title: Prospective randomized comparison of high-flex and standard rotating platform total knee arthroplasty.
abstract: We sought to determine if the rotating platform (RP) high-flex design provides improved flexion compared with the standard RP total knee. A total of 142 patients were randomized to receive an RP flex (RP-F) or RP TKA. Supine flexion was measured with a goniometer and lateral x-ray. There was no difference in flexion measured at any interval between groups (1-year clinical flexion RP, 124.0°; RP-F, 124.2°; P = .949; 1-year x-ray flexion RP, 117.9°; RP-F, 117.6°; P = .985). There was no difference between groups comparing the improvement from preoperative to 1-year postoperative flexion (RP-F, 5.2°; RP, 4.1°; P = .580). There were 13 patients with postoperative patellar crepitus, with more in the RP-F group (RP-F, 11 patients [16.7%]; RP, 2 patients [3.2%]; P = .017). Owing to these results, coupled with the increased bone resection and higher cost, we no longer routinely use the RP-F design.
authors: Anderson Orthopaedic Research Institute, Alexandria, 2501 Parkers Lane, VA 22036, USA.
authors: William G
authors: WG
authors: Hamilton
authors: Supatra
authors: S
authors: Sritulanondha
authors: C Anderson
authors: CA
authors: Engh
mesh_terms: D000328:Adult; D000368:Aged; D019645:Arthroplasty, Replacement, Knee / Q000295:instrumentation* / Q000379:methods; D005260:Female; D006801:Humans; D007719:Knee Joint / Q000000981:diagnostic imaging / Q000503:physiopathology / Q000601:surgery; D007720:Knee Prosthesis; D008297:Male; D008875:Middle Aged; D020370:Osteoarthritis, Knee / Q000503:physiopathology / Q000601:surgery*; D010329:Patella / Q000000981:diagnostic imaging / Q000503:physiopathology / Q000601:surgery; D011184:Postoperative Period; D011446:Prospective Studies; D011474:Prosthesis Design; D011859:Radiography; D016059:Range of Motion, Articular / Q000502:physiology; D016037:Single-Blind Method; D016896:Treatment Outcome