The Solid Ankle Cushion Heel (SACH) foot represents a basic, durable, inexpensive prosthetic foot option geared toward those who require limited walking and have little variation in speed and types of terrain. SACH feet consist of a soft material molded over a more rigid inner piece that mimics the shape of a human foot. This type of foot may be used with patients' very first prosthesis after amputation.
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The SACH foot has sufficient shock absorption characteristics for limited walkers because of its large heel cushion, but due to its lack of flexibility and inability to accommodate uneven terrain, it is not ideal for moderate to high activity prosthesis users that desire to do more than household activities.
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Your clinician will work with you to make the most appropriate decision based on your specific needs and goals.
This study evaluated biomechanical and metabolic performance differences between two prosthetic foot designs in light of their mechanical properties. Ten unilateral below-knee amputee subjects, at least 1 year after amputation, capable of walking and running, were studied. Differences in heel and forefoot compliance explained differences in gait events and alignment. Increased efficiency of pushoff in the Seattle Ankle/Lite Foot exists as evidenced by the decrease loading on the opposite limb during double support and a less shortened step length on the sound side compared to the SACH foot. The natural frequency of oscillation for the prosthetic feet was determined to be too high to provide energy storage and release synchronized with kinematic requirements because neither metabolic cost savings nor differences in metabolic efficiency were found. Comfortable walking speed and the nadir of metabolic rate and efficiency are not different. Via accelerometer measurement, it was found that the more compliant and lossy SACH foot heel was less likely to transmit high frequency vibration.
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