Primitive results after medial-pivot knee arthroplasties: a minimum 5-year follow-up study.
Paradoxical anterior movement of the femoral condyles after total knee arthroplasty (TKA) often attenuates the extension mechanism and causes a suboptimal outcome. The medial-pivot implant design aimed to confine anterior movement and emulate physiologic knee kinematics. In our study, a consecutive series of 58 medial-pivot TKA were enrolled with a minimum 5-year follow-up. The Knee Society score improved from 30.5 to 91.1 in objective and from 36.7 to 82.3 in functional scale. The average range of motion was 115.4 degrees . The medial-pivot TKA provided significant improvement in the postoperative range of motion, objective Knee Society score, pain scale, and functional score (P < .05) statistically. A larger sample and longer follow-up are recommended to draw definitive conclusions of this new implant design.
Fan
Cheng-Yu
CY
Department of Orthopaedics and Traumatology, Orthopaedic Research Center, Taipei Medical University Hospital, Taipei, Taiwan.
Hsieh
Justin Tzung-Shian
JT
Hsieh
Ming-Shium
MS
Shih
Ying-Chieh
YC
Lee
Chian-Her
CH
D000368:Aged; D000369:Aged, 80 and over; D019645:Arthroplasty, Replacement, Knee / Q000295:instrumentation* / Q000379:methods*; D001696:Biomechanical Phenomena; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D007719:Knee Joint / Q000000981:diagnostic imaging / Q000502:physiology* / Q000601:surgery; D007720:Knee Prosthesis; D008297:Male; D008875:Middle Aged; D020370:Osteoarthritis, Knee / Q000601:surgery*; D020959:Polyethylene; D011474:Prosthesis Design; D011859:Radiography; D016059:Range of Motion, Articular / Q000502:physiology*; D016896:Treatment Outcome
D020959:Polyethylene