We use Femoral Nerve Blocks on many of our TKR's. They work really well for anterior knee and thigh pain . They don't help Posterior knee pain so the docs usually also order a PCA . Anesthesia is responsible for removing them and they also check the patient each day while it is in. We use continuous pumps. The nurse needs to check sensation to the leg for numbness. While some is expected it should not be excessive. The patients must have assistance OOB , which they need anyway.