Fifteen elderly subjects with bilateral medial knee osteoarthritis (OA) and 15 healthy elderly subjects walked and crossed obstacles with heights of 10%, 20%, and 30% of their leg lengths while sagittal angles and angular velocities of each joint were measured and their phase angles (phi) calculated. Continuous relative phase (CRP) were also obtained, ie. phi(hip-knee) and phi(knee-ankle). The standard deviations of the CRP curve points were averaged to obtain deviation phase (DP) values for the stance and swing phases. Significant differences between the OA and control groups were found in several of the peak and crossing angles, and angular velocities at the knee and ankle. Both groups had similar CRP patterns, and the DP values of the hip-knee and knee-ankle CRP curves were not significantly different between the two groups. Despite significant changes in the joint kinematics, knee OA did not significantly change the way the motions of the lower limb joints are coordinated during obstacle-crossing. it appears that the OA groups adopted a particular biomechanical strategy among all possible strategies that can accommodate the OA-induced changes of the knee mechanics using unaltered inter-joint coordination control This enabled the OA subjects to accommodate reliably the mechanical demands related to bilateral knee OA in the sagittal plane during obstacle-crossing. Maintaining normal and reliable inter-joint coordination may be considered a goal of therapeutic intervention, and the patterns and variability of inter-joint coordination can be used for the evaluation of treatment effects (C) 2009 Elsevier Ltd. All rights reserved.
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Hanyang Univ, Guri Hosp, Dept Rehabil Med, Guri Si 11923, Gyeonggi Do, South KoreaHanyang Univ, Guri Hosp, Dept Rehabil Med, Guri Si 11923, Gyeonggi Do, South Korea
Park, Jae Hyeon
Lee, Hyojin
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Hanyang Univ, Dept Biomed Engn, Seoul 04763, South KoreaHanyang Univ, Guri Hosp, Dept Rehabil Med, Guri Si 11923, Gyeonggi Do, South Korea
Lee, Hyojin
Cho, Jae-sung
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Korea Orthoped & Rehabil Engn Ctr KOREC, Incheon 21417, South KoreaHanyang Univ, Guri Hosp, Dept Rehabil Med, Guri Si 11923, Gyeonggi Do, South Korea
Cho, Jae-sung
Kim, Inyoung
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Hanyang Univ, Dept Biomed Engn, Seoul 04763, South KoreaHanyang Univ, Guri Hosp, Dept Rehabil Med, Guri Si 11923, Gyeonggi Do, South Korea
Kim, Inyoung
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Lee, Jongshill
Jang, Seong Ho
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Hanyang Univ, Guri Hosp, Dept Rehabil Med, Guri Si 11923, Gyeonggi Do, South Korea
Hanyang Univ, Coll Med, Dept Rehabil Med, Seoul 04763, South KoreaHanyang Univ, Guri Hosp, Dept Rehabil Med, Guri Si 11923, Gyeonggi Do, South Korea
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Northeastern Univ, Dept Phys Therapy Movement & Rehabil Sci, Boston, MA USANortheastern Univ, Dept Phys Therapy Movement & Rehabil Sci, Boston, MA USA
James, Khara
Lanois, Corey
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Northeastern Univ, Dept Phys Therapy Movement & Rehabil Sci, Boston, MA USANortheastern Univ, Dept Phys Therapy Movement & Rehabil Sci, Boston, MA USA
Lanois, Corey
Corrigan, Patrick
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St Louis Univ, Dept Phys Therapy & Athlet Training, St Louis, MO USANortheastern Univ, Dept Phys Therapy Movement & Rehabil Sci, Boston, MA USA