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Yasunori Suda - One of the best experts on this subject based on the ideXlab platform.

  • knee Flexion Contracture will lead to mechanical overload in both limbs a simulation study using gait analysis
    Knee, 2008
    Co-Authors: Kengo Harato, Hideo Matsumoto, Takeo Nagura, Toshiro Otani, Yoshiaki Toyama, Yasunori Suda
    Abstract:

    The purpose of the current study was to investigate the effect of knee Flexion Contracture on the knee mechanics both in affected and contralateral limbs during gait. Ten healthy old women, with mean age of 62 years, participated. Unilateral knee Flexion Contractures of 0, 15, and 30 degrees were simulated with a knee brace. All subjects performed walking trials with or without the simulation. Net knee extension moments, net knee adduction moments (%BW Ht), external knee forces (%BW), and maximum axial loading rate (%BW/s) at the knee were calculated both in Contracture side and non-Contracture side under different Contracture conditions. Bilateral net knee extension moment gradually increased as the angle of Contracture increased. The net knee extension moments in non-Contracture limb were significantly larger with 15 and 30 degrees Contracture than those without the Contracture. Net knee adduction moment in non-Contracture limb significantly increased with 15 and 30 degrees Contracture. The knee shearing forces in Contracture side and the knee compressive force in non-Contracture side also significantly increased with 15 and 30 degrees simulation. As the Flexion Contracture became greater than 15 degrees , maximum axial loading rate also significantly increased in non-Contracture side. From our results, the knee Flexion Contracture greater than 15 degrees led to mechanical overloads in both limbs. Correction of the Contracture is clinically important to avoid any adverse effect.

  • a gait analysis of simulated knee Flexion Contracture to elucidate knee spine syndrome
    Gait & Posture, 2008
    Co-Authors: Kengo Harato, Hideo Matsumoto, Takeo Nagura, Toshiro Otani, Yoshiaki Toyama, Yasunori Suda
    Abstract:

    Knee Flexion Contracture influences the physiological movements in lower extremities and may cause the kinematic changes of the trunk. Our purpose was to investigate static and dynamic changes in trunk kinematics with simulated knee Flexion Contracture. Ten healthy females averaged 62 years participated in our study. Unilateral knee Flexion Contractures of 15 degrees and 30 degrees were simulated with a knee brace. Relaxed standing and level walking were measured at our laboratory using a motion analysis system which consisted of five cameras, a force plate, and thirteen retro-reflective markers. Three-dimensional trunk kinematics and vertical knee forces (% Body Weight) with the Contractures were compared with those without the Contracture. The 15 degrees Contracture did not significantly change trunk kinematics. However, the 30 degrees Contracture significantly changed the kinematics in each of the following planes. In the coronal plane, the trunk tilted to the Contracture side in standing and walking. In the sagittal plane, posterior inclination of the pelvis in standing significantly increased. In addition, anterior inclination of the trunk and pelvis during walking significantly increased. In the axial plane, trunk rotation to the unaffected side significantly decreased during walking. The vertical knee force in the Contracture limb decreased, being accompanied by the increase of the force in the unaffected limb during standing and walking. Results of our study suggest that knee Flexion Contracture significantly influences three-dimensional trunk kinematics during relaxed standing and level walking, and will lead to spinal imbalance. These facts may explain the onset of the "Knee-Spine Syndrome".

  • THE INFLUENCE OF KNEE Flexion Contracture ON SPINAL ALIGNMENT
    2008
    Co-Authors: Kengo Harato, Yasunori Suda, Hideo Matsumoto, Takeo Nagura, Toshiro Otani, K. Matsuzaki, Y. Toyama
    Abstract:

    Purpose: The purpose of this study was to investigate the relationship between knee Flexion Contracture and spinal alignment. Methods: Ten healthy women (mean age 62) participated in this study. Subjects were examined with posture analysis system, using twelve retro-reflective markers (placed at bilateral acromion, bilateral anterior and posterior superior iliac spine, iliaccrest, greater trochanter, lateral knee joint, lateral malleolus, lateral calcaneus, and fifth metatarsal head), five cameras and a force plate. Unilateral (only right side) knee Flexion Contractures were simulated by using a hard brace at 0, 15 and 30 degrees. First, relaxed standing was measured without simulation, and then the same measurement was performed with each simulation. The posture without brace was used as control. The shoulder tilting angle was defined by the height difference in right and left acromions. The pelvic tilting angle was defined by the height difference in right and left superior posterior iliac spines. The anterior-bent of the trunk was defined by the slope linked right acromion and right iliac crest. The posterior-bent of the pelvis was defined by the slope linked right superior anterior iliac spine and right superior posterior iliac spine. Knee resultant force (% body weight) was calculated by using inverse dynamics technique. Results: When Contracture angle increased, the trunk was significantly tilted leftward (1.4 degrees at 30 degrees Contracture), and the pelvis was significantly tilted rightward (1.8 degrees at 30 degrees Contracture). In anterior-bent of the trunk, no significant difference was detected. The posterior-bent of the pelvis was significantly increased (1.5 degrees at 30 degrees Contracture). The severer the right knee Contracture, the smaller the right knee resultant force (41.5 at controls, 28.7 at 30 degrees Contracture) and the larger the left knee resultant force (40.2 at controls, 59.9 at 30 degrees Contracture). Conclusions: This study showed the influence of knee Flexion Contracture not only in the sagittal plane, as the previous study reported, but also in the coronal plane. Severe unilateral knee Flexion Contracture can cause the lumbar spine bent convexly to the Contracture side. This may result in Knee-Spine Syndrome.

Kengo Harato - One of the best experts on this subject based on the ideXlab platform.

  • knee Flexion Contracture will lead to mechanical overload in both limbs a simulation study using gait analysis
    Knee, 2008
    Co-Authors: Kengo Harato, Hideo Matsumoto, Takeo Nagura, Toshiro Otani, Yoshiaki Toyama, Yasunori Suda
    Abstract:

    The purpose of the current study was to investigate the effect of knee Flexion Contracture on the knee mechanics both in affected and contralateral limbs during gait. Ten healthy old women, with mean age of 62 years, participated. Unilateral knee Flexion Contractures of 0, 15, and 30 degrees were simulated with a knee brace. All subjects performed walking trials with or without the simulation. Net knee extension moments, net knee adduction moments (%BW Ht), external knee forces (%BW), and maximum axial loading rate (%BW/s) at the knee were calculated both in Contracture side and non-Contracture side under different Contracture conditions. Bilateral net knee extension moment gradually increased as the angle of Contracture increased. The net knee extension moments in non-Contracture limb were significantly larger with 15 and 30 degrees Contracture than those without the Contracture. Net knee adduction moment in non-Contracture limb significantly increased with 15 and 30 degrees Contracture. The knee shearing forces in Contracture side and the knee compressive force in non-Contracture side also significantly increased with 15 and 30 degrees simulation. As the Flexion Contracture became greater than 15 degrees , maximum axial loading rate also significantly increased in non-Contracture side. From our results, the knee Flexion Contracture greater than 15 degrees led to mechanical overloads in both limbs. Correction of the Contracture is clinically important to avoid any adverse effect.

  • a gait analysis of simulated knee Flexion Contracture to elucidate knee spine syndrome
    Gait & Posture, 2008
    Co-Authors: Kengo Harato, Hideo Matsumoto, Takeo Nagura, Toshiro Otani, Yoshiaki Toyama, Yasunori Suda
    Abstract:

    Knee Flexion Contracture influences the physiological movements in lower extremities and may cause the kinematic changes of the trunk. Our purpose was to investigate static and dynamic changes in trunk kinematics with simulated knee Flexion Contracture. Ten healthy females averaged 62 years participated in our study. Unilateral knee Flexion Contractures of 15 degrees and 30 degrees were simulated with a knee brace. Relaxed standing and level walking were measured at our laboratory using a motion analysis system which consisted of five cameras, a force plate, and thirteen retro-reflective markers. Three-dimensional trunk kinematics and vertical knee forces (% Body Weight) with the Contractures were compared with those without the Contracture. The 15 degrees Contracture did not significantly change trunk kinematics. However, the 30 degrees Contracture significantly changed the kinematics in each of the following planes. In the coronal plane, the trunk tilted to the Contracture side in standing and walking. In the sagittal plane, posterior inclination of the pelvis in standing significantly increased. In addition, anterior inclination of the trunk and pelvis during walking significantly increased. In the axial plane, trunk rotation to the unaffected side significantly decreased during walking. The vertical knee force in the Contracture limb decreased, being accompanied by the increase of the force in the unaffected limb during standing and walking. Results of our study suggest that knee Flexion Contracture significantly influences three-dimensional trunk kinematics during relaxed standing and level walking, and will lead to spinal imbalance. These facts may explain the onset of the "Knee-Spine Syndrome".

  • THE INFLUENCE OF KNEE Flexion Contracture ON SPINAL ALIGNMENT
    2008
    Co-Authors: Kengo Harato, Yasunori Suda, Hideo Matsumoto, Takeo Nagura, Toshiro Otani, K. Matsuzaki, Y. Toyama
    Abstract:

    Purpose: The purpose of this study was to investigate the relationship between knee Flexion Contracture and spinal alignment. Methods: Ten healthy women (mean age 62) participated in this study. Subjects were examined with posture analysis system, using twelve retro-reflective markers (placed at bilateral acromion, bilateral anterior and posterior superior iliac spine, iliaccrest, greater trochanter, lateral knee joint, lateral malleolus, lateral calcaneus, and fifth metatarsal head), five cameras and a force plate. Unilateral (only right side) knee Flexion Contractures were simulated by using a hard brace at 0, 15 and 30 degrees. First, relaxed standing was measured without simulation, and then the same measurement was performed with each simulation. The posture without brace was used as control. The shoulder tilting angle was defined by the height difference in right and left acromions. The pelvic tilting angle was defined by the height difference in right and left superior posterior iliac spines. The anterior-bent of the trunk was defined by the slope linked right acromion and right iliac crest. The posterior-bent of the pelvis was defined by the slope linked right superior anterior iliac spine and right superior posterior iliac spine. Knee resultant force (% body weight) was calculated by using inverse dynamics technique. Results: When Contracture angle increased, the trunk was significantly tilted leftward (1.4 degrees at 30 degrees Contracture), and the pelvis was significantly tilted rightward (1.8 degrees at 30 degrees Contracture). In anterior-bent of the trunk, no significant difference was detected. The posterior-bent of the pelvis was significantly increased (1.5 degrees at 30 degrees Contracture). The severer the right knee Contracture, the smaller the right knee resultant force (41.5 at controls, 28.7 at 30 degrees Contracture) and the larger the left knee resultant force (40.2 at controls, 59.9 at 30 degrees Contracture). Conclusions: This study showed the influence of knee Flexion Contracture not only in the sagittal plane, as the previous study reported, but also in the coronal plane. Severe unilateral knee Flexion Contracture can cause the lumbar spine bent convexly to the Contracture side. This may result in Knee-Spine Syndrome.

Tomihisa Koshino - One of the best experts on this subject based on the ideXlab platform.

Han Jun Lee - One of the best experts on this subject based on the ideXlab platform.

William L. Hennrikus - One of the best experts on this subject based on the ideXlab platform.

  • ACQUIRED THUMB Flexion Contracture IN CHILDREN: CONGENITAL TRIGGER THUMB
    The Journal of bone and joint surgery. British volume, 1996
    Co-Authors: J. B. Slakey, William L. Hennrikus
    Abstract:

    We examined prospectively 4719 newborn infants to determine the congenital incidence of trigger thumb. No cases were found. Fifteen other children aged from 15 to 51 months had surgery for this condition. The anomaly had not been seen at birth and all thumbs presented with a Flexion Contracture without triggering. The condition is usually seen after birth as a Flexion Contracture of the interphalangeal joint. The term 'congenital' is a misnomer because patients acquire the deformity after birth. The term 'trigger' is inaccurate as most thumbs show a fixed-Flexion Contracture without triggering. We suggest that rather than 'congenital trigger thumb' a more appropriate description of this disorder is 'acquired thumb Flexion Contracture in children'. If the Contracture persists after one year of age, treatment by dividing the A-1 pulley is simple and effective.