TY - JOUR
T1 - Integration of plantar soft tissue stiffness measurements in routine MRI of the diabetic foot
AU - Gefen, A.
AU - Megido-Ravid, M.
AU - Azariah, M.
AU - Itzchak, Y.
AU - Arcan, M.
PY - 2001
Y1 - 2001
N2 - Objective. A method of measuring mechanical properties of plantar soft tissues in vivo by integrating a photoelastic technique into an MRI system is presented. Background. Plantar tissue stiffening in the diabetic foot is associated with development of ulcers at the highest-pressure sites. MRI is used as an effective means of demonstrating tissue damage caused by diabetic ulceration.Design. The new measurement method uses the indentation of a sphere into the plantar tissue, which is simultaneously scanned by MRI. The indentation force is obtained using the photoelastic technique while tissue deflection is measured on the MRI scans, to yield a characteristic load-displacement curve. Methods. Applicability of the proposed method in characterizing the plantar tissue stiffness and indentation patterns of two young normal subjects and two older diabetic patients was tested. Results. Significantly higher effective shear and elastic moduli were measured for the diabetic plantar tissue compared with that of normal. For the diabetic patients, local stiffness in proximity of the 1st metatarsal head was substantially larger than in other sites, and this could be associated with initial tissue ulceration at this location. Relevance - The present method seems applicable as a practical means of identifying regions in the diabetic plantar tissue that are vulnerable to ulceration, and can be easily integrated into routine MRI scans for assessing tissue damage in these patients.
AB - Objective. A method of measuring mechanical properties of plantar soft tissues in vivo by integrating a photoelastic technique into an MRI system is presented. Background. Plantar tissue stiffening in the diabetic foot is associated with development of ulcers at the highest-pressure sites. MRI is used as an effective means of demonstrating tissue damage caused by diabetic ulceration.Design. The new measurement method uses the indentation of a sphere into the plantar tissue, which is simultaneously scanned by MRI. The indentation force is obtained using the photoelastic technique while tissue deflection is measured on the MRI scans, to yield a characteristic load-displacement curve. Methods. Applicability of the proposed method in characterizing the plantar tissue stiffness and indentation patterns of two young normal subjects and two older diabetic patients was tested. Results. Significantly higher effective shear and elastic moduli were measured for the diabetic plantar tissue compared with that of normal. For the diabetic patients, local stiffness in proximity of the 1st metatarsal head was substantially larger than in other sites, and this could be associated with initial tissue ulceration at this location. Relevance - The present method seems applicable as a practical means of identifying regions in the diabetic plantar tissue that are vulnerable to ulceration, and can be easily integrated into routine MRI scans for assessing tissue damage in these patients.
KW - Contact stress analysis
KW - Indentation
KW - Soft tissue mechanical properties
UR - http://www.scopus.com/inward/record.url?scp=0035175808&partnerID=8YFLogxK
U2 - 10.1016/S0268-0033(01)00074-2
DO - 10.1016/S0268-0033(01)00074-2
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AN - SCOPUS:0035175808
SN - 0268-0033
VL - 16
SP - 921
EP - 925
JO - Clinical Biomechanics
JF - Clinical Biomechanics
IS - 10
ER -