The biomechanical properties of plantar tissues were investigated for four older neuropathic diabetic patients and four normal younger subjects. Indentation tests were performed at four high pressure areas with three postures in each subject. The tissue thickness and effective Young's modulus were measured by an ultrasound indentation system. The system comprised a pen-size probe having an ultrasound transducer at the tip and a load cell connected in series with it. Results showed that the plantar soft tissues of the elderly diabetic patients were significantly stiffer and thinner when compared with the normal young subjects.For the diabetic subjects tested, the Young's modulus at the 1st metatarsal head was significantly larger than those at the other three sites. This site dependence was not observed in the normal young subjects. The plantar tissue became significantly stiffer in the normal young subjects as a result of posture changes. This posture dependence of the Young's modulus was not established for the elderly diabetic group.
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