Injury advice/help

spasypaddy
spasypaddy Posts: 5,180
Ive done something to the back of my right knee on the outside
back-of-knee08.jpgp
where the label Bicep Femoris is aimed at.

It is incredibly painful to bend and movement in many forms is very painful. So cant ride, cant walk, cant really do much. Any advice? Any ideas what it could be?