A nurse is caring for a client who sustained a posterior hip dislocation following a motor vehicle accident. Which nursing intervention should be the priority?

Immobilizing the affected extremity prevents further injury and neurovascular compromise in posterior hip dislocation. Other options are secondary: ice reduces swelling but isn't the priority, early ambulation is contraindicated, and supine positioning may not be optimal.

Understanding Posterior Hip Dislocation
A posterior hip dislocation occurs when the femoral head is forced out of the acetabulum backward, often due to high-energy trauma such as a motor vehicle accident. The affected leg typically presents in a shortened, adducted, and internally rotated position. The immediate priority is to prevent further injury to the surrounding neurovascular structures, particularly the sciatic nerve, and to maintain the joint's alignment until definitive reduction can be performed.

Analyzing the Priority Intervention
The primary goal in the initial management of a joint dislocation is immobilization to prevent damage to the joint capsule, blood vessels, and nerves. Movement of the dislocated hip can cause a fragment of the posterior acetabular wall to displace further, as posterior wall fractures are a common associated injury in this mechanism ^[2]. Therefore, the priority nursing action is to stabilize the limb in its presenting position of comfort, which is typically the path of least tension on the surrounding soft tissues.

Evaluating the Options
- Option 1: Apply ice packs. While ice is a valuable intervention for pain and edema, it does not address the immediate risk of neurovascular compromise or further musculoskeletal injury caused by an unstable joint. It is an important comfort measure but is not the priority.
- Option 2: Encourage early ambulation. This is contraindicated before the hip joint is reduced and stabilized. Weight-bearing or movement on a dislocated joint will exacerbate soft tissue injury, increase the risk of sciatic nerve palsy, and may convert a simple dislocation into a complex one with an associated fracture.
- Option 3: Position supine with legs extended. For a posterior hip dislocation, the client will not be able to extend the leg due to muscle spasm and the mechanical block of the femoral head behind the acetabulum. Forcing the leg into extension would cause severe pain and potential iatrogenic injury, a risk highlighted by the significant force sometimes required even in controlled reduction techniques ^[1].
- Option 4: Maintain position of comfort and immobilize. This is the correct priority. By supporting the limb in its naturally assumed, deformed position, the nurse minimizes movement at the fracture or dislocation site. This action directly protects the neurovascular bundle and prevents the development of complications such as post-traumatic osteoarthritis, which is strongly linked to the severity of the initial articular injury and the presence of intra-articular fragments ^[2]. Immobilization is the critical first step before diagnostic imaging and definitive closed or open reduction, which may require adequate sedation and muscle relaxation to be performed safely ^[1].