Abstract: A ladder having a foot having a plastic body with a recess which receives the end of a first rail and is positioned about and conforms to the web and the first and second flanges of the first rail. The foot has a plastic base having a top side from which the body extends. The base has a front edge. The foot has a metal rail fastener which extends through the body and the rail to attach the body and the rail together. The foot has a pad having a rigid plate with a rubber outer layer surrounding the rigid plate and a pad fastener hole that extends entirely through the rigid plate and rubber outer layer, the outer layer of the pad having a bottom with treads. The foot has a metal pad fastener that extends entirely through the pad and entirely through the base to attach the pad to the base so the rigid plate is between the treads and the base of the shell. A ladder foot. A method.

Abstract: A computing device uses a plurality of images of arthroplasty to measure implant position. A virtual three-dimensional model is generated using at least some of the plurality of images. Moreover, the computing device configured in accordance with the present application simulates, as a function of the virtual three-dimensional model, movement at the site. As a function of the simulating, the computing device determines occurrence, location and type of impingement, and identifies, using the determined location and type of the impingement, a plurality of surgical plans for treating the impingement, wherein each of the surgical plans has a respective degree of treatment effectiveness and a respective degree of invasiveness. Further, the computing device selects one of the surgical plans in accordance with the selected plan's predetermined respective degree of effectiveness and in accordance with the selected plan's predetermined respective degree of invasiveness.

Abstract: A ladder having a foot having a plastic body with a recess which receives the end of a first rail and is positioned about and conforms to the web and the first and second flanges of the first rail. The foot has a plastic base having a top side from which the body extends. The base has a front edge. The foot has a metal rail fastener which extends through the body and the rail to attach the body and the rail together. The foot has a pad having a rigid plate with a rubber outer layer surrounding the rigid plate and a pad fastener hole that extends entirely through the rigid plate and rubber outer layer, the outer layer of the pad having a bottom with treads. The foot has a metal pad fastener that extends entirely through the pad and entirely through the base to attach the pad to the base so the rigid plate is between the treads and the base of the shell. A ladder foot. A method.