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Lower extremity exercise of knee osteoarthritis patients using portable assistive robot (HEXAR-KR40P)

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Abstract

We studied newly developed assistive robot movement (ARM, HEXAR-KR40P) equipment, and compared with conventional continuous passive movement (CPM) equipment, focusing on range of motion (ROM) and strengthening of knee joint muscles. 110 osteoarthritis (OA) patients were recruited from five different clinics. At first, eighty patients were enrolled to evaluate the subjective satisfaction of ARM. Secondly, thirty patients were enrolled to find the effectiveness of ARM including ROM and strength compared with CPM. Subjects in first study performed exercise for two weeks. Exercise was performed with CPM and ARM for ten minutes alternately. Subjects in second study performed exercise with ARM only 30 min/day for two weeks, and measured ROM, strength, and functional changes. Obtained data was analyzed with Wilcoxon signed rank test. As a result, higher subjective satisfaction with ARM in patients and researchers survey was noted compared with CPM (p<0.05). Active and passive ROMs of knee flexion were significantly improved after ARM exercise. Strength of knee muscles, timed up and go test (TUGT), sit-and-stand-up of short physical performance battery (SPPB) score were also significantly improved after ARM exercise. Findings suggest that ARM equipment performed better than CPM equipment for knee OA patients to increase in ROM and strength.

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Abbreviations

OA:

osteoarthritis

TKR:

total knee joint replacement

ARM:

assistive robot movement (HEXAR-KR40P)

CPM:

continuous passive movement

ROM:

range of motion

BMI:

body mass index

TUGT:

timed up and go test

SPPB:

short physical performance battery

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Authors and Affiliations

  1. Department of Rehabilitation Medicine, Hanyang University College of Medicine, 222, Wangsimni-ro, Seongdong-gu, Seoul, South Korea, 133-791

    Mi Jung Kim, Dong Hun Lee, Taikon Kim & Seongho Jang

  2. Department of Rehabilitation Medicine, Kyung Hee University College of Medicine, 3-10, Hyungheedae-ro 6-gil, Dongdaemun-gu, Seoul, South Korea, 130-872

    Hee-Sang Kim & Jinmann Chon

  3. Department of Rehabilitation Medicine, Kang-Dong Kyung Hee University College of Medicine, 892, Dongnam-ro, Gangdong-gu, Seoul, South Korea, 134-727

    Seung Don Yoo

  4. Department of Orthopaedic Surgery, Cheil General Hospital & Women’s Healthcare Center, 17, Seoae-ro 1-gil, Jung-gu, Seoul, South Korea, 100-380

    Jae Yong Ahn

  5. Department of Mechanical System Engineering, Hansung University, 116, Samseonguo-ro 16-gil, Seongbuk-gu, Seoul, South Korea, 136-792

    Jungsoo Han

  6. Department of Mechanical Engineering, Hanyang University, 222, Wangsimni-ro, Seongdong-gu, Seoul, South Korea, 133-791

    Hye-Youn Jang & Deok-Won Yun

  7. Department of Mechanical Engineering, Hanyang University, 55, Hanyangdaehak-ro, Sangrok-gu, Ansan-si, Gyeonggi-do, South Korea, 426-791

    Changsoo Han

Authors
  1. Mi Jung Kim
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  2. Dong Hun Lee
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  3. Taikon Kim
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Correspondence to Changsoo Han.

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Kim, M.J., Lee, D.H., Kim, T. et al. Lower extremity exercise of knee osteoarthritis patients using portable assistive robot (HEXAR-KR40P). Int. J. Precis. Eng. Manuf. 15, 2617–2622 (2014). https://doi.org/10.1007/s12541-014-0635-z

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  • DOI: https://doi.org/10.1007/s12541-014-0635-z

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