The best replacement for hairline fracture is stress fracture.

The best alternatives to hairline fracture are rated as following:
★★★★★  stress fracture
★★★★  bruise
★★  fracture
★★  sprain wrist
★★  shin splints
★★  sprained ankle
★★  bone bruise
★  sprained wrist

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Speaking about hairline fracture, one probably shouldn't forget about no swelling.

Other search terms related to hairline fracture and their ratings are:
★★★★★ no swelling
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hairline fracture
stress fracture
bruise