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Diabetes Care, Vol 15, Issue 7 905-907, Copyright © 1992 by American Diabetes Association

ARTICLES

Foot pressure measurements in diabetic and nondiabetic amputees

A Veves, ER Van Ross and AJ Boulton
Diabetes Centre, Manchester Royal Infirmary, United Kingdom.

OBJECTIVE--Foot problems are common in the remaining foot of diabetic amputees. Because high foot pressures are associated with foot ulceration, we studied foot pressures of the remaining foot of diabetic and nondiabetic unilateral amputees. RESEARCH DESIGN AND METHODS--Four age-matched groups of 11 subjects were studied. The groups were comprised of diabetic subjects with previous major amputation, nondiabetic nonneuropathic amputees, diabetic nonamputee patients with similar peripheral nerve involvement as the diabetic amputees, and nondiabetic control subjects. Vibration perception threshold (VPT) was assessed by biothesiometry and foot pressures with an optical pedobarograph. RESULTS--Mean +/- SE VPT in the diabetic amputees was significantly higher than the nondiabetic amputees (40.2 +/- 3.7 vs. 17.7 +/- 2.8 V, P less than 0.002) and similar to diabetic nonamputees (43.4 +/- 3.3 V, NS). VPT was abnormal in 9 (82%) diabetic amputees, 2 (18%) nondiabetic amputees, and 10 (91%) nonamputee diabetic patients. The mean peak foot pressure in the diabetic amputees was higher compared with nondiabetic amputees (18.3 +/- 2.2 vs. 11.3 +/- 1.4 kg/cm2, P less than 0.05) and control subjects (10.0 +/- 1.5 kg/m2, P less than 0.01), but no difference existed with diabetic nonamputees. Abnormally high foot pressures (greater than 12.3 kg/cm2) were present in 8 (73%) diabetic amputees, 3 (27%) nondiabetic amputees, 8 (73%) diabetic nonamputees, and 4 (36%) healthy subjects. CONCLUSIONS--We conclude that high pressures are present under the remaining foot in diabetic amputees, and that these pressures are associated with diabetic neuropathy. Prosthetic usage does not increase the pressures under the remaining foot in nondiabetic amputees.
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Copyright © 1992 by the American Diabetes Association.