title: Safety and efficacy of a rotating-platform, high-flexion knee design three- to five-year follow-up.
abstract: Our hypothesis was that a high-flexion rotating-platform posterior stabilized (RP-PS) design could maximize range of motion (ROM) and improve deep-flexion activities. Eighty-seven consecutive patients (109 knees) with high-flexion RP-PS design were prospectively followed up for a minimum of 3 years. Radiographic and clinical outcomes were analyzed using Knee Society Score criteria and Western Ontario and McMaster Universities Osteoarthritis Index. Good to excellent clinical scores were achieved in 96% of the knees. There were no cases of infection, malalignment, loosening, osteolysis, or spinout. The mean preoperative ROM improved from 110.7° to 124° postoperatively. High-flexion activities such as squatting and kneeling were achieved in 62% and 60% of patients, respectively. High-flexion knee implant is safe and improves ROM and deep-flexion activities. Persistent pain is an important cause of dissatisfaction after total knee arthroplasty.
authors.affiliation: Weill Medical College of Cornell University, Hospital for Special Surgery, New York, New York 10021, USA.
authors.forename: Morteza
authors.initials: M
authors.lastname: Meftah
authors.forename: Amar S
authors.initials: AS
authors.lastname: Ranawat
authors.forename: Chitranjan S
authors.initials: CS
authors.lastname: Ranawat
mesh_terms: D000203:Activities of Daily Living; D000368:Aged; D000369:Aged, 80 and over; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D015994:Incidence; D007719:Knee Joint / Q000502:physiology* / Q000601:surgery; D007720:Knee Prosthesis / Q000009:adverse effects; D008137:Longitudinal Studies; D008297:Male; D008875:Middle Aged; D020370:Osteoarthritis, Knee / Q000601:surgery*; D010149:Postoperative Pain / Q000453:epidemiology; D017060:Patient Satisfaction; D011446:Prospective Studies; D011474:Prosthesis Design; D016059:Range of Motion, Articular / Q000502:physiology*; D012189:Retrospective Studies; D011795:Surveys and Questionnaires; D016896:Treatment Outcome