title: A clinical and radiostereometric study of the cemented PFC-sigma prosthesis: a 5-year study of 29 cases with a fixed bearing.
abstract: The press-fit condylar (PFC) cruciate-retaining total knee prosthesis is well documented in the literature. In 1997, a modification of the femoral component was introduced, and the prosthesis was renamed PFC-Sigma. The alteration may influence the migratory and rotational pattern of the tibial component and thus long-time survival rate. In this radiostereometric analysis, we found that the micromotion of the PFC-Sigma prosthesis differs slightly from the original PFC design, an advantage of the PFC-Sigma prosthesis. The median maximum total point motion at 5 years was 0.64 mm for the PFC-Sigma design and 0.79 mm for the previous version of PFC (P = .9). However, the PFC-Sigma rotated less around the transverse (x) axis than did the PFC (medians, 0.22 mm and 0.48 mm, respectively; P = .04). From the radiostereometric, radiographic, and clinical data, we conclude that the PFC-Sigma knee prosthesis can be used with confidence.
authors.affiliation: Department of Orthopaedics, Malmö University Hospital, SE-205 02 Malmö, Sweden.
authors.forename: Thord
authors.initials: T
authors.lastname: von Schewelov
authors.forename: Jack
authors.initials: J
authors.lastname: Besjakov
authors.forename: Lennart
authors.initials: L
authors.lastname: Sanzén
authors.forename: Ake
authors.initials: A
authors.lastname: Carlsson
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D019645:Arthroplasty, Replacement, Knee; D001843:Bone Cements; D005260:Female; D006801:Humans; D007719:Knee Joint / Q000000981:diagnostic imaging* / Q000601:surgery; D007720:Knee Prosthesis; D008297:Male; D008875:Middle Aged; D009068:Movement; D017060:Patient Satisfaction; D011857:Radiographic Image Interpretation, Computer-Assisted / Q000379:methods*; D012399:Rotation; D016896:Treatment Outcome
chemical_list: D001843:Bone Cements