The test person’s right knee had a meniscal tear three times before the measurement. The last meniscal tear (always on the right knee) happened 2016.
Test person A: male, 25 years of age, 180cm, 89kg
The test person had to squat at a rhythm of 20 beats per minute (BPM). In other words, the participant had to perform one squat within 3 seconds. The measurement is finished till the test person is not able to keep the rhythm for his squats. This was the case after 103 squats. In addition to that, a chair was placed behind the participant as an orientation for the downward movement to squat always at the same height .
I'm trying to find out the differences in muscular activity and muscular fatigue during the same movement of m. rectus femoris / m. vastus lateralis of the test persons postsurgical and uninjured knee (leg). Maybe someone already has experience with these injuries.
I evaluated the measurement data (Matlab, STFT) from the EMG and they look like in the following way.
Vastus lateralis and rectus femoris from the right leg (postsurgical) occured to work in a much higher muscular frequency than the uninjured left leg. I'm not sure why this is the case and which role the meniscal tear takes in.
Just curious if you did any motion analysis or even a FP under each foot? I'd assume some asymmetrical motion/loading compensation would lead to earlier healthy leg fatigue dependent on post-op time.
Thanks Mr White for the answer. Unfortunately, I didn't make any motion analysis or pressure distribution measurements during the EMG. But you're right, a asymmetrical motion should be considered.
The post-op time is about 1.5 years and the test person said, that he is finally able to strain the post-op leg up to 100%.
Hi
There is certainly a difference, but this depends on the type of injury to the knee joint. For example, when the knee cartilage is in the course of training with age, the pain increases but the person who is not injured to see these symptoms.
May I ask, if you have looked at the right /left comparison for the integrated
EMG prior to looking at the frequency changes. It can be really interesting to look a each single quat cycle of the 103 cycles which your patient performed. You will get a clear picture of how the signal changes towards fatigue. But the possible load changes, which are unfortunately not known, will make it more difficult.
With best wishes for your work
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