A Screening Examination of the Lower Extremities Assesses the Motor Function of the Lumbar and First Sacral Nerve Roots: Hip Adductors, L1–L2; Knee Extension, L3–L4; Knee Flexion, L5–S1; Great Toe Extension, L5; and Great Toe Flexion, S1.

(Reproduced with permission from BensonDR, KeenenTL. Evaluation and treatment of trauma to the vertebral column. Instr Course Lect1990;39:577–589.)