Easy way to trim raw chicken thighs
Assuming you are asking how to debone a raw chicken thigh, the process is not very difficult, and becomes easier with practice.

This video from AllRecipes shows it clearly (I watched, but with sound off, so I don't know about the narration).  Its much easier to understand by watching than by reading.

The best knife to use a thin, slightly flexible knife, often called a boning knife.  While less ideal, a paring knife, utility knife, or even a chef's knife will still do the job.


If you have a leg-thigh quarter, bend the leg at the joint to reveal where the joint is, and slice to through to separate the drumstick from the thigh.
Lay your thigh skin-side down on the board.
Slice along each side of the bone, closely, with your knife, being careful not to cut through the skin.  The flexible tip of the knife will help you hug closely to the bone, minimizing any loss of meat.
Slice under the bone, kind of reaching under it, with the point of your knife to separate the bone from the the thigh.