**11. Procedure- specific RA**

Sometimes standard regional blocks fail in providing expected analgesia. Block failure may be due to the sparing of some of the innervations of pain-generating structures involved in the surgery. For this reason, understanding surgical steps,

innervations of pain-generating structures, and customizing standard RA techniques to make them suitable for the surgery is essential. The standard procedures performed in the knee joint include joint replacement surgery and arthroscopic surgery.
