Final answer:
The priority nursing intervention would be to manage the patient's pain with appropriate analgesia and support, monitor for complications, and ensure thorough documentation.
Step-by-step explanation:
The priority nursing intervention for a patient reporting a pain level of 7 on a 0 to 10 scale and who is unable to walk with crutches due to leg discomfort following a leg fracture would be to manage the patient’s pain effectively. Proper analgesia should be administered, following the healthcare provider's prescription, to alleviate the pain and allow the patient to participate in necessary rehabilitation activities such as walking with crutches. Additionally, the nurse should ensure that the patient's leg is appropriately supported, monitor for any signs of complications such as infection, and report any changes in the patient's condition to the healthcare team. Documentation of the pain score and the interventions taken is crucial for ongoing management and assessment of the patient’s recovery.