title: Unicompartmental knee arthroplasty. A 4.5-6-year follow-up study with a metal-backed tibial component.
abstract: The results in the first 50 patients to receive an improved-design unicompartmental knee prosthesis were reviewed after an average follow-up period of 5.5 years. The prosthesis is composed of a metal-backed polyethylene tibial component and a wide femoral surface replacement that are fixed to bone with acrylic cement. Forty-five patients with 55 unicompartmental knee arthroplasties were available for clinical study. Ninety-two percent of the knees were rated as having a good or excellent result, and 94% had lasting relief of pain. There have been no failures requiring revision. A radiographic review demonstrated that no tibial component was bordered by a complete radiolucent line. There was no subsidence or loosening of either the tibial or femoral components, and there was no instance of local osteolysis. These results, coupled with a 14-year follow-up experience with the original-design unicondylar prosthesis, encourages the authors to remain advocates of this procedure in selected patients with unicompartmental osteoarthritis.
authors.affiliation: Brigham Women's Hospital, Boston, Massachusetts.
authors.forename: S C
authors.initials: SC
authors.lastname: Kozinn
authors.forename: C
authors.initials: C
authors.lastname: Marx
authors.forename: R D
authors.initials: RD
authors.lastname: Scott
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D015444:Exercise; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D007719:Knee Joint / Q000000981:diagnostic imaging / Q000503:physiopathology / Q000601:surgery*; D007720:Knee Prosthesis / Q000534:rehabilitation; D008875:Middle Aged; D009068:Movement; D010003:Osteoarthritis / Q000601:surgery*; D011379:Prognosis; D011474:Prosthesis Design; D011859:Radiography