Trialling

A trial assembly, comprising:

• a neck trial comprising:
• a body having an exterior surface;
• and
• a neck extending away from the body and along a neck axis, wherein at least one first line is provided on the exterior surface and the or each first line extends in a first direction parallel to an inferior-superior axis of a patient when in use and at least one second line is provided on the exterior surface and the or each second line extends in a second direction parallel to a medial-lateral axis of the patient in use, and wherein:
• 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;
• and
• 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;
• and
• a head trail, wherein the head trial which is releasably attached to the neck trial and has at least one head line, the or each head line extending in a respective plane perpendicular to the neck axis, and wherein the number of head lines is indicative of the length of the trial assembly along the neck axis.

A method of trialing a joint of a patient, comprising:

• assembling a trial joint assembly, the trial joint assembly including a neck trial and a head trial, the trial neck bearing a plurality of lines arranged to indicate an amount of offset in a medial-lateral direction of the patient and an amount of leg-length in an inferior-superior direction of the patient arising from the neck trial;
• reducing a trial joint of the patient including the trial joint assembly;
• assessing the behaviour of the trial joint;
• and
• inspecting the plurality of lines to determine any changes to prosthetic components to be implanted in the patient to reconstruct the joint of the patient.