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The acutely swollen knee is a common presentation of knee pathology in the emergency department and the primary care setting, whether on board ship, in a Regimental Aid Post, or in a Medical Centre. The swollen knee has both traumatic and atraumatic (systemic) causes, all of which can be accurately diagnosed with an understanding of the underlying injury patterns and patho-anatomy. In Part 2 of this paper we consider the traumatic causes and also suggest a combined approach to managing an acutely swollen knee. The taking of a detailed history combined with thorough clinical examination will establish the diagnosis or at least the narrow differential diagnosis in the majority of cases. The use of specialist examination techniques, diagnostic imaging and arthrocentesis can further assist the clinician in confirming the correct diagnosis and thus prescribing the appropriate treatment. This review will endeavour to give a consensus of opinion and structured guidelines in the diagnosis and initial management of patients presenting with acute or recent onset swelling of the knee.