P-3-09-10
Gait analysis of the patients with varus osteoarthritic knees
Tsumura, N., Komura, T., Toyoda, Y., Takada, S., Fujita, H., Sawamura, S.
(Hyogo Rehabilitation Center, Kobe, Japan)
PURPOSE: It has been reported that patients with varus osteoarthritic (OA) knees show abnormal lateral movement of the knees in the stance phase. The purpose of this study was to evaluate lateral thrust using gait analysis system.
MATERIALS AND METHODS: An ELITE system (Version 5.4, Bioengineering Technology and system, Italy), two force platforms (z13126, Kistler, Swizerland) were used for gait analysis. The distance of lateral knee movement was calculated from the kinematic data. 1 7 knees of 1 3 patients with severely destructed varus OA were evaluated. Control group consisted of 46 knees of 23 healthy old volunteers and 20 knees of 1 0 young volunteers. Average age of OA, old volunteers and young ones was 67. 0, 65.2 and 26.7 years old respectively.
RESULTS: Average values of the distance of lateral knee movement in the stance phase was 23.3±8.8mm in OA, 17.8±7.2mm in old volunteers and 13.6±5.5mm in young volunteers. Statistically significant difference was found among them.
CONCLUSIONS: Measurement of the distance of lateral knee movement was significantly larger in the severely destructed OA patients than in age matched control group. The measurement was also significantly larger in old volunteers than in young ones.
P-3-09-11
DEVELOPMENT OF A METHOD TO ASSESS FUNCTIONAL INSTABILITY OF THE KNEE DURING WALKING
Shuichi Obuchi (Kitasato University, Kanagawa, Japan), Paul D Andrew (Hiroshima University, Hiroshima, Japan), Masaharu Maeda (Kitasato University, Kanagawa, Japan)
A noninvasive kinematic recording technique involving mathematical modeling of the knee joint was employed to determine anteroposterior displacement of the knee during walking. A three-dimensional analysis system with noninvasive skin markers was employed to collect kinematic data of the femur and the tibia. The model included anteroposterior displacement of the femoral condyle with respect to the tibia and angular displacement of the knee. Difference between measured displacement and estimated displacement was defined as anteroposterior displacement of the knee. The purpose of this study is to examine reliability of the model analysis in thirty normal adults.
Within-session reliability in thirty subjects was 0.81 to 0.89 (p<.001). Subjects had an average of 5.5±1.2 mm of maximum anterior displacement of the tibia during stance phase of walking. These results differed neither between left and right knees, nor between men and women (p>.05).
