A nurse is caring for a client who is 24 hr postoperative following the placement of an external fixator to the left lower leg. Which of the following assessment findings requires immediate intervention by the nurse?

Nursing care after placement of an external fixation device for a lower limb fracture focuses on neurovascular assessment, infection prevention at pin sites, pain control, and maintenance of limb alignment. An external fixator stabilizes bone fragments while allowing access to surrounding soft tissues, but it also places the client at risk for complications such as infection, impaired circulation, and nerve injury. External fixator requires frequent monitoring of distal neurovascular status to detect early signs of compromised perfusion or nerve damage. Any change in sensation or circulation is considered a potential emergency finding. Rationale: A. Muscle spasms in the affected limb are a common postoperative response due to tissue trauma, immobilization, and pain following orthopedic surgery. These spasms can be managed with prescribed analgesics, muscle relaxants, and proper limb positioning. Although uncomfortable, they are not immediately life-threatening and do not indicate acute neurovascular compromise. B. Redness at pin sites may indicate early localized inflammation, which can occur within the first 24 hours after insertion due to tissue irritation. However, it must be monitored closely for progression to infection. Immediate intervention is not required unless accompanied by purulent drainage, fever, or worsening erythema suggesting infection. C. Decreased sensation in the left foot is an urgent finding because it suggests possible neurovascular compromise, such as nerve compression, impaired arterial blood flow, or compartment syndrome. This requires immediate assessment and intervention to prevent permanent nerve damage or tissue ischemia. Prompt evaluation of circulation, movement, and sensation is essential to preserve limb function. D. Clear drainage at pin sites is expected in the early postoperative period and is considered a normal inflammatory response. Serous drainage may occur as the body reacts to the foreign object and healing begins. Ongoing monitoring is still required, but clear drainage alone does not indicate infection or require urgent intervention.