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Table 1 Rockwood classification system for AC joint injuries

From: The acutely injured acromioclavicular joint – which imaging modalities should be used for accurate diagnosis? A systematic review

Rockwood classification Type I Type II Type III Type IV Type V Type VI
AC ligaments sprained disrupted disrupted disrupted disrupted disrupted
CC ligaments intact sprained disrupted disrupted disrupted disrupted
Deltoid and trapezius muscle intact intact detached from clavicle detached from clavicle detached from clavicle detached from clavicle
Dislocation of the clavicle none AC joint widening, CC subluxation AC joint dislocation, CC interspace 25–100% greater than compared to uninjured side CC interspace may appear widened, clavicle horizontal unstable with posterior (sub-) luxation AC joint dislocation, CC interspace more than 100% greater than compared to uninjured side AC joint dislocation, clavicle displaced inferior to the coracoid