hairline fracture

Barely visible break

A hairline fracture is a thin crack in a bone, often caused by repetitive stress rather than sudden impact.

Unlike complete fractures, the bone remains largely intact—the break is so fine it may not appear on initial X-rays.

Common in athletes and runners: The doctor found a hairline fracture in her shin.

Also called a stress fracture.

Opposites
fracture severity

hairline fracturecompound fracture

Bone snaps through skin

open fracture · shattered bone · spiral fracture · greenstick fracture

Family

hair, hairier, hairiest, hairiness, haired, hairline, hairlines, line, liner

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Top 200,000
Profile
Known to kids · Used worldwide · Timeless · Concrete · Negative · Rated G