35 degrees to about 55 degrees even more preferably at an angle of about 40 degrees to about 50 degrees referring now to the figures fig1 and 2 illustrate one embodiment of a prosthetic device as disclosed herein the device has a foot body a a middle body b and a top body c for attaching to a residual lower limb of an amputee the foot body has an attaching plate a u2032 and a replaceable foot portion a u2033 preferably comprising resilient material the attaching plate a u2032 is attached to the foot body a u2033 via bolting mechanisms 8 a 8 b 8 c 8 d the top body c and middle body b are movably attached via a bracket 6 a 6 b and substantially vertical spring mechanism 1 or sm 1 comprising one or more spring and a shaft and biasing the top body c and the middle body b away from each other shown is an optional second mechanism 1 u2032 and a third mechanism 1 u2033 also shown are optional upper cushion spring mechanisms 5 5 u2032 and linear bearings 22 22 u2032 to reduce friction the top body may include an anchor body 30 for anchoring to the residual lower limb of the amputee the device also includes a bracket comprising bracket arms 6 a 6 b the top body c and the middle body b are movably attached via the bracket 6 a 6 b middle body b is attached to the bracket 6 a 6 b by bolting mechanism 10 a 10 b 10 c 10 d the foot body a is movably attached to the.