A trial implant system and method of trialling are described. The trial implant system comprises a stem component (120) having a neck (122) including a free end (124) and a neck longitudinal axis (123). A first trial head (100) has an articulating surface (102) and includes a bore (108) having a bore longitudinal axis (106) and which can receive the free end of the neck with the neck longitudinal axis and bore longitudinal axis coincident. The system includes a first formation (126) and a plurality of second formations (128) angularly disposed around the longitudinal axis. One of the first formation and the plurality of second formations is provided on the neck and the other is provided within the bore. Each of the second formations can matingly engage with the first formation to limit the depth of insertion of the neck into the bore by a different amount.
