A 70-year-old man complains of aching lower back pain that radiates to his buttocks and upper thighs

A 70-year-old man complains of aching lower back pain that radiates to his buttocks and upper thighs over the past few months. He does not recall any trauma and has no past medical history except for allergic rhinitis. He notes that the pain worsens with walking, especially downhill, and gets better with sitting or leaning forward. On physical examination, bilateral straight-leg raise test is negative and his deep tendon reflexes are normal in his lower extremities. He has slight proximal thigh weakness with flexion at the hip but his upper extremity strength is 5/5 in all muscle groups bilaterally. His dorsalis pedis and posterior tibial pulses are 2+ in both legs. What is the most likely diagnosis? a. Sciatica b. Lumbar disk herniation c. Claudication d. Polymyalgia rheumatica e. Lumbar spinal stenosis

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