J Knee Surg 2019; 32(03): 233-238
DOI: 10.1055/s-0038-1641140
Original Article
Thieme Medical Publishers 333 Seventh Avenue, New York, NY 10001, USA.

Reliability of Intraoperative Knee Range of Motion Measurements by Goniometer Compared with Robot-Assisted Arthroplasty

Hyuck Min Kwon
1   Department of Orthopedic Surgery, Yonsei University College of Medicine, Seoul, Korea
,
Ick-Hwan Yang
1   Department of Orthopedic Surgery, Yonsei University College of Medicine, Seoul, Korea
,
Woo-Suk Lee
1   Department of Orthopedic Surgery, Yonsei University College of Medicine, Seoul, Korea
,
Alvin Ray L. Yu
2   Department of Orthopedic Surgery, University of Santo Tomas Hospital, Manila, Philippines
,
Sang Yun Oh
1   Department of Orthopedic Surgery, Yonsei University College of Medicine, Seoul, Korea
,
Kwan Kyu Park
1   Department of Orthopedic Surgery, Yonsei University College of Medicine, Seoul, Korea
› Author Affiliations
Further Information

Publication History

04 December 2017

25 February 2018

Publication Date:
04 April 2018 (online)

Abstract

Accurate measurement of knee range of motion (ROM) is critical to predict the outcomes of knee surgery and prognosis. We investigated the reliability of knee ROM measurements by goniometer compared with robotic system. Fifty-three patients with medial osteoarthritis who were planning to undergo unicompartmental knee arthroplasty (UKA) with robotic UKA were prospectively enrolled. During the operation, knee ROM measurement was performed in both flexion and extension before and after insertion of the implant using both a goniometer and robotic system. The intraclass correlation coefficient (ICC) of extension measured by the goniometer and robotic system showed good agreement; however, the ICC of flexion did not show good agreement. During passive flexion, the mean values measured before insertion of the implant were significantly lower by goniometer (134.6 ± 6.43) than by robot (145.4 ± 6.80; p = 0.017); likewise, the mean values after insertion of the implant were significantly lower by goniometer (138.6 ± 6.07) than by robotic system (147.0 ± 6.60; p = 0.045). A goniometer can underestimate knee ROM measurements compared with robotic system, especially in flexion. Orthopaedic surgeons should be cautious when measuring the flexion angle with a goniometer.

 
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