The others have done the physics but my (somewhat similar) experiences suggest to me that what you may be experiencing is usually called a subperiostial haematoma. A haematoma is basically a spectacular bruise. The periostium is the membrane surrounding the bone tissue, so a subperiostial haematoma is a bruise under the periostium.

Yours sounds more spectacular than most but RICE is the trick. If you do it repeatedly (as I did when training and competing in IV Judo many years ago; lots of vigourous ankle blocks that were more like batterings) the shin bone develops a rough feel. This was also a sign of tertiary syphyllis in times past but I've successfully avoided such parasites. And I can report that the roughness of the shin caused by repeated subperiostial haematomas gradually smoothes out again.

All the best.

Cheers, Rowan