I agree with @evo that it is a cabling, reduction, and possibly bracing affair. A dinner plate wound will start large decay processes.
Depending on sunlight/cardinal direction, the reduction has to include adjacent crown material to make sure the limb doesn't die off from lack of light, or keep overextending.
Depending on sunlight/cardinal direction, the reduction has to include adjacent crown material to make sure the limb doesn't die off from lack of light, or keep overextending.