Ankle-Foot Orthoses: Proprioceptive Inputs and Balance Implications

Area of Science:

• Neuroscience
• Biomechanics
• Rehabilitation Engineering

Background:

• Peripheral neuropathy, common in diabetes, causes sensory loss in lower limbs, leading to postural instability and increased fall risk.
• Ankle-foot orthoses (AFOs) are known to aid balance, but their effectiveness in enhancing proprioception is less understood.
• Diabetic peripheral neuropathy significantly impacts quality of life due to impaired balance and mobility.

Purpose of the Study:

• To investigate if enhanced somatosensory cues delivered via AFOs improve postural control in individuals with diabetic peripheral neuropathy.
• To assess the impact of AFOs providing auxiliary sensory input, without ankle stabilization, on balance.
• To evaluate the effect of these specialized AFOs on static and dynamic balance tests.

Main Methods:

• Twelve individuals with diabetic peripheral neuropathy underwent static and dynamic balance tests.
• Tests were conducted with and without specially designed AFOs delivering sensory cues above the ankle.
• Participants stood on fixed and moving platforms with eyes open and closed, measuring equilibrium scores and response latencies.

Main Results:

• Equilibrium scores were significantly higher when using the modified AFOs compared to not using them.
• Response latencies were significantly shorter with the AFOs, indicating faster postural adjustments.
• The results demonstrate a clear benefit of sensory cueing AFOs for balance control.

Conclusions:

• AFOs that provide substitute proprioceptive feedback can enhance automatic postural responses in diabetic peripheral neuropathy.
• This suggests potential for improved balance and daily living activities for individuals with sensory deficits.
• Further research into designing assistive devices for proprioceptive deficits is warranted.