Modular trial implant system

A modular trial implant system comprising at least one first trial implant part, which is configured to releasably connect to at least one second trial implant part and/or an implant part to form at least one first trial joint implant part, wherein the at least one first trial implant part comprises a cone receptacle for accommodating a connecting cone of the at least one second trial implant part or the at least one implant part, wherein the cone receptacle defines an implant longitudinal axis, wherein the at least one first trial implant part comprises at least two first latching elements associated with one another and at least two second latching elements associated with one another, wherein the at least two first latching elements and the at least two second latching elements are arranged or formed axially offset in the cone receptacle relative to the implant longitudinal axis for latchingly engaging behind differently long connecting cones of second trial implant parts or implant parts, wherein the at least one first trial implant part comprises a receiving sleeve defining the cone receptacle, wherein the receiving sleeve comprises a sleeve wall that surrounds the implant longitudinal axis and delimits the cone receptacle, and wherein the sleeve wall is of indentation-free and/or perforation-free configuration at least in a first region between the at least two first latching elements and at least in a second region between the at least two second latching elements.