\documentclass{standalone}
\usepackage{tikz}
\usepackage{pgfplots}

\begin{document}
\begin{tikzpicture}
  \pgfplotstableread[col sep=comma]{displacement_POI.csv}\loadedtable;
  \begin{axis}[
    width = 10cm,
    height = 6cm,
    xlabel={Time [s]},
    ylabel={X-displacement [mm]},
%    yticklabel style={
%            /pgf/number format/fixed,
%            /pgf/number format/precision=2
%    },
%    axis x line* = bottom,
%    axis y line* = left,
    xmin = 0,
    xmax = 3,
    ymin = -75,
    ymax = +75,
    ymajorgrids=true,
    ytick distance=25,
%    clip=false,
    legend style={at={(0.84,+0.175)},anchor=north,font=\footnotesize}
  ]
  \addplot[red, very thick] table [x={Time [s]}, y={X-displacement [mm]}] {\loadedtable};
  \addlegendentry{$\mathbf{u}^{\textnormal{insertion}}_{x}$};
  \end{axis}
\end{tikzpicture}
\end{document}