What could intense, shooting pain down the front of the right leg mean?

RLE shooting pain: Lumbar radiculopathy, diabetic amyotrophy, compartment syndrome, and less likely vascular (ischemia or claudication) and nerve entrapment or compression are all considerations without knowing more. At 80-years young, risk for a more serious underlying factor is higher. Also, things tend to present differently in the geriatric population. If new problem, er visit is suggested.