Normative data for cutaneous threshold and spatial discrimination in the feet.

Area of Science:

• Neurology
• Sensory Neuroscience
• Clinical Assessment

Background:

• Normative values for foot cutaneous threshold and spatial discrimination are lacking.
• Developing clinically applicable reference values is crucial for assessing foot sensation.

Purpose of the Study:

• To establish age-related normative values for foot sensation.
• To provide reference values for cutaneous threshold (1-point static discrimination, S1PD) and spatial discrimination (2-point static [S2PD] and moving [M2PD] discrimination).
• To aid clinicians in assessing sensory deficits related to aging and nerve problems.

Main Methods:

• 196 healthy individuals were tested for foot sensation.
• Cutaneous threshold (S1PD) measured using monofilaments (0.008–300g).
• Spatial discrimination (S2PD, M2PD) assessed at five locations per foot.

Main Results:

• Significant age-dependent increases observed in S1PD, S2PD, and M2PD values.
• No significant differences in sensation between left and right feet.
• Minor gender differences in S1PD, but not S2PD or M2PD; M2PD values were generally lower than S2PD.

Conclusions:

• The study provides essential age-related normative data for foot sensory testing.
• These values assist clinicians in evaluating sensory deficits associated with aging.
• The findings help identify patients with potential underlying nerve-related conditions.