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The Journal of Bone & Joint Surgery British Volume
Vol. 80-B, Issue 6 | Pages 954 - 958
1 Nov 1998
Kim Y Ahn JH Kang HS Kim HJ

The extent of necrosis is the main determining factor in the outcome of osteonecrosis of the femoral head and is best measured by MRI.

Using statistical analyses, we have evaluated the accuracy and repeatability of seven different methods of measuring the extent of necrosis, of which three demonstrate good or acceptable accuracy. For the general observer their repeatability is poor; only for experienced observers were they reasonable. We conclude that within an institution or for personal use, the accuracy of some methods is acceptable, and repeatability reasonable. None is appropriate for international use.