Shock absorption of below-knee prostheses: A comparison between the SACH and the Multiflex foot

J. L. van Leeuwen*, L. A W M Speth, H. A M Daanen

*Corresponding author for this work

Research output: Contribution to JournalArticleAcademicpeer-review


Shock waves were measured during walking on a treadmill on the metal tube of a below-knee KBM prosthesis, provided either with a SACH foot or with a Multiflex foot. Accelerations were measured in the axial direction and the dorso-ventral direction, about 160 mm proximal to the sole of the shoe. The accelerations had comparable amplitudes to those measured on normal legs. Dorso-ventral amplitudes (order of magnitude 4 g) were generally higher than the axial amplitudes. For some patients, the SACH foot gave much higher axial accelerations than the Multitlex foot did. In the dorso-ventral direction, the SACH foot showed a moderate resonance phenomenon in the autospectral density function in the range of 40-50 Hz. The Multiflex foot showed a more variable behaviour. For both types of feet, components above 65 Hz were negligible.

Original languageEnglish
Pages (from-to)441-446
Number of pages6
JournalJournal of Biomechanics
Issue number5
Publication statusPublished - 1990


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