Surgery – Instruments – Orthopedic instrumentation
Patent
1987-01-22
1989-11-21
Rosenbaum, C. Fred
Surgery
Instruments
Orthopedic instrumentation
623 22, A61F 104
Patent
active
048815365
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. The collar also functions as a positioning mechanism to assit the surgeon in proper positioning of the prosthesis. The precoated prosthesis is also disclosed and claimed.
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Noble Phillip C.
Tullos Hugh S.
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