title: Cementless and cemented total knee arthroplasty in patients younger than fifty five years. Which is better?
abstract: OBJECTIVE
  The purpose of this prospective, randomised study was to evaluate long-term clinical results, radiographic findings, complications and revision and survivorship rates in patients <55 years at a minimum of 16 years after undergoing bilateral, sequential, simultaneous, cemented and cementless total knee arthroplasties (TKAs) in the same patients.
  
  
  METHODS
  Bilateral, sequential, simultaneous TKAs were performed in 80 patients (160 knees). There were 63 women and 17 men with a mean age of 54.3 years (range 49-55), who received a cementless prosthesis in one knee and a cemented prosthesis in the other. The mean follow-up was 16.6 years (range 16-17).
  
  
  RESULTS
  At final review, the mean Knee Society (KS) knee scores (95.8 versus 96.9), Western Ontario and McMaster Universities (WOMAC) osteoarthritis (OA) index (25.4 versus 25.9), range of motion (ROM) (125° versus 128°), patient satisfaction (8.1 versus 8.3) and radiological results were similar in both groups. Femoral component survival rate was 100% in both groups at 17 years; at 17 years, the cemented tibial component survival rate was 100% and the cementless tibial component 98.7%. No osteolysis was identified in either group.
  
  
  CONCLUSIONS
  Long-term results of both cementless and cemented TKAs were encouraging in patients with OA who were <55 years. However, we found no evidence to prove the superiority of cementless over cemented TKAs.
authors.affiliation: The Joint Replacement Center, School of Medicine, Ewha Womans University, Seoul, Republic of Korea, younghookim@ewha.ac.kr.
authors.forename: Young-Hoo
authors.initials: YH
authors.lastname: Kim
authors.forename: Jang-Won
authors.initials: JW
authors.lastname: Park
authors.forename: Hyung-Mook
authors.initials: HM
authors.lastname: Lim
authors.forename: Eun-Soo
authors.initials: ES
authors.lastname: Park
mesh_terms: D000367:Age Factors; D019645:Arthroplasty, Replacement, Knee / Q000379:methods*; D001843:Bone Cements; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D015994:Incidence; D007719:Knee Joint / Q000502:physiology* / Q000601:surgery*; D007720:Knee Prosthesis; D008297:Male; D008875:Middle Aged; D020370:Osteoarthritis, Knee / Q000503:physiopathology / Q000601:surgery*; D017060:Patient Satisfaction; D011183:Postoperative Complications / Q000453:epidemiology; D011446:Prospective Studies; D016059:Range of Motion, Articular / Q000502:physiology; D012086:Reoperation / Q000706:statistics & numerical data; D016896:Treatment Outcome
chemical_list: D001843:Bone Cements