[Nerve block analgesia after surgery of the knee].

Lumbar plexus block via the inguinal approach is indicated for analgesia following knee surgery. The technique consists in an injection of the anaesthetic solution through a catheter placed into the space limited by the fascia of the iliopsoas muscle. In this area are the different nervous roots which constitute the plexus. A good technique and a good knowledge of the anatomy of this region are necessary for a successful block and for the safety of the patient.