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Safety and Efficacy of a Rotating-Platform, High-Flexion Knee Design: Three- to Five-Year Follow-Up

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.

The Journal of Arthroplasty

Volume 27, Issue 2, February 2012, Pages 201-206

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Morteza Meftah MD, Amar S. Ranawat MD, Chitranjan S. Ranawat MD

Orthopaedic Surgery, Weill Medical College of Cornell University, Hospital for Special Surgery, New York, New York

Received 28 June 2010, Accepted 3 April 2011, Available online 31 May 2011.