title: Revision TKA with a condylar constrained prosthesis using metaphyseal and surface cementation: a minimum 6-year follow-up analysis.
abstract: BACKGROUND
  The increasing number of revision knee arthroplasty result in the more frequently use of a constraint implant but results from previous reports are difficult to interpret. The purpose of this study was to compare the long-term outcomes of superficial cemented versus metaphyseal cemented in revision total knee arthroplasty with a condylar constrained arthroplasty.
  
  
  METHODS
  The study was a retrospective analysis of clinical and radiographic outcomes in a series of revision total knee arthroplasties performed with a constrained condylar knee prosthesis and press-fit modular stems. We hypothesized that the clinical and radiographic outcome of surface cementation would be inferior to that of metaphyseal cementation. Fifty-two consecutive revision cases were followed for a median of 8.2 years (range, 6 to 10 years).
  
  
  RESULTS
  Substantial improvements in range of motion and Knee Society score were achieved in all patients, although these were not significant between groups. Significantly more radiolucent lines were visible on the tibial component with surface cementation than with metaphyseal cementation, although the clinical differences were not relevant.
  
  
  CONCLUSIONS
  Radiologic outcome was better in revision total knee arthroplasty using metaphyseal cemented revision and components with press-fit cementless stems than in the surface cementation-based approach; however, the difference was not clinically relevant.
authors.affiliation: From the Department of Traumatology and Orthopaedic Surgery, General University Hospital Gregorio Marañón, Doctor Esquerdo Street, number 46, ZIP code 28007, Madrid, Spain. Pablo.sanzruiz@gmail.com.
authors.forename: Pablo
authors.initials: P
authors.lastname: Sanz-Ruiz
authors.affiliation: From the Department of Traumatology and Orthopaedic Surgery, General University Hospital Gregorio Marañón, Doctor Esquerdo Street, number 46, ZIP code 28007, Madrid, Spain. mvillanuevam@yahoo.com.
authors.forename: Manuel
authors.initials: M
authors.lastname: Villanueva-Martínez
authors.affiliation: From the Department of Traumatology and Orthopaedic Surgery, General University Hospital Gregorio Marañón, Doctor Esquerdo Street, number 46, ZIP code 28007, Madrid, Spain. matascirac@gmail.com.
authors.forename: Jose Antonio
authors.initials: JA
authors.lastname: Matas-Diez
authors.affiliation: From the Department of Traumatology and Orthopaedic Surgery, General University Hospital Gregorio Marañón, Doctor Esquerdo Street, number 46, ZIP code 28007, Madrid, Spain. Vaquerocot@gmail.com.
authors.forename: Javier
authors.initials: J
authors.lastname: Vaquero-Martín
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D019645:Arthroplasty, Replacement, Knee / Q000009:adverse effects / Q000295:instrumentation*; D001696:Biomechanical Phenomena; D001843:Bone Cements / Q000009:adverse effects / Q000627:therapeutic use*; D005260:Female; D006801:Humans; D007719:Knee Joint / Q000000981:diagnostic imaging / Q000503:physiopathology / Q000601:surgery*; D007720:Knee Prosthesis; D008297:Male; D008875:Middle Aged; D011183:Postoperative Complications / Q000175:diagnosis / Q000601:surgery*; D011474:Prosthesis Design; D011475:Prosthesis Failure; D011859:Radiography; D016059:Range of Motion, Articular; D020127:Recovery of Function; D012086:Reoperation; D012189:Retrospective Studies; D013499:Surface Properties; D013977:Tibia / Q000000981:diagnostic imaging / Q000601:surgery; D013997:Time Factors; D016896:Treatment Outcome
chemical_list: D001843:Bone Cements