title: Lateral unicompartmental knee arthroplasty: survivorship and technical considerations at an average follow-up of 12.4 years.
abstract: Successful medial unicompartmental knee arthroplasty is becoming standard; however, the "screw-home" mechanism, internal femoral rotation on a fixed tibia as the knee is fully extended, should be taken into account with lateral compartment arthroplasty. Twenty-nine consecutive lateral unicompartmental arthroplasties were performed with our unique tibial component positioning in 10 degrees to 15 degrees of internal rotation to compensate for the "screw-home" mechanism. The Hospital for Special Surgery knee score and serial radiographs were used in the evaluation of each patient. The mean duration of follow-up was 12.4 years with no revisions. The HSS score was excellent or good in all knees. The average postoperative femoral-tibial alignment was 5 degrees of valgus, and the average posterior tibial slope was 6 degrees . Lateral unicompartmental arthroplasty can provide excellent long-term results with modified positioning of the tibial component.
authors.affiliation: Botsford General Hospital, Farmington Hills, Michigan, USA.
authors.forename: Donald W
authors.initials: DW
authors.lastname: Pennington
authors.forename: John J
authors.initials: JJ
authors.lastname: Swienckowski
authors.forename: William B
authors.initials: WB
authors.lastname: Lutes
authors.forename: Gregory N
authors.initials: GN
authors.lastname: Drake
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D019645:Arthroplasty, Replacement, Knee / Q000379:methods*; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D008875:Middle Aged; D020370:Osteoarthritis, Knee / Q000000981:diagnostic imaging / Q000601:surgery*; D011859:Radiography; D015996:Survival Rate; D016896:Treatment Outcome