title: Early failure of the porous-coated anatomic cemented unicompartmental knee arthroplasty: A 5- to 9-year follow-up study.
abstract: This retrospective study analyzed the results of 26 porous-coated anatomic unicompartmental knee arthroplasties to determine the failure rate, the mode of failure, and the presentation of the failure. The mean follow-up was 6.9 years. All patients were assessed using the American and Oxford knee scores. The revision rate was 42%4, with a mean revision time of 38.4 months. The commonest presentation of failure included pain (100%), decreased mobility (75%), swelling (58%), and giving way (50%). The commonest modes of failure included femoral loosening (55%), polyethylene wear (55%), loosening and polyethylene wear (72%), and fracture-dislocation of the femoral prosthesis (18%). The 42% failure rate of the porous-coated anatomic unicompartmental knee arthroplasty necessitates regular surveillance and prompt revision, if failing, to avoid osteolysis.
authors.affiliation: Kent and Sussex Hospital, Mount Ephraim, Tunbridge Wells, Kent, United Kingdom. carmelskyrme@clara.co.uk
authors.forename: A D
authors.initials: AD
authors.lastname: Skyrme
authors.forename: M M
authors.initials: MM
authors.lastname: Mencia
authors.forename: P W
authors.initials: PW
authors.lastname: Skinner
mesh_terms: D000368:Aged; D019645:Arthroplasty, Replacement, Knee; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D007719:Knee Joint / Q000000981:diagnostic imaging; D008297:Male; D008875:Middle Aged; D016062:Porosity; D011475:Prosthesis Failure; D011859:Radiography; D012189:Retrospective Studies; D013997:Time Factors