As posted by ‘Dan’ in a similar thread, there is a possible fix if you’re not using a sprite:
How do I make background-size work in IE?
filter: progid:DXImageTransform.Microsoft.AlphaImageLoader(
src="https://stackoverflow.com/questions/4885145/images/logo.gif",
sizingMethod='scale');
-ms-filter: "progid:DXImageTransform.Microsoft.AlphaImageLoader(
src="https://stackoverflow.com/questions/4885145/images/logo.gif",
sizingMethod='scale')";
However, this scales the entire image to fit in the allocated area. So
if your using a sprite, this may cause issues.
Caution
The filter has a flaw, any links inside the allocated area are no longer clickable.