"Failed conservative care": always define what treatment was received.
Mooney
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V
D006801:Humans; D026201:Musculoskeletal Manipulations / Q000145:classification*; D010506:Periodicals as Topic / Q000592:standards*; D011643:Publishing / Q000592:standards*; D013122:Spinal Diseases / Q000628:therapy*; D009626:Terminology as Topic; D017211:Treatment Failure