A 65-year-old patient, Mrs. Smith, presents to the emergency department with complaints of severe pain in her lower back. She reports that the pain started suddenly while she was lifting a heavy box at home. Mrs. Smith describes the pain as sharp and stabbing, radiating down her left leg. She rates the pain as 8 out of 10 on the pain scale. Upon further assessment, Mrs. Smith reports a history of intermittent lower back pain for the past few years, which usually resolves with rest and over-the- counter pain medications. Based on Mrs. Smith's presentation, which of the following findings would support a diagnosis of acute pain rather than chronic pain?