Velocity-controlled Knee Movements in Patients with Compression Myelopathy.

  • SAIRYO Koichi
    Department of Orthopedic Surgery School of Medicine, The University of Tokushima
  • IKATA Takaaki
    Department of Orthopedic Surgery School of Medicine, The University of Tokushima
  • KATOH Shinsuke
    Department of Orthopedic Surgery School of Medicine, The University of Tokushima
  • SAKAI Toshinori
    Department of Orthopedic Surgery School of Medicine, The University of Tokushima
  • MISHIRO Takuya
    Department of Orthopedic Surgery School of Medicine, The University of Tokushima
  • TERAI Tomoya
    Department of Orthopedic Surgery School of Medicine, The University of Tokushima
  • HIBINO Naohito
    Department of Orthopedic Surgery School of Medicine, The University of Tokushima

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Other Title
  • 圧迫性脊髄症患者の客観的下肢機能評価  膝関節等速性運動における発揮筋力の角速度特異性
  • 膝関節等速性運動における発揮筋力の角速度特異性

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Abstract

We studied velocity-controlled voluntary knee movements in 18 patients with compression myelopathy (11 males and 7 females). Mean age was 60.9 years old (range: 49 to 74 years). The patients were divided into F group (free gait, n=13) and S group (gait with support, n=5). Isometric peak torque values were measured in knee flexor and extensor muscles, and isokinetic peak torque values were determined in maximal voluntary concentric movements of those muscles at constant angle-velocities of 40, 80, 120, 160 and 180 degree/sec. The relative strength (% of isometric peak torque value) of the isokinetic motion was then calculated. The isometric strength of the knee flexor and extensors was larger in the F group than in the S group. This may suggest that the muscles in the S group had undergone disuse atrophy. In both groups, the relative strength decreased as the velocity increased, and, the degree of reduction in strength of the flexors at the high velocities of 160 and 180 degree/sec was significantly (p<0.05) greater in the S group than in the F group. These results indicated that isokinetic strength at a high velocity might reflect the gait ability in patients with compression myelopathy.

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