OBjEcT Failed solid bony fusion, or pseudarthrosis, is a well-known complication of lumbar arthrodesis. Recent ad-. vances in radiographic technology, biologics, instrumentation, surgical technique, and understanding of the local biology. have all aided in the prevention and treatment of pseudarthrosis.
Definition of duff. 1  1 : a boiled or steamed pudding often containing dried fruit. 2  2 : the partly decayed organic matter on the forest floor. 3  3 : fine coal : slack.
Definition of shield for English Language Learners. : 1  a large piece of metal, wood, etc., carried by someone (such as a soldier or police officer) for protection. : 2  something that defends or protects someone or something. : 3  a police officer's badge.