Most people rarely think about the feeling of their feet touching the ground. But this sense is incredibly important.
It helps us know where our body is, maintain our balance, and move safely. When you unexpectedly miss a step or misjudge a curb, there is often a brief moment of panic before your foot finds solid ground again.
For some people, however, that feeling of uncertainty never goes away.
People living with conditions such as stroke, spinal cord injury, and diabetic nerve damage often lose some or all of the sensation in their feet.
Even if they still have some muscle control, not being able to feel the ground can make standing and walking difficult and dangerous.
Now, researchers have developed a new wearable system that may help solve this problem.
The device does not restore feeling to the feet directly. Instead, it sends information from the feet to another part of the body that can still sense touch.
The system consists of special pressure-sensing insoles placed inside a person’s shoes. These insoles constantly measure how weight is distributed across the feet and how that pressure changes while standing or walking.
The information is then sent wirelessly through Bluetooth to flexible bands worn on the forearms. The forearms were chosen because many people with spinal cord injuries still have good sensation there.
The bands use both vibration and heat to communicate what is happening under the feet. Quick vibrations provide immediate information about pressure changes and movement, helping users know where their weight is and when their feet are making contact with the ground.
The heat signals serve a different purpose. They indicate pressure that lasts for a longer time. This could help warn people about pressure “hot spots” that might eventually lead to injuries such as diabetic foot ulcers or pressure sores in people who spend long periods in wheelchairs or in bed.
One of the advantages of the system is that it keeps the information familiar. Instead of converting foot pressure into sounds or visual signals, the device still uses the sense of touch. It simply moves that touch information to another location on the body.
Because of this, participants learned to understand the signals surprisingly quickly. In the study, people were able to correctly interpret what the ground felt like through sensations on their arms after only about two hours of training.
Researchers also tested the system on a small group of people with stroke or spinal cord injuries. The participants showed improvements in standing balance and walked more steadily while using the device.
Another benefit is the system’s flexibility. The lightweight, wireless design can be used during everyday activities both inside and outside clinics. The position of the forearm bands can also be adjusted depending on where each person still has good sensation. The sensitivity of the insoles can be customized as well.
The research team is now working to make the technology even smaller and easier to wear. They hope that one day it could become a standard clinical tool that helps people with sensory loss regain confidence, improve mobility, and move through daily life more safely.
