Revision of endoprosthetic replacement, if item 50218 or 50224, or an item that describes a service substantially similar to either of those items, applied to the initial procedure: (a) including any of the following: (i) rebushing; (ii) patella resurfacing; (iii) polyethylene exchange or similar; and (b) excluding removal of prosthetic from bone (H) (Anaes.) (Assist.)