title: A long term clinical outcome of the Medial Pivot Knee Arthroplasty System.
abstract: BACKGROUND
  The ideal total knee arthroplasty (TKA) should provide maximum range of motion and functional stability for all desired daily activities and, if possible, to replicate normal knee kinematics and function. The ADVANCE® Medial Pivot (AMP) Knee System was designed with a highly congruent medial compartment and a less conforming lateral compartment to more closely mimic the kinematics of the normal knee and to offer more stability through out of range of motion (ROM). The purpose of this study was to evaluate the long-term clinical and radiographic outcomes of this TKA system.
  
  
  METHODS
  Three hundred and twenty-five (325) patients (347 knees) with knee osteoarthritis underwent a TKA using the AMP prosthesis in our Department. For evaluation, objective and subjective clinical rating systems along with radiograph series were used. The average follow-up was 15.2years.
  
  
  RESULTS
  All patients showed a statistically significant improvement (p<0.0005) in the Knee Society clinical rating system, Western Ontario and McMaster Universities Osteoarthritis Index questionnaire, SF-12® questionnaire, and Oxford knee score. The majority of patients (94%) were able to perform age-appropriate activities with a mean knee flexion of 120° (range, 105°-135°) at final follow-up. Survival analysis showed a cumulative success rate of 98.8% at 17years.
  
  
  CONCLUSIONS
  The obtained results demonstrate excellent long-term clinical outcome for this knee design.
authors.affiliation: Fourth Department of Orthopaedics & Trauma, "KAT" General Hospital, 2 Nikis str, Kifissia, 14561 Athens, Greece. Electronic address: gmacheras@gmail.com.
authors.forename: George A
authors.initials: GA
authors.lastname: Macheras
authors.affiliation: Fourth Department of Orthopaedics & Trauma, "KAT" General Hospital, 2 Nikis str, Kifissia, 14561 Athens, Greece. Electronic address: spgalanakos@gmail.com.
authors.forename: Spyridon P
authors.initials: SP
authors.lastname: Galanakos
authors.affiliation: Fourth Department of Orthopaedics & Trauma, "KAT" General Hospital, 2 Nikis str, Kifissia, 14561 Athens, Greece. Electronic address: panoslepetsos@hotmail.com.
authors.forename: Panagiotis
authors.initials: P
authors.lastname: Lepetsos
authors.affiliation: Fourth Department of Orthopaedics & Trauma, "KAT" General Hospital, 2 Nikis str, Kifissia, 14561 Athens, Greece. Electronic address: panos_anastaso@hotmail.com.
authors.forename: Panagiotis P
authors.initials: PP
authors.lastname: Anastasopoulos
authors.affiliation: Fourth Department of Orthopaedics & Trauma, "KAT" General Hospital, 2 Nikis str, Kifissia, 14561 Athens, Greece. Electronic address: snapmd@gmail.com.
authors.forename: Stamatios A
authors.initials: SA
authors.lastname: Papadakis
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D001168:Arthritis / Q000000981:diagnostic imaging / Q000601:surgery*; D019645:Arthroplasty, Replacement, Knee / Q000295:instrumentation*; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D007719:Knee Joint / Q000000981:diagnostic imaging / Q000601:surgery*; D007720:Knee Prosthesis; D008297:Male; D008875:Middle Aged; D011474:Prosthesis Design; D016059:Range of Motion, Articular
keywords: ADVANCE Medial Pivot Knee System; Long term clinical outcome; Survivorship