16th August 2023

A 65-year-old man presents with low back pain that radiates along the anteromedial aspect of his thigh down to his knee

A 65-year-old man presents with low back pain that radiates along the anteromedial aspect of his thigh down to his knee. He reports a history of progressive difficulty in walking. On examination, you find weakness in knee extension.

Which nerve root is most likely affected?