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Range of Motion in Total Knee Arthroplasty: A Prospective Comparison of High-Flexion and Standard Cruciate-Retaining Designs
Jong Keun Seon, MD1; Sang Jin Park, MD1; Keun Bae Lee, MD1; Taek Rim Yoon, MD1; Michal Kozanek, MD2; Eun Kyoo Song, MD, PhD1
1 Center for Joint Disease, Department of Orthopedics, Chonnam National University Hwasun Hospital, 160 Ilsim-ri, Hwasun-eup, Hwasun-gun, Jeonnam, 519-809, South Korea. E-mail address for E.K. Song: eksong@chonnam.ac.kr
2 Bioengineering Laboratories, Department of Orthopaedic Surgery, Massachusetts General Hospital, 55 Fruit Street, GRJ 1215, Boston, MA 02114
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Disclosure: The authors did not receive any outside funding or grants in support of their research for or preparation of this work. Neither they nor a member of their immediate families received payments or other benefits or a commitment or agreement to provide such benefits from a commercial entity. No commercial entity paid or directed, or agreed to pay or direct, any benefits to any research fund, foundation, division, center, clinical practice, or other charitable or nonprofit organization with which the authors, or a member of their immediate families, are affiliated or associated.
Investigation performed at the Department of Orthopedics, Chonnam National University Hwasun Hospital, Jeonnam, South Korea

The Journal of Bone and Joint Surgery, Inc.
J Bone Joint Surg Am, 2009 Mar 01;91(3):672-679. doi: 10.2106/JBJS.H.00300
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Abstract

Background: Range of motion after a total knee arthroplasty is an important indicator of clinical outcome. Recently, a high-flexion posterior cruciate ligament-retaining knee prosthesis was designed to allow greater flexion after total knee arthroplasty. The purpose of this study was to compare range of motion and functional outcomes in patients who received either a high-flexion cruciate-retaining or a standard cruciate-retaining knee replacement.

Methods: Fifty knees that had a total knee arthroplasty with a high-flexion design and fifty that had a total knee arthroplasty with a standard design were included in this study and were followed prospectively for a minimum of two years. The arcs of maximal non-weight-bearing passive flexion and weight-bearing flexion were measured, and the number of knees that allowed the patients to kneel and sit cross-legged in comfort was determined. In addition, the functional outcomes in these two groups were assessed with use of the Hospital for Special Surgery and Western Ontario and McMaster Universities Osteoarthritis Index scores.

Results: At the time of the final follow-up, the average maximal non-weight-bearing flexion was 135.3° for the knees in the high-flexion group and 134.3° for the knees in the standard group; the difference was not significant. Moreover, no significant difference was found between the groups in terms of weight-bearing flexion (124.8° in the high-flexion group and 123.7° in the standard group) and the number of knees that allowed kneeling and sitting cross-legged. The average Hospital for Special Surgery knee score was 94.4 points in the high-flexion group and 92.4 points in the standard group; the difference was not significant. The Western Ontario and McMaster Universities Osteoarthritis Index scores also showed no significant difference between the groups.

Conclusions: For knees managed with a cruciate-retaining total knee arthroplasty, those that had the high-flexion design and those that had the standard design were found to have a similar range of motion under both non-weight-bearing and weight-bearing conditions. Moreover, no significant difference was found in terms of the other functional outcomes examined.

Level of Evidence: Therapeutic Level II. See Instructions to Authors for a complete description of levels of evidence.

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    Accreditation Statement
    These activities have been planned and implemented in accordance with the Essential Areas and policies of the Accreditation Council for Continuing Medical Education (ACCME) through the joint sponsorship of the American Academy of Orthopaedic Surgeons and The Journal of Bone and Joint Surgery, Inc. The American Academy of Orthopaedic Surgeons is accredited by the ACCME to provide continuing medical education for physicians.
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