A foreshortened prosthesis comprising a socket, an adapter attached distally to said socket, and a foot attached to the adapter. The foot comprises a lower base plate formed as a flat peripherally-curvilinear member fixedly attached to the adapter and defining a short toe, a longer heel, and an instep there between. In addition, an upper slide plate is sandwiched between the adapter and lower base plate, but is not otherwise attached to the lower base. The upper slide plate is smaller and narrower than the lower base plate and slides there against under the weight of a heel strike, thereby serving as a leaf spring damper and suspension to smooth ambulation. This provides a BAK amputee with a more comfortable and natural gait, at a suitable angle and orientation, with smooth and comfortable flex relative to the direction of travel.