The best replacement for foot drop is foot slap.

The best alternatives to foot drop are rated as following:
★★★★★  foot slap
★★★★  foot drop
★  footdrop

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Speaking about foot drop, one probably shouldn't forget about herniated disc.

Other search terms related to foot drop and their ratings are:
★★★★★ herniated disc
★★★ sciatica
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foot drop
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foot drop