For a Kakeya set in R^n whose line-segment midpoints lie in a set A of packing dimension at most s, the Hausdorff dimension is at least n-s, with bush-argument improvements, e.g. max{19/5-3s/5, 4-s} for n=4.
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Hausdorff dimension of restricted Kakeya sets
For a Kakeya set in R^n whose line-segment midpoints lie in a set A of packing dimension at most s, the Hausdorff dimension is at least n-s, with bush-argument improvements, e.g. max{19/5-3s/5, 4-s} for n=4.