscle activity, and forces involved in each step. This information helps identify what is happening and guides decisions about treatment or therapy.
Purpose and Where It Is Used
A Pediatric Gait Analysis System is used to study walking patterns in children in a precise, measurable way. Instead of relying only on visual observation, it provides objective data that can be reviewed, compared, and used to guide clinical decisions.
Why It Is Used
- To understand abnormal walking patterns (called gait deviations)
- To plan surgical procedures and assess outcomes after surgery
- To evaluate the effect of physical therapy or orthotics (supportive devices)
- To monitor how a child's walking changes over time
- To help decide whether Botulinum toxin (Botox) injections or other interventions are needed
- To document progress and create a baseline for treatment planning
Common Conditions It Helps Assess
| Condition | How Gait Analysis Helps |
|---|---|
| Cerebral Palsy | Identifies specific muscle and joint problems causing abnormal walking |
| Spina Bifida | Assesses how nerve damage affects movement and muscle control |
| Club Foot (after treatment) | Checks if walking has normalized post-surgery or casting |
| Muscular Dystrophy | Tracks progression and evaluates response to therapy |
| Developmental Hip Dysplasia | Evaluates post-treatment outcomes |
| Leg length discrepancy | Quantifies how the difference affects gait mechanics |
| Idiopathic toe walking | Rules out neurological causes and guides management |
Where These Systems Are Found
- Pediatric hospitals and children's medical centers
- Specialized gait laboratories (gait labs)
- Orthopedic and neurology departments
- Rehabilitation and physiotherapy centers
- Academic medical research institutions
- Some advanced outpatient clinics
Types of Pediatric Gait Analysis Systems
Different technologies are used depending on the clinical setting, the level of detail needed, and available resources. Many gait labs combine more than one system together for a complete picture.
3D Motion Capture System
Uses reflective markers placed on the body and multiple cameras to track movement in three dimensions. Considered the gold standard in clinical gait analysis. Used in specialized gait labs worldwide.
Electromyography (EMG)
Measures electrical activity in muscles during walking. Surface electrodes are placed on the skin over specific muscles. Shows which muscles are active and when during the gait cycle.
Force Plates
Flat platforms embedded in the floor that measure the forces between the foot and the ground during walking. Provides data on how much force is applied and in which direction.
Pressure Measurement Systems
Measures how pressure is distributed across the foot during walking using special insoles or pressure mats. Useful for footwear and orthotic assessment.
Inertial Measurement Units (IMU)
Small wireless sensors worn on the body that use accelerometers and gyroscopes to measure movement. More portable and affordable. Used in clinics and for home-based monitoring.
Video Gait Analysis
Uses standard or high-speed cameras to record walking from different angles. A simpler and widely available method, but less precise than 3D motion capture. Often used as a first-line tool.
Computerized Walkway Systems
An instrumented mat with thousands of sensors that the child walks across. Captures footfall patterns, step length, stride width, and timing. Examples include the GAITRite system.
Dynamic Pedobarography
Specifically measures pressure under the feet during walking. Used to assess plantar (underfoot) pressure distribution, particularly useful in foot deformity management.
| System | Portability | Level of Detail | Common Setting |
|---|---|---|---|
| 3D Motion Capture | Lab-based | Very High | Specialized gait lab |
| EMG | Semi-portable | High (muscle data) | Gait lab, hospital |
| Force Plates | Lab-based | High (force data) | Gait lab |
| IMU / Wearable | Portable | Moderate | Clinic, home |
| Video Analysis | Portable | Basic to Moderate | Any clinic |
| Instrumented Walkway | Semi-portable | Moderate | Hospital, rehab |
How a Gait Analysis Session Works: Step by Step
The exact steps may vary slightly depending on the type of system and the facility, but the general process for a full clinical gait analysis follows this sequence:
Before the Session
Scheduling and Preparation
The session is scheduled at a gait lab. The child is advised to wear shorts or loose-fitting clothing so the legs are visible. Comfortable shoes normally worn by the child should be brought along. Avoid applying lotions or oils on the skin on the day of the session, as this can affect sensor and marker adhesion.
Medical History and Physical Examination
Before any equipment is applied, a detailed clinical history is collected. A physical examination is performed, including measurements of joint range of motion, muscle strength, and tone. This provides context for interpreting the walking data.
Anthropometric Measurements
Body measurements are taken - including leg length, knee width, and ankle width. These are entered into the analysis software so it can accurately calculate joint angles and positions during walking.
During the Session
Marker or Sensor Placement
For 3D motion capture: small reflective markers are attached to specific anatomical landmarks on the body using medical-grade adhesive or velcro straps. Common placements include the pelvis, thighs, knees, shins, ankles, and feet. For wearable IMU systems: sensors are strapped to segments of the body. For EMG: surface electrodes are placed on target muscles.
Static Calibration
The child stands still in a defined position while the system records a baseline reference. This tells the software where each marker or sensor is located relative to the body, and establishes the starting reference for all movement calculations.
Walking Trials
The child walks along a straight path (usually 6 to 10 metres long) at a comfortable, self-selected pace. Multiple trials (usually 3 to 5) are recorded to ensure consistency of the data. The child may walk barefoot or with footwear depending on what is being assessed. If EMG or force plates are part of the setup, these record simultaneously as the child walks.
Additional Conditions if Required
In some cases, the child is asked to walk with orthotics, after removing orthotics, with assistive devices, or after a specific intervention (such as Botox injection) to compare conditions. These are recorded as separate trials.
After the Session
Data Processing
The captured data is processed by the system software. This generates graphs and reports showing joint angles, moments, powers, EMG patterns, and spatiotemporal parameters (like step length and walking speed) throughout the gait cycle.
Interpretation and Reporting
A trained clinician (usually a physiotherapist, physiatrist, or orthopedic specialist with gait analysis expertise) reviews the data. A clinical report is generated and discussed in the context of the child's condition and treatment plan.
Precautions and Safety Considerations
Before the Session
- Inform the gait lab team of any skin conditions, open wounds, or allergies to adhesives, as markers are placed on skin
- Do not apply lotion, oil, or powder to the legs on the day of the session
- Children with conditions that make prolonged walking difficult may need additional rest breaks; inform the team in advance
- Bring any assistive devices, orthotics, or special footwear the child normally uses
- Children who are anxious or have sensory sensitivities may benefit from a pre-visit familiarisation tour of the lab
During the Session
- The walking path must be clear of obstacles to prevent trips or falls
- A trained team member should be ready to assist the child during walking at all times
- Children with balance problems or high fall risk must be supervised very closely; a spotter should walk alongside
- EMG electrodes should only be applied to intact, healthy skin. Avoid areas with rashes, cuts, or broken skin
- If the child shows signs of fatigue, pain, or distress, stop and allow rest or end the session
- For younger children or those with cognitive difficulties, cooperation may be limited; do not push beyond the child's capacity
Equipment Safety
- All equipment must be regularly calibrated and serviced as per manufacturer guidelines
- Force plates must be flush with the floor to avoid a trip hazard
- Cables and wires should be secured and out of the walking path
- Wireless sensors should have fully charged batteries before each session to avoid unexpected loss of data
Post-Session
- Remove adhesive markers gently. Use adhesive remover solution if needed to prevent skin irritation
- Check the skin at marker sites for any redness or irritation
- The child may feel physically tired after multiple walking trials, especially if they have a movement disorder
Frequently Asked Questions
Is gait analysis painful for children?
No. Gait analysis is completely non-invasive and painless. The markers and sensors placed on the body are external and do not cause any discomfort. The child simply walks.
What age of children can undergo gait analysis?
Gait analysis is most reliable in children who can walk independently and follow basic instructions - typically from around 3 to 4 years of age and older. Some systems can assess younger children with modifications, but the data quality depends on cooperation.
How long does a gait analysis session take?
A full 3D gait analysis takes approximately 1.5 to 3 hours. Simpler assessments using a walkway mat or video may take 30 to 60 minutes.
Does gait analysis involve any radiation or X-rays?
No. Standard gait analysis systems do not use any form of radiation. They use cameras, motion sensors, and electrodes only.
How often should gait analysis be repeated?
This depends on the clinical situation. It may be done once for diagnostic purposes, or repeated every 6 to 24 months to track changes over time, particularly in children with progressive conditions or after surgical interventions.
Can gait analysis be done with orthotics on?
Yes. It is often done both with and without orthotics in the same session to compare the child's walking pattern under both conditions and evaluate the effect of the orthotic.
What does a gait analysis report show?
It shows graphs and data about joint angles (how much the hip, knee, and ankle bend and straighten), joint moments and powers (the forces acting at each joint), muscle activity timing (from EMG), walking speed, step length, step width, and symmetry between the left and right sides.
Can gait analysis be done at home?
Full clinical gait analysis is a lab-based procedure. However, wearable IMU systems allow basic walking data to be collected outside the lab for monitoring purposes. These are less detailed than full lab-based assessments.
Does every child with a walking problem need gait analysis?
Not always. Many walking concerns in children can be assessed and managed with a clinical examination alone. Full gait analysis is usually recommended when the condition is complex, when surgery is being considered, or when detailed information is needed that cannot be obtained by observation alone.
Is gait analysis available worldwide?
Specialized 3D gait labs are most commonly found in larger hospitals and academic centers in higher-income countries. Simpler systems like video analysis and instrumented walkways are more widely available. Access varies significantly by region and healthcare infrastructure.
Equipment Care and Safety Maintenance
Proper maintenance of a gait analysis system ensures accurate results, longer equipment lifespan, and safe use for every child.
Daily Checks
- Inspect reflective markers and replace any that are damaged, dirty, or showing reduced reflectivity
- Check all cables for visible damage, kinks, or loose connections
- Verify that wireless sensors and transmitters are fully charged
- Confirm that force plates are clean, level, and flush with the floor surface
- Ensure the walking path (walkway) is clear of any objects
Regular Calibration
- Camera systems should be calibrated at the start of each session using the manufacturer's calibration wand or protocol
- Force plates should be zeroed before each use
- EMG systems should be checked for signal quality and electrode contact
- Calibration logs should be maintained and reviewed periodically
Periodic Maintenance
- Follow the manufacturer's scheduled service intervals for all components
- Camera lenses should be kept clean and free from dust
- Software should be kept updated to the latest stable version
- Backup all recorded data regularly to prevent data loss
- Store electrodes and disposable markers in sealed containers, away from moisture and direct sunlight
Storage Guidelines
- Store equipment in a dry, temperature-controlled environment as specified by the manufacturer
- Sensors and transmitters should be stored in their protective cases when not in use
- Force plates embedded in the floor do not require storage but should be protected from heavy loads or sharp impacts when not in use
Key Terms Simply Explained
| Term | Simple Meaning |
|---|---|
| Gait Cycle | One complete walking cycle from when one foot touches the ground to when the same foot touches the ground again |
| Gait Deviation | Any difference from normal walking pattern |
| Kinematics | The study of how joints move during walking (angles and positions) |
| Kinetics | The study of forces involved in movement (like how much force the ground pushes back on the foot) |
| EMG (Electromyography) | Measurement of muscle electrical activity |
| Spatiotemporal Parameters | Basic walking measurements like speed, step length, and stride width |
| Orthotic | A supportive device like a brace or special shoe insert |
| Reflective Marker | A small ball-shaped sticker that reflects infrared light for camera tracking |
| Force Plate | A floor-embedded measuring device that records the forces between the foot and ground |
Clinical Standards and Protocols
Gait analysis is most valuable when performed according to standardized, validated protocols. Several widely used protocols guide how markers are placed and how data is interpreted.
- Helen Hayes Marker Set: One of the most widely used marker configurations for full-body gait analysis in clinical settings
- Plug-in Gait Model: A widely accepted biomechanical model used in Vicon and similar motion capture systems
- Gillette Gait Index (GGI) / Gait Deviation Index (GDI): Summary scores that quantify overall gait quality compared to normative data
- Normalcy Index: Used in some centres to quantify deviation from normal walking patterns
Comparison to age-matched normative data is essential, as children's gait matures and changes with age up to approximately 7 to 9 years, when it stabilises to an adult-like pattern.
Suggested References and Resources
- Books: "Observational Gait Analysis" by Rancho Los Amigos National Rehabilitation Center; "Clinical Gait Analysis: Theory and Practice" by Chris Kirtley; "Human Walking" by Inman, Ralston, and Todd; "Pediatric Gait" by James Gage
- Online Resources: American Academy of Orthopaedic Surgeons (aaos.org); Gillette Children's Specialty Healthcare gait lab resources; Vicon Motion Systems clinical guides (vicon.com); Clinical Gait Analysis network (clinicalgaitanalysis.com)
- Journals: Gait and Posture (Elsevier); Clinical Biomechanics; Journal of Pediatric Orthopaedics
- Guidelines: CMAS (Children's Medical Assessment Standards) pediatric rehabilitation frameworks; WHO Rehabilitation Guidelines
Medical Disclaimer
The information provided on this page is for general educational and informational purposes only. It is not intended to replace professional medical advice, diagnosis, or treatment. All content has been written with care to reflect current, medically accurate information, but medicine is a continuously evolving field and practices may vary across institutions and regions.
Any decisions regarding the use of pediatric gait analysis, treatment planning, or management of a child's health condition must be made by a qualified healthcare professional familiar with the individual child's clinical situation. Always seek the advice of a licensed medical professional for any health-related concerns.
PediaDevices does not endorse any specific product, manufacturer, or brand mentioned in this guide. Device names and protocols are referenced for educational purposes only.