TheRockwoodclassificationofacromioclavicularinjuriesinadultsisasfollows:

TypeI:Minorsprainoftheacromioclavicularligament,intactjointcapsule,intactcoracoclavicularligament,intactdeltoidandtrapezius

TypeII:Ruptureoftheacromioclavicularligamentandjointcapsule,sprainofthecoracoclavicularligamentbutintactcoracoclavicularinterspace,minimaldetachmentofthedeltoidandtrapezius

TypeIII:Ruptureoftheacromioclavicularligament,jointcapsule,andcoracoclavicularligament;elevatedclavicle(≤%displacement);detachmentofthedeltoidandtrapezius

TypeIV:Ruptureoftheacromioclavicularligament,jointcapsule,andcoracoclavicularligament;posteriorlydisplacedclavicleintothetrapezius;detachmentofthedeltoidandtrapezius

TypeV:Ruptureoftheacromioclavicularligament,jointcapsule,andcoracoclavicularligament;elevatedclavicle(%displacement);detachmentofthedeltoidandtrapezius

TypeVI(rare):Ruptureofacromioclavicularligament,jointcapsule,andcoracoclavicularligament;theclavicleisdisplacedbehindthetendonsofthebicepsandcoracobrachialis

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