<prompt> All of the following statements about SACH feet are true, except:SACH stands for Solid Ankle Cushioned HealForms the base of a lower limb prosthesisMay wear out with timeWooden keel absorbs the impact of heel strike  <response>: D i.e. Wooden keel absorbs the impact of heel strike The SACH Solid Ankle Cushioned Heel foot is the most basic non aiculated foot design that forms the base or terminal pa of lower limb prosthesisQ. It has a central wooden keel and a compressible cushioned rubber foam heel. The heel absorbs the impact shock of heel strike and provides pseudoplantar flexion flexibility whereas the rigid wooden keel provides mid stance stability. Prosthetic Feet: Types SACH Solid Ankle Cushioned Heel Foot The SACH Solid Ankle Cushioned Heel foot is the most basic non aiculated foot design that forms the base or terminal pa of lower limb prosthesisQ. It has a central wooden keel and a compressible cushioned rubber foam heel. The heel absorbs the impact shock of heel strike and provides pseudoplantar flexion flexibility whereas the rigid wooden keel provides mid stance stability but very little lateral movement. Forefoot dorsiflexion is simulated by flexible toe poion distal to internal keel. - It is frequently prescribed because it is inexpansive, moderately light weight, durable, cosmetically good, with minimal maintenance bo nonmoving components. It provides good shock absorption for - moderate mainly surface level activities, has no contraindications and is available in various heel sizes so people can wear different shoes with them. - However, the rigid fore foot provides poor shock absorption for high activities. Other disadvantages include limited dorsiflexion adjustability and loss of elasticity and deterioration of heel cushion with times. Single Axis Foot Two bumpers provide limited controlled Plantar dorsiflexion at ankle.It is heavier higher maintenance foot because dust can damage bumper mechanism in comparison to SACH Multiaxial Foot - Provide movements in 3 planes and accommodates uneven walking surfaces SAFE Stationary Attachment Flexible Endoskeleton Foot -Several flexible internal keels allow triplaner movement easy roll over with stability during stance phase - Light weight and good for old people Dynamic Response Energy Storing Foot - Elastic keels absorbs energy during mid terminal stance release it during pre swing initial swing.- Examples include Seattle College Park Otto Block Quantum Flex Carbon copy II- Foot 