1. The results of ischio-femoral arthrodesis for tuberculous arthritis of the hip in thirty-five adults and in twenty-nine children are reported. The "blind" technique of Brittain was used in thirteen patients and the open technique in fifty-one.

2. Bony fusion was obtained by the first operation in thirty-three out of the thirty-five adults and in twenty-three out of twenty-nine children. In children strikingly better results were gained from the posterior open technique than from the original "blind"technique of Brittain.

3. There was no evidence that ischio-femoral arthrodesis in children interfered with the growth of the limb.