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Non-fusion of ossification centres. Symptomatic patella bipartita. a, b Axial grey scale (a) and colour Doppler b sonograms with c, d sunrise (c) and A–P (d) standard radiographs. In a obtained at the anterior aspect of the patella (Pat), note the break (arrowhead) of the bone cortex related to synchondrosis between the patella and the unfused bone centre (UBC). b Local hyperaemia due to instability of the UBC. c, d Standard radiographs confirms US appearance
