Revision of uni-compartmental arthroplasty of the knee, with femoral or tibial components (or both) with uni-compartmental implants, other than a service associated with a service to which: (a) item 48245, 48248, 48251, 48254 or 48257 applies; or (b) another item in this Group applies if the service described in the other item is for the purpose of performing surgery on a knee (H) (Anaes.) (Assist.)