A long term clinical outcome of the Medial Pivot Knee Arthroplasty System

• Published in: The knee 2017-03, Vol.24 (2), p.447-453
• Main Authors: Macheras, George A, Galanakos, Spyridon P, Lepetsos, Panagiotis, Anastasopoulos, Panagiotis P, Papadakis, Stamatios A
• Format: Article
• Language: English
• Subjects: ADVANCE Medial Pivot Knee System; Age; Aged; Aged, 80 and over; AMP; Arthritis - diagnostic imaging; Arthritis - surgery; Arthroplasty (knee); Arthroplasty, Replacement, Knee - instrumentation; Clinical outcomes; Female; Follow-Up Studies; Gangrene; Humans; Joint surgery; Kinematics; Knee; Knee Joint - diagnostic imaging; Knee Joint - surgery; Knee Prosthesis; Long term clinical outcome; Male; Middle Aged; Orthopedics; Osteoarthritis; Polyethylene; Prostheses; Prosthesis Design; Range of Motion, Articular; Rheumatoid arthritis; Skin & tissue grafts; Statistical analysis; Studies; Surgeons; Survival analysis; Survivorship
• ISSN: 0968-0160; 1873-5800
• DOI: 10.1016/j.knee.2017.01.008

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 15.2 years. 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 17 years. Conclusion The obtained results demonstrate excellent long-term clinical outcome for this knee design.