A case of Left AC joint Disruption has been described.Fractures around AC joint occurs due to both Direct and indirect trauma.Direct trauma by impact on lateral part of the shoulder with arm in adducted position.A 45 year old male had RTA and sustained injury to his left shoulder.X ray was taken and patient was diagnosed to have left sided post traumatic AC joint disruption with ROCKWOOD classification Type 3 with no neurovascular deficit.Patient underwent osteosynthesis and post operative course was uneventful.The patient had no complaints following surgery.