Is it type of a plagiarism? I have a question about plagiarism: are these two sentences plagiarised versions of each other?

In a cited paper, it says:


  This paper describes the design for a novel passive mechanical knee-ankle prosthesis that provides knee flexion during swing to provide additional toe clearance that makes the device safer.


Can I use the sentence like given below? I will use it in state-of-the-art part of introduction where I give examples of studies:


  Knee flexion was provided by the prosthesis at swing motion.
First, it isn't plagiarism if you cite it. Plagiarism means using someone else's work as if it were your own. What you have done is paraphrase something from the paper. This is allowed as long as it is accurate. Your statement seems a bit too definite, however. The paper makes claims and provides some evidence, I suspect, but it is a bit strong to state it as you did - as if the papers claims are correct in every respect. 

Maybe: 

"According to [1], Knee flexion was ..."