Microprocessor-controlled KAFO
A knee-ankle-foot orthosis that aims to detect the different phases of gait using sensor data and to adjust knee joint resistance according to the situation.
What is a microprocessor-controlled KAFO?
A microprocessor-controlled KAFO (knee-ankle-foot orthosis) is a type of KAFO that combines an orthosis frame extending from the thigh to the foot, sensors, an electronic control unit and a controlled knee joint. The term microprocessor here does not describe an anatomical level but how the knee joint is managed.
The system aims to adjust the resistance of the knee joint according to the stance and swing phases of gait by evaluating loading and movement data. Suitability is determined by assessing muscle strength, joint movement, balance, cognitive capacity, skin condition and daily goals together.
How does it work?
Sensors transmit data such as joint angle, direction of movement and loading to the control unit at regular intervals. Using this information, the software increases or decreases the resistance in the knee joint. The aim is adaptive behavior: control during the stance phase and, when needed, allowing knee flexion during the swing phase.
Electronic control does not mean that the device will move automatically and without error in every situation. Settings must be individualized; the user must receive training for different surfaces, sitting down and standing up, and emergency situations.
- Monitoring loading and joint movement with sensors
- Adjusting knee resistance according to the gait phase
- Individual software settings and mechanical alignment
- Monitoring of charging, maintenance and safety checks by the user
How it differs from other KAFO knee mechanisms
More complex technology does not mean it is more suitable for every person. A safe and functional choice is based on individual assessment.
Locked knee joint
The knee remains mechanically locked during walking. It can provide secure support, but the lock needs to be managed for sitting and swing.
Stance-control joint
Uses a mechanical or electronic arrangement designed to lock during the stance phase and to release under certain conditions for swing.
Microprocessor-controlled joint
Aims to manage knee behavior not only in an on-off manner but with resistance levels that change according to sensor data.
Assessment and safety topics
Muscle and joint condition
Hip, knee and ankle movement, muscle strength, tone and contractures are assessed in detail.
Balance and fall risk
Standing, weight shifting, turning and movement on different surfaces are observed.
Ability to manage the device
The ability to put on and take off the device, charge it, understand alerts and follow safety steps is examined.
Assistive devices
The need for a cane, crutches or a walker is assessed together with the KAFO.
Environmental conditions
Home layout, floor surfaces, steps, and the work or school environment are included in the use plan.
Follow-up and technical maintenance
The electronic system, joint, connections, straps and orthosis frame are checked regularly.
Daily life and gait training
Delivery of the device is not the end of the fitting. The user needs to learn how the knee joint behaves in different situations and practice weight shifting and step timing. Activities such as ramps, steps, uneven ground and sitting down and standing up are addressed gradually in a safe environment.
Whether an activity is possible cannot be inferred from the device class alone. The person's muscle strength, balance, other health conditions, assistive device and environmental conditions affect the outcome.
- Stance and swing control on level ground
- Safe turning, stopping and restarting
- Sitting down, standing up and controlled weight shifting
- Ramp and stair training, if appropriate
- Steps to follow when the battery runs low or a system alert occurs
From trial to regular use
Detailed assessment
Medical condition, joint movement, muscle strength, skin, balance, cognitive capacity and goals are examined.
Trial and suitability
Where possible, the potential for functional and safe use of the device is assessed with a trial setup.
Custom-made production
The orthosis frame, mechanical alignment and electronic settings are prepared according to the person's anatomy and gait.
Training
Putting on and taking off, charging, daily checks and different movement situations are practiced hands-on.
Check-ups and modifications
Skin, comfort, gait, software settings and technical parts are reassessed at scheduled check-ups.
Frequently asked questions
Is a microprocessor-controlled KAFO a prosthetic knee?
No. The person's own leg and knee are preserved; the electronically controlled joint is part of the externally applied KAFO. A prosthetic knee, by contrast, is a prosthetic component used to replace the missing joint in an above-knee or higher-level amputation.
Can every KAFO user switch to this system?
No. Joint movement, muscle strength, balance, body measurements, skin, cognitive capacity, daily goals and safety needs are assessed individually.
Does the electronic system require charging?
Systems in this class use a power source and require regular charging and checks according to the manufacturer's instructions. Charging and alert management are included in user training.
Can it be used in water?
Resistance to water and moisture varies according to the technical specifications of the device. For a specific system, only the manufacturer's instructions for use and the information provided by the fitting team should be relied on.
This content is for informational purposes; it is not a promotion of a specific product or an individual device recommendation. Suitability and fitting are determined in line with a specialist physician's assessment and prescription/medical report.
