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Research Article

Minimally Invasive Total Knee Arthroplasty Does Not Improve Outcomes 1 Year after Surgery: A Randomized Controlled Trial

Jennifer E Stevens-Lapsley1*, Michael J Bade2, Pamela Wolfe3, Wendy M Kohrt4 and Michael R Dayton5
1Physical Therapy Program, Department of Physical Medicine and Rehabilitation, University of Colorado, Aurora CO, USA
2 Rueckert-Hartman College for Health Professions, School of Physical Therapy, Regis University, Denver, CO, USA
3Department of Preventive Medicine and Biostatistics, University of Colorado, Aurora CO, USA
4Division of Geriatric Medicine, University of Colorado, Aurora CO, USA
5Department of Orthopedics, University of Colorado, Aurora CO, USA
Corresponding Author : Jennifer Stevens-Lapsley
MPT, PhD, Associate Professor
UCD Physical Therapy Program
Mail Stop C244, 13121 East 17th Avenue
Room 3116, Aurora, CO 80045, USA
Tel: 303-724-9170
Fax: 303-724-9016
E-mail: [email protected]
Received November 17, 2014; Accepted January 20, 2015; Published January 25, 2015
Citation: Stevens-Lapsley JE, Bade MJ, Wolfe P, Kohrt WM, Dayton MR (2015) Minimally Invasive Total Knee Arthroplasty Does Not Improve Outcomes 1 Year after Surgery: A Randomized Controlled Trial. J Clin Trials 5:207. doi:10.4172/2167-0870.1000207
Copyright: © 2015 Stevens-Lapsley JE, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

Abstract

Background: Within the past few years, minimally invasive surgical (MIS) techniques fortotal knee arthroplasy (TKA) have emerged as promising alternatives to conventional TKA, possibly because of less surgical trauma to the quadriceps. The purpose of this investigation was to evaluate the efficacy of MIS TKA outcomes compared to conventional TKA.
Methods: Forty-four patients, aged 50-85 years (64.3 ± 8.4 mean ± SD; 22 females, 22 males) who were scheduled for a unilateral TKA secondary to osteoarthritis were enrolled in a prospective randomized controlled trial. Patients were excluded if they had cardiopulmonary, neurological, or other unstable orthopedic conditions that limited function; uncontrolled diabetes; or a BMI ≥ 40 kg/m2. Patients were blinded and randomly assigned to one of two surgical groups: MIS or conventional. All patients completed a standardized course of rehabilitation following surgery. Patients were assessed preoperatively and 4, 12, 26, and 52 weeks postoperatively by a blinded evaluator; the 26- and 52-week
outcomes are the focus of the present manuscript. Outcomes included isometric quadriceps strength (primary outcome), isometric hamstrings strength, quadriceps activation, active knee range of motion (AROM), the six-minute walk (6MW) test, pain at rest and with 6MW, timed-up-and-go test (TUG), the stair climbing test, the Short Form 36 Health Status questionnaire (SF-36) the Western Ontario and McMaster Osteoarthritis Index (WOMAC), and leg muscle mass.
Results: There were no differences between groups at baseline. At 26 and 52 weeks postoperatively, there were no difference between MIS and control groups for any outcome measure.
Conclusions: Although the MIS surgical technique for TKA may lead to faster recovery of strength in patients undergoing TKA (previously reported at 4 weeks postoperatively), there is no apparent benefit of MIS on the longerterm recovery of strength or functional performance. Therefore, the benefits of MIS TKA may not outweigh the risks associated with limited surgical visualization.

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