the movement of the knee joint are very intimately influenced by the movement of other joints of the leg. The functional interpretations of the movements of the knee joint are very important, recognzed as practical problems, and there are a lot
of
difficulties in measuring the movements of the knee joint accurately, especially when there is instability of the knee joint. Many researches have been made to measure the 3-dimensional movements of the knee joint quantively and high speed stereo
photographic method, video camera method, method using the accelerator, electrooptical method and methods using the exoskeletal link system are introduced so far. However, these methods are so complicated and have shortcomings that there is no
way
to
correct the errors. So we performed this research to develop and new electrogoniomoter which is easy to correct the errors and simple in deisgn. The new instrument used in this research is composed of two universal joints and a pin joint between
them,
and 6 electrogoniometers are applied to measure the relative 3-dimensional positions of the moving tibia compared with fixed femur. The results were as follows.
The amount of knee motion on flexion/extension plane were ranged from the minimum of 42.11°to the maximum of 72.12°, and the mean value was 55.02°.The amount of rotation were ranged from 9.98°to 17.21°, mean value was 13.07°.The amount of
knee
motion on adduction/abduction were from 9.74°to 15.91°, mean value was 12.01°.
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