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Through the lessons we have learned over the years, especially in obstetric anesthesia where we have seen (and our unfortunate patients have experienced) the unpleasant consequences of unblocked segments or hemi-block with epidurals, and many other clinical situations, we now realize that blocking 60% of the nerves that innervate a joint does not reduce pain by 60%. In fact, it focuses 100% of the pain into the remaining 40% of the joint, therefore, in actual fact, worsening the pain and suffering of the patient.
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Andre P. Boezaart (The Anatomical Foundations of Regional Anesthesia and Acute Pain Medicine)