The best replacement for leg cramp is blood clot.

The best alternatives to leg cramp are rated as following:
★★★★★  blood clot
★★  dvt
★  charlie horse
★  clot
★  charley horse
  deep vein thrombosis

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Speaking about leg cramp, one probably shouldn't forget about lingering pain.

Other search terms related to leg cramp and their ratings are:
★★★★★ lingering pain
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leg cramp
blood clot
dvt