A fixation clamp, more particularly for use in an external fixation system for holding bone fragments adjacent to each other with the help of fixation elements, has at least one clamping assembly having at least one reception to accommodate a fixation element along the longitudinal axis of the reception and at least one locking element extending through the clamping assemblies for blocking the position of the clamping assemblies in a defined angular position. Between said locking element and said at least one clamping assembly there is arranged a washer. The clamping assembly comprises a first contact surface which is spherical and convex and in that said washer comprises a second contact surface which is spherical and concave, wherein the first contact surface is in contact with the second contact surface.