What is testicular torsion from?

Bad luck!: Torsion is from your anatomy not being sufficient to prevent your testicle from spinning and then having the misfortune of some movement that spins the testicle. Most torsion happens during routine activity like getting into bed. For more: www.Peedoc.Com @thepeedoc.

A dangling testis...: It's a dangling testis like a bell-clapper hinging below inguinal canal from inborn poor fixation of testis supposedly to the scrotal wall so it twists as testicular size increases and cremasteric muscle acts; this is intravaginal and happens to the puberty and adults. Those hinging above external inguinal ring are extravaginal, happening to newborn or before birth. Detail? Ask doc in expertise.