Final answer:
The treatment for a hip joint injury is to administer pain medication and immobilize the hip joint.
Step-by-step explanation:
The treatment for a trauma victim who has sustained a hip joint injury is to administer pain medication and immobilize the hip joint. Hip injuries can range from fractures to dislocations, and immobilization helps prevent further damage and minimize pain. Pain medication can help manage the immediate discomfort. It is important to consult a healthcare professional for a proper diagnosis and treatment plan.