title: Range of motion and patient satisfaction with traditional and high-flexion rotating-platform knees.
abstract: Although a high degree of flexion is necessary for some activities of daily living, most total knee arthroplasty implants are designed to provide only up to 120° of flexion. Some new designs claim to provide greater flexion. In this retrospective study, we evaluated the Sigma rotating-platform high-flex knee against the traditional Sigma rotating-platform knee (DePuy, Warsaw, IN). There were 153 knees evaluated. We matched the subjects primarily on preoperative flexion and had 64 matched pairs. We also evaluated the knees based on their preoperative flexion, either <120° or ≥120°. In comparing the two implants, there were no significant differences in the patients' overall satisfaction, flexion gained or lost, or the need for further surgery. This study was approved by an institutional review board.
authors.affiliation: Miller Orthopaedic Affiliates, P.C., Council Bluffs, IA, USA. ckboese@msn.com
authors.forename: Clifford Kent
authors.initials: CK
authors.lastname: Boese
authors.forename: Theresa J
authors.initials: TJ
authors.lastname: Gallo
authors.forename: Carla J
authors.initials: CJ
authors.lastname: Plantikow
mesh_terms: D019645:Arthroplasty, Replacement, Knee / Q000295:instrumentation / Q000379:methods*; D005260:Female; D006622:Hip Prosthesis; D006801:Humans; D007719:Knee Joint / Q000502:physiology / Q000601:surgery; D008297:Male; D016555:Matched-Pair Analysis; D008875:Middle Aged; D017060:Patient Satisfaction; D011183:Postoperative Complications / Q000517:prevention & control; D011474:Prosthesis Design; D016059:Range of Motion, Articular / Q000502:physiology*; D012189:Retrospective Studies
references.citation: J Bone Joint Surg Am. 2005 Jul;87(7):1470-5
references.pmid: 15995113
references.citation: J Arthroplasty. 2005 Aug;20(5):674-9
references.pmid: 16310007
references.citation: Orthopedics. 2006 Sep;29(9 Suppl):S28-9
references.pmid: 17002144
references.citation: Knee Surg Sports Traumatol Arthrosc. 2007 Apr;15(4):350-5
references.pmid: 17072657
references.citation: J Bone Joint Surg Am. 2009 Mar 1;91(3):672-9
references.pmid: 19255229
references.citation: J Bone Joint Surg Br. 2008 Jan;90(1):37-42
references.pmid: 18160497
references.citation: Orthopedics. 2006 Sep;29(9 Suppl):S49-52
references.pmid: 17002149
references.citation: J Arthroplasty. 1987;2(2):95-7
references.pmid: 3612145