Abstract: A neck trial (170) is disclosed. The neck trial has a body (182) and a neck (186). The body has an exterior surface. The neck extends away from the body along a neck axis (190). At least one first line (194) is provided on the exterior surface, which extends in a first direction parallel to an inferior-superior axis of a patient when in use. At least one second line (196) is provided on the exterior surface, which extends in a second direction parallel to a medial-lateral axis of the patient in use. The number of first lines, or the position of the first line or lines relative to the second line or lines, is indicative of an amount of offset in the medial-lateral direction caused by the neck trial. The number of second lines, or the position of the second line or lines relative to the first line or lines, is indicative of an amount of leg-length in the inferior-superior direction caused by the neck trial. A kit of parts, a trial assembly and a method of trialling a joint of a patient are also disclosed.