Study: Patients With MicroPort’s Medial-Pivot Knee More Likely to Forget They’ve Had TKA

MicroPort Orthopedics Inc., developer and manufacturer of joint replacement implants designed to help patients achieve full function faster, announced results of a retrospective, comparative study that evaluated patient satisfaction after total knee arthroplasty (TKA) using the MicroPort Orthopedics’ Evolution Medial-Pivot (MP) Knee System and a posterior-stabilized (PS) knee system. The study showed that patients who underwent the MP-TKA scored significantly better on the Forgotten Joint Score (FJS) than those who underwent the PS-TKA, particularly with regard to deep knee flexion and stability of the prosthesis.
 
“The goal of TKA surgery is to provide a joint replacement that functions as closely as possible to a normal knee and I believe that this study further validates the superiority of the medial-pivot design over traditional designs with regard to patient outcomes,” says David Backstein, MD, MEd, FRCSC, Head of Orthopaedic Surgery at Mount Sinai Hospital in Toronto, Ontario. “MicroPort’s medial-pivot features an insert designed to promote medial stability and lateral mobility and a femoral component with constant radii of curvature, resulting in greater stability and kinematics that closely replicate the natural motion of the knee.”
 
The study, titled, “A Retrospective Comparison of a Medial Pivot and Posterior-Stabilized Total Knee Arthroplasty with Respect to Patient-Reported and Radiographic Outcomes,” was authored by Drs. David Samy and David Backstein from the Granovsky Gluskin Division of Orthopaedics at University of Toronto. A total of 164 patients, 76 in the MP-TKA group and 88 in the PS-TKA group, were evaluated at one-year follow-up using the FJS, a recently developed, validated measure of patient satisfaction after TKA. The FJS score is based on a 12-item questionnaire related to patients’ ability to forget their artificial joint in everyday life. To date, this study is the first to compare an MP-TKA and a PS-TKA using the FJS as a primary outcome measure.
 
Studies show that around 20 percent of patients are not satisfied with the outcome of their total knee replacement as a result of residual pain and functional issues that can often attributed to implant design.¹ Based on the results of this study as well as previous studies showing 95 percent patient satisfaction and 98.8 percent survivorship at 17 years, it is clear that the unique design of the MP-TKA can deliver reproducible outcomes that drive patient satisfaction.² Furthermore, it is the only medial-pivot system on the market with a clinically-proven 20-year history.
 
Established in January 2014, MicroPort Orthopedics Inc. is a multinational producer of orthopedic products and a member of the MicroPort Scientific Corporation family of companies. From its headquarters in Arlington, Tenn., MicroPort Orthopedics develops, produces, and distributes orthopedic reconstructive products. The company’s U.S.-based manufacturing and logistics capabilities deliver hip and knee products to patients and their doctors in over 60 countries, including the U.S., European, Middle Eastern, African, Japanese, Latin American, and Chinese markets.

MicroPort Scientific Corporation develops, manufactures, and markets medical devices globally. With a portfolio of products now being used at an average rate of one for every 20 seconds in thousands of hospitals around the world, MicroPort maintains world-wide operations in a broad range of business segments including cardiovascular, orthopedic, electrophysiological, endovascular, neurovascular, surgical, diabetes care, endocrinal management, and others.
 
References
1. Thambiah, Matthew Dhanaraj et al. “Patient Satisfaction after Total Knee Arthroplasty: An Asian Perspective.” Singapore Medical Journal 56.5 (2015): 259–263.
2. Macheras, George A. et al. “A long term clinical outcome of the Medial Pivot Knee Arthroplasty System.” The Knee 24 (2017): 447-453.