“…-5 It was first described by Lovett and Morse in 1892 and subsequent work has further characterised the disorder. [1][2][3][4][5][6][7][8][9][10] Despite the efforts of several groups working prospectively, its aetiology remains obscure and no investigation has proved diagnostic.5 [11][12][13][14][15] It is apparent from published work that it is a self limiting disorder of variable severity, and there is little evidence that it results in any long term adverse effects. In the only three long term studies published, a slightly higher likelihood of coxa magna (radiological enlargement of the femoral head) was shown, though the number of cases was small and the significance uncertain.7 8 16 It is agreed that whatever its pathology, the danger when treating irritable hip is that of confusing it with a more serious disorder such as septic arthritis, Perthes' disease, late presenting congenital hip dysplasia, or slipped femoral epiphysis, thus delaying appropriate and timely treatment.…”