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Showing 1 to 20 of 22 for “"Ankle foot orthoses"”.
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The design and control of active ankle-foot orthoses
Ankle foot orthoses (AFOs) can be used to ameliorate the impact of impairments to the lower limb neuromuscular motor system that affect gait. Existing AFO technologies include passive devices with fixed and articulated joints, semi-active devices that modulate damping at the joint and active …
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Investigation of bench methods for determining stiffness of solid ankle-foot orthoses
The applications of ankle-foot orthoses (AFOs) are nowadays the most common treatment for the compensation of neuromuscular disorders usually caused by stroke and spinal cord or peripheral nerve injuries. The biomechanical functions of plastic AFOs are determined by their thickness, the material …
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Study of mechanical characteristics of ankle-foot orthoses using finite element analysis method
Ankle-foot orthoses (AFOs) are external devices applied to the lower leg segment in patients with ankle joint impairment due to neuromusculoskeletal disorders resulting in abnormal gait. In the last three decades, plastic AFOs have superseded conventional metal AFOs. Prescriptions of AFOs by …
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The use of Tone Relieving Ankle-Foot Orthoses in the management of children with cerebral palsy
Tone Relieving Ankle Foot Orthoses (TRAFOs) have been used in the management ofneurophysically impaired patients for some years within the United States and during thelast few years they have been introduced in the UK. The main difference between aTRAFO and a standard polypropylene ankle foot …
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Effects of two different types of ankle foot orthoses on gait outcomes in patients with subacute stroke
Ankle Foot Orthosis (AFO) is a commonly prescribed device to improve foot drop and gait in patients with stroke. The purpose of this study was to identify whether patients in the subacute stage of stroke, with foot drop, would have better gait outcomes when using a double adjustable AFO (DA AFO), …
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Sensory re-weighting for balance control and the effects of ankle foot orthoses and stance width: A comparison of people with diabetic peripheral neuropathy and healthy participants
… as adopting a wider stance width and wearing Ankle Foot Orthoses (AFOs) may also affect sensory input as well as altering the mechanics of the ankle and hip joints. The impact of distal sensory loss on the sensory control of balance in people with DPN compared to the healthy population is …
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Design of A Variable-Stiffness Ankle-Foot Orthosis Emulator
Ankle-foot orthoses (AFOs) are passive devices used to improve gait in children with cerebral palsy. They are characterized by a torsional stiffness and ankle neutral angle. For this project, a lightweight ankle exoskeleton was designed to emulate the spring-like behavior of a traditional AFO for a …
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Design and control of an active ankle-foot orthosis
Active ankle-foot orthoses (AAFOs) assist a user unable to dorsiflex the ankle joint. The optimal AAFO is lightweight and aids the user in achieving a nominal gait. This thesis presents the design and control of a novel discrete nonlinear series elastic actuator for AAFOs. The actuator uses …
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Identification, Simulation and Control of an Ankle Foot Orthosis
Drop foot is a neuromuscular condition affecting many patients with abnormality in the walking pattern. The most common treatment to address this condition is ankle foot orthoses. This research presents a study on development of an identified model for a torsional shape memory alloy-based ankle …
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The effect of wedge height on the gait of normal subjects wearing a swift cast
… rehabilitation goals for stroke patients. Ankle foot orthoses (AFOs) are regularly prescribed to help achieve this goal for stroke patients who have suffered from strokes or other neurological disorders with lower limb disabilities. When customising AFOs evidence suggests that tuning the …
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The effect of ankle-foot orthosis on gait and the procedures used to assess bi-articular muscle length and spasticity in subjects with diplegic cerebral palsy
Ankle-foot orthoses are commonly prescribed amongst subjects with diplegic cerebral palsy as a conservative orthotic intervention. Multi-articular and bi-articular muscles are more severely involved in subjects with diplegic cerebral palsy. Appropriate clinical assessment including assessment of …
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Measuring the functional and clinical effectiveness of a passive dynamic ankle foot orthosis when used to rehabilitate complex limb salvage post lower limb blast trauma
Summary: Studies suggest passive dynamic ankle foot orthoses (PD AFO) are effective at improving gait and patient reported outcomes measures (PROM) in personnel who have undergone limb salvage due to blast trauma. Studies using PD AFOs have included able bodied and personnel with variable clinical …
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Individual plantar flexor compensation during walking with a unilateral passive dynamic ankle-foot orthosis : a simulation study
Ankle foot orthoses (AFOs) are designed to improve walking ability in persons with a variety of musculoskeletal and neuromuscular disorders. Passive dynamic AFOs (PD-AFOs) are a special class of orthoses that function like a torsional spring, which store elastic energy in early stance and release …
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The direct effects of variations in AFO stiffness on the kinematics and kinetics of gait
… in combination with physical therapy. Briefly, orthoses, and in particular ankle-foot orthoses (AFOs), are externally applied devices designed to maintain the foot in a desirable position with respect to the shank. Currently, the prescription and design of orthoses is still based on the …
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Evaluation of gait kinematics and kinetics using a powered ankle-foot orthosis for gait assistance in people with multiple sclerosis
… For people with MS who suffer from drop foot (i.e., the diminished or lack of ability to dorsiflex the foot), prescription of a passive ankle-foot orthosis is common. The purpose of these devices is to hold the foot in neutral position and prevent the foot from dropping during forward …
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Adaptive gait strategies of healthy individuals walking with a novel bi-linear stiffness ankle-foot orthosis
Ankle-foot orthoses are a category of biomechanical assistive devices intended to address a variety of gait impairments by providing support and stability about the ankle joint. Passive-dynamic AFOs (PD-AFOs) are broadly designed with a foot plate, a cuff that wraps around the shank, and a strut …
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Understanding the effects of wearing a quantitatively prescribed passive-dynamic ankle-foot orthosis on the mechanical cost-of-transport and gait velocity in individuals post-stroke
… are commonly prescribed passive-dynamic ankle-foot orthoses (PD-AFOs) to aid in the control of shank forward rotation during mid-to- terminal stance due to plantar flexor weakness. PD-AFO bending stiffness is a key orthotic characteristic that can assist the plantar flexor muscles by …
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Design of actuation system and minimization of sensor configuration for gait event detection for Gen 3.0 Portable Powered Ankle-Foot Orthosis (PPAFO)
Powered ankle-foot orthoses (AFOs), which are capable of providing assistive torque at the ankle joint, have significant potential as both assistance and rehabilitation devices. Technology advancements have led to great progression in the development of powered AFOs. Our group had developed the …
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The evaluation of and comparative evidence for two types of interventional devices for foot-drop of central neurological origin
Introduction This thesis focusses on ankle foot orthoses (AFO) and functional electrical stimulation (FES) for the correction of foot-drop. It consists of two parts linked through identification of three gaps in the knowledge base: 1) limitations in device design, 2) limitations in device …
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A Dynamic Ankle Orthosis for Alleviating Mechanical Foot and Ankle Pain, Preserving Joint Motion, and Restoring Patient Function
… million Americans visit the doctor each year for foot and ankle pain stemming from a degenerative condition or injury. Standard of care ankle-foot orthoses have been shown to effectively manage pain symptoms of the lower limb, but they can also significantly hinder joint motion and limit function. …
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