Tibion™ Bionic Leg

The Tibion™ Bionic Leg is an advanced biomechanical device. It contains pressure-sensors in a shoe insert to detect and amplify users’ movements, as well as an on-board computer to interpret those movements, and motors to assist the user in walking, sitting or standing.


It is not a prosthetic, and is not intended for long-term use. For therapy, it is simply strapped to the patient’s leg over his or her clothes. At the end of a therapy session, it is removed.
The human brain has a characteristic known as “neuroplasticity” – an incredible ability to repair and “re-wire” itself after injury caused by stroke or trauma. It can “re-learn” lost skills, such as walking, by simply repeating the necessary movements over and over.

The Tibion™ Bionic Leg helps patients regain function by letting them practice the repetitive movements associated with walking, sitting, standing and climbing stairs.

The Tibion™ Bionic Leg enables patients to “relearn” how to:

  • Stand up and sit down independently
  • Walk on normal surfaces with improved balance and gait
  • Climb stairs

Components of the Tibion™ Bionic Leg

A pressure-sensing shoe insert that detects and measures the amount of weight a patient is applying to the affected leg
A computer that adjusts the amount of support and resistance provided to the patient’s affected leg during different tasks and “predicts” what the patient will do next
Two motors to provide support and assist motion
An angle sensor in the knee to inform the computer what the patient is doing

Preparation for a rehab session with the Tibion™ Bionic Leg

  • Put a thin sensor pad into the patient’s shoe on the affected leg. This detects how much weight the patient is applying to the heel and front of the foot
  • Strap on the Bionic Leg and plugs in a signal cable from the foot sensor pad
  • Dial in the patient’s weight, and how much weight the patient must apply to the affected leg before the Bionic Leg begins to provide assistance
  • Dial in how much assistance the Bionic Leg should provide when the patient stands, sits, and climbs or descends stairs.

The Tibion Bionic Leg™ is more than a rehab tool; it’s a wearable mobility-training device. It is a vital key to providing you with greater mobility and increasing your confidence. When your therapist incorporates the AlterG Bionic Leg into your rehab:
You may see dramatic results in your mobility and strength.
It can help you re-learn functional movements.
It can provide greater support for you during walking or balance exercises.
You may experience dramatic progress towards an improved quality of life.

Mobility through versatility.

The Tibion Bionic Leg can help you take your therapy to the next level. From increasing your overall function to improving your walking and balance, the Bionic Leg is an effective tool to keep you moving on the road towards your recovery and general wellness.

A Reliable Foundation.

When used during rehab, the AlterG Bionic Leg:
Helps get you stronger during therapy sessions so you can function more independently out of therapy.
Assists your weakened or affected limb, which lets you complete more exercises during therapy.
Improves your balance and confidence during therapy, making it easier to practice walking, sit-to-stand, and stair climbing

Much of the therapeutic benefit of the Tibion Bionic Leg can be traced to its demand for active effort by the patient. The sensor in the patient’s shoe must detect a set amount of PT-chosen force applied by the patient before its motors can be activated. Information from the foot sensor, and an angle sensor in the knee, provide the onboard computer with information on whether the patient is applying force to the heel or ball of the foot, in what proportion, and in what sequence – and, based on algorithms programmed into that computer, determines what the patient is likely to be trying to do.

Because so much of gait and stepping is repetitive, the onboard computer can “think ahead” and assure the Tibion Bionic Leg is ready to provide expected assistance. Before the patient uses the Leg, the therapist asks the patient to stand, sit down and take steps. This adds information from sensors in the knee region to those transmitted from the foot, essentially “customizing” its sensor network to the patient’s way of walking.

When the patient puts no weight on the foot pressure sensor, a low-torque/high-speed motor within the Bionic Leg allows free-swinging operation, tracking the patient’s motions without impeding them. As soon as the patient applies pressure to the foot pressure sensor, and the knee angle decreases (knee extends, as when rising from a chair or climbing stairs), a high-torque/low-speed motor within the Tibion Bionic Leg provides lifting assistance (extending the knee), based on the degree of assistance dialed in by the therapist.

Conversely, when the patient applies weight to the foot pressure sensors and knee angle increases (as when sitting down or descending stairs), the high-torque motor provides braking assistance (resisting gravity while allowing knee to flex), based on the dialed-in degree of resistance.

Important note: the Tibion™ Bionic Leg is biomechanical. There is no electrical muscle stimulation, so it can be safely used by patients with pacemakers or implanted defibrillators.