title: Minimum five-year follow-up results of single-radius, high-flex posterior-stabilized TKA.
abstract: We studied 75 primary total knee arthroplasties (TKAs) performed using a single-radius, high-flex posterior-stabilized insert design with a minimum 5-year follow-up to document its implant specific complications and clinical results. Nonprogressive osteolysis was observed at zone 4 of the femoral component in 6 knees (8%) and at zone 1 of the tibial component in 6 knees (8%). However, no complications associated with high flexion designs, such as early aseptic loosening, were observed.Preoperatively, mean Knee Society Knee Score and Knee Society Function Score were 55.1 and 45.5, respectively (range, 10-83 and 20-80, respectively). At last follow-up, mean Knee Society Knee Score and Knee Society Function Score improved to 94.9 and 85.9, respectively (range, 70-100 [P<.0001] and 45-100 [P<.0001], respectively). Mean maximal flexion was 122.1 degrees (range, 90 degrees -140 degrees ) and mean range of motion (ROM) was 110.3 degrees (range, 80 degrees -135 degrees ) preoperatively, and these values improved to 128.9 degrees (range, 110 degrees -150 degrees [P<.0001]) and 127.8 degrees (range, 110 degrees -150 degrees [P<.0001]), respectively, at last follow-up. Preoperative ROM was found to be the only factor significantly correlated with postoperative ROM at last follow-up by univariate (P=.0020) and multivariate analysis (P<.0067). Accordingly, clinical results were comparable to previous reports of high-flex implants without implant-specific complications.
authors.affiliation: Department of Orthopedic Surgery, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, South Korea.
authors.forename: Young-Wan
authors.initials: YW
authors.lastname: Moon
authors.forename: Jai-Gon
authors.initials: JG
authors.lastname: Seo
authors.forename: Moon Jong
authors.initials: MJ
authors.lastname: Chang
authors.forename: Jae-Hyuk
authors.initials: JH
authors.lastname: Yang
authors.forename: Sung-Won
authors.initials: SW
authors.lastname: Jang
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D015897:Comorbidity; D019544:Equipment Failure Analysis; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D007593:Joint Instability / Q000175:diagnosis / Q000453:epidemiology* / Q000601:surgery*; D007720:Knee Prosthesis / Q000706:statistics & numerical data*; D008297:Male; D008875:Middle Aged; D020370:Osteoarthritis, Knee / Q000175:diagnosis / Q000453:epidemiology* / Q000601:surgery*; D011183:Postoperative Complications / Q000453:epidemiology*; D015995:Prevalence; D011474:Prosthesis Design; D016059:Range of Motion, Articular; D020127:Recovery of Function; D056910:Republic of Korea / Q000453:epidemiology; D012307:Risk Factors; D016896:Treatment Outcome