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Usefulness of gait parameters obtained from inertial sensors attached to the lower trunk and foot for assessment of gait performance in the early postoperative period after total knee arthroplasty

  • Shogo Misu
    Correspondence
    Corresponding author at: Department of Physical Therapy, Faculty of Nursing and Rehabilitation, Konan Women’s University, 6-2-23, Morikita-machi, Higashinada-ku, Kobe 658-0001, Japan.
    Affiliations
    Department of Physical Therapy, Faculty of Nursing and Rehabilitation, Konan Women’s University, 6-2-23, Morikita-machi, Higashinada-ku, Kobe 658-0001, Japan

    Department of Rehabilitation, Kobe City Hospital Organization, Kobe City Medical Center, West Hospital, 2-4, Ichibancho, Nagata-ku, Kobe, Hyogo 653-0013, Japan
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  • Tsuyoshi Asai
    Affiliations
    Department of Physical Medicine and Rehabilitation, Kansai Medical University, 18-89, Uyamahigashimachi, Hirakata, Osaka 573-1136, Japan
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  • Hideki Sakai
    Affiliations
    Department of Rehabilitation, Kobe City Hospital Organization, Kobe City Medical Center, General Hospital, 2-1-1, Minatojimaminamimach, Chuo-ku, Kobe, Hyogo 650-0047, Japan
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  • Shigeru Nishiguchi
    Affiliations
    Department of Orthopedic Surgery, Kobe City Hospital Organization, Kobe City Medical Center, West Hospital, 2-4, Ichibancho, Nagata-ku, Kobe, Hyogo 653-0013, Japan
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  • Kenzo Fuse
    Affiliations
    Department of Rehabilitation, Kobe City Hospital Organization, Kobe City Medical Center, West Hospital, 2-4, Ichibancho, Nagata-ku, Kobe, Hyogo 653-0013, Japan

    Department of Orthopedic Surgery, Kobe City Hospital Organization, Kobe City Medical Center, West Hospital, 2-4, Ichibancho, Nagata-ku, Kobe, Hyogo 653-0013, Japan
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      Highlights

      • We demonstrated the usefulness of a method to assess gait using inertial sensors.
      • Patients early after TKA exhibited worse gait performance than controls.
      • The degree of recovery in gait performance after TKA might vary among individuals.
      • Some gait parameters were correlated with the clinical outcomes.

      Abstract

      Background

      This study was performed to (i) compare gait parameters obtained from inertial sensors attached to the lower trunk and foot between patients in the early postoperative period after total knee arthroplasty (TKA) and healthy age- and sex-matched controls and (ii) elucidate the association between the gait parameters and patient-reported outcome measures (PROMs).

      Method

      The gait performance of 19 patients who had undergone TKA was assessed using inertial sensors and PROMs obtained from the Knee Injury and Osteoarthritis Outcome Score (KOOS) 1 week before hospital discharge. The patients walked along a 15-m walkway and we calculated the following gait parameters: walking speed, coefficient of variation (CV) of stride time, unbiased autocorrelation coefficient (AC), harmonic ratio (HR), and symmetry index (SI). The same gait parameter data from 19 age- and sex-matched healthy adults (controls) were obtained from our past study.

      Results

      The TKA group demonstrated slower walking speed, larger CV of stride time, lower HR in all three directions, lower AC in the vertical direction, and higher SI in the vertical direction than the healthy control group (all p < 0.05). Correlation analysis revealed that the SI in the anteroposterior direction was significantly correlated with the KOOS symptoms subscore and ADL subscore (p < 0.05).

      Conclusions

      Patients in the early postoperative period after TKA exhibited worse gait performance as assessed by inertial sensors compared with healthy controls. Gait symmetry was correlated with PROMs. These results indicate the usefulness of assessing gait parameters after TKA.

      Keywords

      Abbreviations:

      TKA (total knee arthroplasty), OA (osteoarthritis), PROMs (patient-reported outcome measures), AP (anteroposterior), ML (mediolateral), VT (vertical), CV (coefficient of variation), AC (autocorrelation coefficient), HR (harmonic ratio), SI (symmetry index), ADL (activities of daily living), QoL (quality of life), KOOS (Knee Injury and Osteoarthritis Outcome Score)
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