P-3-09-12
THE BIOMECHANICAL CHANGES IN UNILATERAL KNEE IMMOBILIZATION IN 15｡?FLEXION AND SERIAL LIMB LENGTH ADJUSTMENT
Yeo-Sam Yoon, Bong-Ok Kim (Chungnam National University, Taejon, Korea)
To understand the therapeutic effectiveness of limb length adjustment with shoe elevation in patients who need immobilization of the unilateral knee joint biomechanical evaluation was done in 14 healthy young men.
Each subject was evaluated by ELITE 3-dimensional motion analysis system before and after immobilization of the right knee joint at 15｡?and with serial shoe elevation from 5 to 40ram with 5mm increment.
With immobilization cadence and mean velocity decreased, right double support time, stance time, swing time and left stance time, swing time increased, right swing phase hip maximal flexion angle, stance phase ankle maximal power generation, left swing phase knee maximal flexion angle, and stance phase ankle maximal power generation decreased. When outsole of the right shoe was serially elevated, left ankle maximal power generation decreased by 10-15mm.
Unilateral knee flexion immobilization resulted in biomechanical changes of bilateral hip, knee and ankle joints and outsole elevation of 10-15mm the immobilized leg was effective to decrease the induced changes.
P-3-09-13
Analysis of Gait with Above-knee Prosthesis Using a New Gait Analysis System
-Body's center of gravity and computer graphics-
S. Irie, H. Iida, H. Kanzaki, I. Kawano, K. Mukai, C. Hayashi, T. Nakamura
(Kyoto University Hospital, Kyoto, Japan)
PURPOSE: Changes in the human body's center of gravity while walking with above-knee prosthesis were examined, using a new gait analysis system. This system can be synchronized with computer graphics (CG) which allow graphical representation and observation from any selected viewpoint.
METOHODS: Three individuals with above-knee prosthesis were enrolled in this study, including an individual in the early stages of training, an individual in the middle stages of training, and an individual experienced with the prosthesis. The body's center of gravity (COG) was analyzed in each of these individuals while they walked, using the above system, and was compared with the data from 3 healthy controls. In addition, the analysis using this system was synchronized with the CG for the purpose of visual analysis.
RESULTS: During prosthetic walking, the lateral component (Dx) and the vertical component (Dz)of three-dimensional displacement widths of the COG averaged 4.9±0.8 and 3.7±0.6cm, respectively. In healthy individuals, Dx and Dz averaged 2.9±0.6 and 3.2±0.6cm, respectively. Synchronization with CG, which allows observations from any viewpoint, simplified detection of problems in the use of artificial limbs.
CONCLISION: The mean magnitude of dislocation of the COG was greater during prosthetic walking than during the walking of healthy individuals, as we had expected. However, this parameter for experienced artificial limb users was very close to that of healthy individuals. Synchronization of this analysis system with CG was found to allow simple identification of problems even by inexperienced examiners.
