Spacer unit for use in a movable joint of a prosthetic or orthopedic system

A prosthetic system comprising:

• a movable joint defining at least one gap;
• and
• at least one spacer unit positionable in the at least one gap, the at least one spacer unit including a resilient element formed of at least one material that is controllably deformable to vary a thickness of the at least one spacer unit to fill the at least one gap, and to reduce a likelihood of the at least one spacer unit interfering with relative movement between first and second components of the movable joint, wherein the at least one material forming the resilient element is configured to compress in a first direction with little or no expansion in a second direction normal to the first directions;
• wherein the at least one gap is axially defined between the first and second components;
• wherein an axle extends through the first and second components and entirely through the spacer unit, such that the first and second components are arranged to rotate about the axle and move relative to one another;
• wherein the spacer unit has an axis along which a central opening is defined, the spacer unit is coaxial to the axle such that the thickness varies along the axis.