Abstract: An improved surgical procedure for orthopedic implantation of a prosthesis where the conventional metal prosthesis is provided with an integral collar of a bone cement compatible polymer coating of a desired thickness and shape. The collar thickness serves to operably effect a seal with the bone so the prosthesis becomes a pressurizing plunger during the last phase of inserting the prosthesis into the bone opening or cavity. A slowly developing pressure build up of the viscous bone cement provided by the tapered shape of the collar thickness assures bone cement flow into all bone crevices and minimizes bone cement porosity by reducing the size of the voids formed by entrapped air during curing of the bone cement. The preformed collar also provides a predetermined thickness or layer of bone cement at the critical structural locations in order to ensure the surgeon of optimum physical characteristics of the bone cement at that location and avoid direct contact of the metal prosthesis with the bone.

Abstract: A lock is provided which is adaptable to heavy equipment, such as truck tractors or earth-moving vehicles, for equipment security. The equipment lock includes an elongated shackle with a split ferrule bondingly associated at one end. The split ferrule is received by a casing in which the split ferrule is lockingly engaged by a slidable yoke member actuated both for locking and release by key operation through means of a cam assembly. An enlarged member is at the shackle second end. The heavy equipment lock may be made to be water-tight when locked. In one embodiment, the shackle is flexible and formed into an adjustable bight to secure vehicle wheels. In a second embodiment the shackle is a rigid, "L" shaped bar.