A stress fracture or hairline fracture was a fatigue-induced fracture of the bone caused by repeated stress over time.

In 2294, Montgomery Scott received a hairline fracture to his humerus when the USS Jenolan crashed into a Dyson sphere. When he re-materialized in 2369, Doctor Beverly Crusher treated it. (TNG: "Relics")

In 2368, Alexander Rozhenko suffered a hairline fracture of the tibia after being injured in a fire in Biolab 4 on the USS Enterprise-D. (TNG: "New Ground")

In 2371, Kes listed a hairline fracture as one of the possible diagnoses of Walter Baxter's arm injury. (VOY: "Eye of the Needle")

When the Pah-wraith-possessed Keiko O'Brien fell down from the upper level of the Promenade in 2373, she suffered a broken femur and a hairline fracture of the right parietal lobe. (DS9: "The Assignment")

In 2374, Kovin received a hairline fracture to his premaxilla bone when Seven of Nine hit him in an apparently unprovoked assault. (VOY: "Retrospect")

In 2375, Chakotay was dealt a hairline fracture to his septum while boxing on the holodeck. (VOY: "The Fight")

In 2378, Chakotay suffered a hairline fracture to his left leg after beaming to safety when his Class 2 shuttle crashed into a Ledosian energy barrier. (VOY: "Natural Law")

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