Arthrotomy of knee, including one of the following: (a) meniscal surgery; (b) repair of collateral or cruciate ligament; (c) patellectomy; (d) single transfer of ligament or tendon; (e) repair or replacement of chondral or osteochondral surface (excluding prosthetic replacement); other than a service associated with a service to which another item in this Group applies (H) (Anaes.) (Assist.)