Abstract
Background: Foot ulceration occurs frequently on the plantar aspect of the metatarsal head region, in which the altered foot biomechanics has been mentioned as a contributor. This study attempted to compare the energy dissipation in the plantar soft tissue under the metatarsal head between type 2 diabetic patients and age-matched healthy subjects in vivo. Methods: The plantar soft tissues under the metatarsal heads in each left foot of 13 patients with type 2 diabetes mellitus and eight age-matched healthy subjects were measured with a loading-unloading device. The system comprised a 5-12 MHz linear-array ultrasound transducer and a load cell that operated at an impact velocity of about 5 cm/s. The stress-strain plot was derived by simultaneously recording the stress response and tissue deformation during a loading-unloading cycle. The energy dissipation ratio in all subjects could then be analyzed. Findings: Although only the plantar soft tissue under the fourth metatarsal head in the diabetic patients endured significantly greater energy (P = 0.035) than the healthy subjects, a trend of an increased energy dissipation ratio for the metatarsals in the diabetic patients was observed. Interpretation: The plantar soft tissue under the metatarsal head in the diabetic patients endures high dissipated energy during a simulating walking status in the study. The increased dissipated energy in the tissue may be responsible for the tissue breakdown in the diabetic patients.
Original language | English |
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Pages (from-to) | 67-73 |
Number of pages | 7 |
Journal | Clinical Biomechanics |
Volume | 22 |
Issue number | 1 |
DOIs | |
State | Published - 01 2007 |
Externally published | Yes |
Keywords
- Biomechanics
- Diabetic foot
- Metatarsus
- Ultrasonography