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J Knee Surg 2020; 33(07): 685-690
DOI: 10.1055/s-0039-1684014
Original Article
Thieme Medical Publishers 333 Seventh Avenue, New York, NY 10001, USA.

Patient-Reported Functional and Satisfaction Outcomes after Robotic-Arm-Assisted Total Knee Arthroplasty: Early Results of a Prospective Multicenter Investigation

Anton Khlopas
1   Department of Orthopaedic Surgery, Cleveland Clinic, Cleveland, Ohio
,
Nipun Sodhi
2   Department of Orthopaedic Surgery, Lenox Hill Hospital, Northwell Health, New York, New York
,
William J. Hozack
3   Department of Orthopaedic Surgery, Rothman Institute Orthopaedics, Philadelphia, Pennsylvania
,
Antonia F. Chen
4   Department of Orthopaedic Surgery, Brigham and Women's Hospital, Boston, Massachusetts
,
Ormonde M. Mahoney
5   Department of Orthopaedic Surgery, Athens Orthopaedic Clinic, Athens, Georgia
,
Tracy Kinsey
5   Department of Orthopaedic Surgery, Athens Orthopaedic Clinic, Athens, Georgia
,
Fabio Orozco
2   Department of Orthopaedic Surgery, Lenox Hill Hospital, Northwell Health, New York, New York
,
Michael A. Mont
1   Department of Orthopaedic Surgery, Cleveland Clinic, Cleveland, Ohio
2   Department of Orthopaedic Surgery, Lenox Hill Hospital, Northwell Health, New York, New York
› Author Affiliations
Further Information

Publication History

10 December 2018

18 February 2019

Publication Date:
08 April 2019 (online)

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Abstract

The purpose of this study was to perform a 3-month interim comparative analysis on outcomes between robotic-arm-assisted total knee arthroplasty (RATKA) and manual TKA patients. Specifically, we evaluated (1) patient self-reported symptoms, (2) expectations and satisfaction, and (3) functional activities, based on the 2011 Knee Society Scoring System. Between June 1, 2016, and March 31, 2018, 252 patients (102 manual and 150 robotic) were enrolled into a prospective, nonrandomized, open-label, multicenter comparative cohort study. Functional activity scores, patient-reported symptoms, as well as satisfaction and expectation scores were obtained from the 2011 Knee Society Scoring System preoperatively, at 4 to 6 weeks, and at 3 months postoperatively. Student's t-tests, Wilcoxon rank-sum tests, and chi-square tests with α set at 0.05 were used to compare between-group mean improvements from baseline. At 4 to 6 weeks postoperatively, RATKA patients were found to have significantly larger improvements in walking and standing (1.4 vs. –1.2 points; p = 0.019). RATKA patients were also found to have larger improvements in advanced activities (1.3 vs. 2.3 points), pain with walking (3.3 vs. 3.2 points), satisfaction score (12.4 vs. 12 points), and expectations score (5.1 vs. 4.4 points) when compared with manual TKA patients. At 3 months, RATKA patients were also found to have larger improvements in walking and standing (6.0 vs. 4.8 points), standard activities (11.4 vs. 10.1 points), advanced activities (6.2 vs. 4.6 points), functional activities total score (22.8 vs. 21.2 points), pain with walking (4.3 vs. 4.1 points), total symptoms score (10.5 vs. 10.3 points), satisfaction score (17.0 vs. 15.5 points), expectations score (4.8 vs. 4.0 points) when compared with manual TKA patients. The data indicate RATKA patients to have equal or greater improvements in 9 out of 10 of the Knee Society Scoring System components assessed at 3 months postoperatively, though not all findings were statistically significant. Since this is an early results report, this study will be continued for a longer follow-up, but we are encouraged by these interim results.

Keywords

robotic-arm-assisted - total knee arthroplasty - patient satisfaction - outcomes - surgical technology