“…68 patients in 34 studies presented during the development or coalescence phase, and hence presented with swelling, joint effusion, erythema, and knee ballottement [ 5 , 6 , 8 , 12 , 13 , 15 – 17 , 19 – 23 , 25 – 29 , 35 – 37 , 39 , 40 , 42 – 46 , 48 , 49 , 52 , 53 , 59 , 62 ]. One patient presented without oedema or erythema upon inspection, and radiographs confirmed that this patient’s CK was already beyond the fragmentation and coalescence stage at diagnosis [ 50 ]. For patients presenting with these features, osteomyelitis, septic arthritis, pseudogout are important differentials, and 13 studies involving 16 patients performed joint aspiration studies to exclude them [ 12 , 13 , 16 , 18 , 23 , 25 , 27 , 39 , 42 , 45 , 49 , 51 , 58 ].…”