So I was between L4 and S1 radiculopathies on this one and couldn't remember the sensory/motor/reflex losses that differentiated the two. Here's a summary (including L5 for completeness)

L4 Radiculopathy:

• sensory loss: distal lateral thigh over patella to medial calf
• motor loss: knee extension, tibialis anterior (foot dorsiflexion) → difficulty heel walking
• reflex loss: patellar reflex

L5 Radiculopathy:

• sensory loss: Dorsolateral thigh, lateral side of the knee, anterolateral lower leg, dorsum of foot, big toe
• motor loss: Extensor hallucis longus muscle (first toe dorsiflexion) → difficulty heel walking (foot drop)

S1 Radiculopathy:

• sensory loss: Lateral foot
• motor loss: Peroneus longus and brevis muscle (foot eversion) and gastrocnemius muscle (foot plantarflexion) → difficulty toe walking
• reflex loss: Achilles

https://next.amboss.com/us/article/ji0_rf#Z4e6b97d11a53a281e346032ace785757

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