title: The patellofemoral joint in total knee prostheses. Design considerations.
abstract: Some desirable design features of the patellofemoral joint in a total knee arthroplasty condylar prosthesis are proposed. These are that the femoral element should be grooved, have a high anterior flange, and be circular as viewed from the side. The groove should be about 5 mm deep and have relatively vertical walls. The patellar component should have a saddle-shaped articular surface matching the femur and should be countersunk into the patella. The components should be placed so as to position the joint automatically. Results with such a design are reported; loosening, wear, dislocation, and fracture have been rare. Osteolysis of the patella has not been seen after 9 years, so that the cementless press-fit fixation of an H.D.P. patellar prosthesis to date seems safe and efficacious.
authors.affiliation: London Hospital Medical College, Bone and Joint Research Unit, England.
authors.forename: M A
authors.initials: MA
authors.lastname: Freeman
authors.forename: K M
authors.initials: KM
authors.lastname: Samuelson
authors.forename: S G
authors.initials: SG
authors.lastname: Elias
authors.forename: L J
authors.initials: LJ
authors.lastname: Mariorenzi
authors.forename: E I
authors.initials: EI
authors.lastname: Gokcay
authors.forename: M
authors.initials: M
authors.lastname: Tuke
mesh_terms: D000368:Aged; D005260:Female; D005269:Femur / Q000601:surgery; D006801:Humans; D007719:Knee Joint / Q000503:physiopathology / Q000601:surgery*; D007720:Knee Prosthesis; D008297:Male; D009068:Movement; D010146:Pain / Q000453:epidemiology; D010329:Patella; D011095:Polyethylenes; D011474:Prosthesis Design; D011475:Prosthesis Failure
chemical_list: D011095:Polyethylenes