The present invention relates to a partial joint replacement (1000), encompassing a shell-like segment (100) with a concave inner contour (3) for the arrangement on at the bone structure of a patient, wherein the segment (100) comprises a lateral section (5) and a medial section (7) along a longitudinal direction (x), and wherein the outer contour (1) of the segment (100) comprise in longitudinal direction (x) at least one inflection point (9).
