Hairline fracture
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  crashed into a Dyson sphere. When he re-materialized in 2369, Doctor Beverly Crusher treated it. ()

In 2368, Alexander Rozhenko suffered a hairline fracture of the tibia after being injured in a fire in Biolab 4 on the . ()

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

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. ()

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

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

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. ()

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de: Haarrissfraktur
Medical conditions