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Foot drop. Foot drop is a gait abnormality in which the dropping of the forefoot happens due to weakness, irritation or damage to the common fibular nerve including the sciatic nerve, or paralysis of the muscles in the anterior portion of the lower leg. It is usually a symptom of a greater problem, not a disease in itself. Foot drop is characterized by inability or impaired ability to raise the toes or raise the foot from the ankle. Foot drop may be temporary or permanent, depending on the extent of muscle
Because the tibialis anterior muscle is innervated from the L4-S1 roots, especially the L5 and to a lesser extent L4 root, through the sciatic and ultimately the deep peroneal nerves, a lesion in any of these can cause foot drop. The toe extensors are primarily innervated from L5, with some contribution from S1.efinitions: When there is paralysis of the dorsal extensor muscles of the foot and the toes (tibialis anterior, extensor digitorum longus, and extensor hallucis longus), which are innervated by the deep peroneal nerve, foot drop occurs.