Final answer:
The sentence should be completed with 'order', as in 'Never release traction UNLESS you have an order from the MD to do so', which is an essential rule in medical practice to ensure patient safety and proper management of orthopedic conditions.
Step-by-step explanation:
The student's question is in the context of medical procedures, specifically pertaining to traction used for treatment in orthopedic cases. The correct completion for the sentence 'Never release traction UNLESS you have an order from the MD to do so' is fundamental in medical practice to ensure patient safety and proper healing. Traction is the application of a pulling force to an injured part or extremity, and it is critical to follow a physician's instructions meticulously. An order from a medical doctor (MD) is a documented directive given by the physician to guide the clinical management and treatment of a patient. Without such authorization, there could be serious consequences for patient health including disrupted healing or further injury.