title: A randomized, prospective study of primary total knee components designed for increased flexion.
abstract: This prospective, randomized study reports early results for range of motion (ROM) after primary total knee arthroplasty. Group A received standard posterior-stabilized (PS) implants. Group B had PS implants designed for increased flexion. Average preoperative ROM was 2 degrees to 121 degrees for group A and 1.8 degrees to 122 degrees for group B. At 12-month follow-up, average ROM for group A was 0.6 degrees to 120 degrees as compared with 0.6 degrees to 133 degrees for group B (P < .05). Significantly more patients in group B flexed more than 135 degrees (P < .05). Furthermore, 12 patients (48%) in group A failed to return to preoperative ROM versus 2 patients (8%) in group B (P < .05). Although long-term follow-up is desirable, these early results support the use of PS implants designed for increased flexion.
authors.affiliation: Texas Hip and Knee Center, Texas Hip and Knee Center Adult Reconstruction Fellowship Program, Fort Worth, Texas, USA.
authors.forename: Steven H
authors.initials: SH
authors.lastname: Weeden
authors.forename: Robert
authors.initials: R
authors.lastname: Schmidt
mesh_terms: D019645:Arthroplasty, Replacement, Knee; D006801:Humans; D007719:Knee Joint / Q000503:physiopathology; D008875:Middle Aged; D011446:Prospective Studies; D011474:Prosthesis Design; D016059:Range of Motion, Articular