16th August 2023

A 55-year-old man presents with pain radiating down the posterior aspect of his right thigh and leg to the sole of his foot

A 55-year-old man presents with pain radiating down the posterior aspect of his right thigh and leg to the sole of his foot. He also reports a feeling of ‘pins and needles’ in this area. On examination, you notice weakness in plantar flexion of his foot.

Which nerve root is most likely affected?