How to Replace Oak Flooring
Replacing damaged oak flooring planks without ripping out the entire floor is a complicated project but one you can accomplish with the right process and a little patience. Oak flooring is installed with a tongue-and-groove system, which means you can't pull any of the boards straight up without ripping off the tongue-and-groove milling on the adjacent boards. Cutting out the middle of the damaged board allows you to separate the tongue-and-groove connections sideways. You'll also have to alter the milling on the replacement board to get it in.
Read the full article on How to Replace Oak Flooring