In assessing a traumatic hip injury, which of the following signs would be least likely?

In the context of assessing a traumatic hip injury, the sensation of instability would be least likely to be a prominent sign. This is mainly because instability suggests a significant structural compromise, which is less common in isolated hip injuries. While it can occur, especially in severe fractures or dislocations, the classic presentation of a traumatic hip injury tends to include more direct signs of trauma.

Both inward rotation of the limb and pain in the hip area are typical findings in hip injuries. Patients might also experience significant discomfort and limited range of motion due to surrounding muscle and tissue damage. Crepitus, or the grating sensation felt during movement, is associated with joint injuries, including fractures, and while it can be present, it might not always be a common feature, especially in less severe injuries. However, it does reflect joint involvement when present.

These distinctions highlight why a sensation of instability is the least characteristic among the signs listed, as it typically would not arise unless there is significant joint or structural damage present.