The best replacement for guarding is rigidity.

The best alternatives to guarding are rated as following:
★★★★★  rigidity
★★★★  rebound
★★★★  rebound tenderness
★★★  muscle spasm
★★  tenderness
  cctv
  voluntary

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Speaking about guarding, one probably shouldn't forget about rebound.

Other search terms related to guarding and their ratings are:
★★★★★ rebound
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Google Trends

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guarding
rigidity
rebound