A 65-year-old man with osteoarthritis complains of back pain, worse on walking, along with aching and heaviness in both legs that forces him to stop walking. Pain is relieved slowly after rest or leaning forward. The most probable diagnosis is:
**Core Concept**
The patient's symptoms of back pain, aching, and heaviness in the legs, relieved by rest or leaning forward, are characteristic of neurogenic claudication due to lumbar spinal stenosis. This condition involves compression of the cauda equina, a collection of nerve roots in the lower spine, leading to radiculopathy and symptoms of neurogenic claudication.
**Why the Correct Answer is Right**
The patient's symptoms are caused by mechanical compression of the cauda equina, which is exacerbated by walking and relieved by leaning forward or resting. Leaning forward increases the diameter of the intervertebral foramen, thereby reducing compression on the nerve roots. This condition is often seen in older adults with degenerative changes in the spine, such as osteoarthritis.
**Why Each Wrong Option is Incorrect**
**Option A:** This option might refer to spinal stenosis due to a herniated disc, which is less likely given the patient's age and symptoms. In younger patients, disc herniation is a more common cause of spinal stenosis.
**Option B:** Muscle strain or overuse injury is unlikely to cause persistent and severe symptoms that are relieved by leaning forward.
**Option C:** This option might refer to vascular claudication due to peripheral artery disease, which typically presents with calf pain or cramping during exercise, but is relieved by rest, not leaning forward.
**Clinical Pearl / High-Yield Fact**
Neurogenic claudication due to lumbar spinal stenosis often presents with a "cape-like" distribution of pain and weakness, which can be relieved by leaning forward or sitting.
**Correct Answer:** C.