Age-based model for metacarpophalangeal joint proprioception in elderly

Area of Science:

• Neuroscience
• Rehabilitation Medicine
• Gerontology

Background:

• Neurological injuries like stroke often cause proprioceptive deficits.
• Proprioception naturally declines with age, a critical factor as stroke predominantly affects the elderly.
• Existing age-related proprioception models are limited, especially for distal limb segments.

Purpose of the Study:

• To establish a normative proprioception model for healthy elderly individuals (55-80 years).
• To quantify the effect of aging on hand proprioception using a specific joint.
• To assess the clinical feasibility of a robotic assessment tool for proprioception.

Main Methods:

• Assessed metacarpophalangeal joint angle difference threshold in 30 healthy elderly participants.
• Utilized a robotic device for precise, passive index finger movements.
• Employed a two-alternative forced-choice paradigm with an adaptive algorithm for efficient testing (<15 minutes).

Main Results:

• Aging significantly increased the proprioceptive difference threshold at the metacarpophalangeal joint.
• Neither the tested hand nor sex significantly impacted the proprioception results.
• The robotic assessment proved rapid and reliable for quantifying proprioception.

Conclusions:

• Proprioception in the hand demonstrably declines with age in the elderly population.
• The developed age-based model serves as a crucial reference for evaluating proprioceptive deficits in stroke and other neurological conditions.
• Automated robotic tools offer a promising avenue for quantitative, rapid proprioception assessment in clinical and research settings.