Quantifying Dynamic Changes in Plantar Pressure Gradient in Diabetics with Peripheral Neuropathy

Area of Science:

• Biomechanics
• Diabetology
• Orthopedics

Background:

• Diabetic foot ulcers are a severe complication of diabetes.
• Peak plantar pressure (PPP) and peak pressure gradient (PPG) are associated with ulcer development.
• Understanding plantar pressure mechanics is crucial for preventing diabetic foot ulcers.

Purpose of the Study:

• To investigate the utility of pressure gradient angle (PGA) in assessing diabetic foot ulcer risk.
• To hypothesize that at-risk diabetic individuals exhibit smaller PGAs in key foot regions.

Main Methods:

• Studied 27 participants (19 diabetics with neuropathy, 8 controls).
• Measured plantar pressures during walking using a specialized system.
• Calculated PPP, PPG, and PGA for the first toe (T1), first metatarsal head (M1), second metatarsal head (M2), and heel (HL).

Main Results:

• Diabetic group showed significantly higher PPP and PPG in T1 and M1 regions compared to controls.
• PGA was significantly smaller in the diabetic group in the T1 region (46% reduction, P=0.04).
• Smaller PGA suggests a more concentrated pressure gradient pattern under the toe in diabetics.

Conclusions:

• The pressure gradient angle (PGA) may offer new insights into the mechanical factors contributing to diabetic foot ulceration.
• Findings suggest that altered pressure gradient patterns, quantified by PGA, are associated with diabetes and peripheral neuropathy.