Always make sure that the animals have a way to escape. Musk oxen almost always want to flee, but if they feel cornered they might resort to the only option they feel they have left: to charge.
If you see a herd of musk oxen scattered across the terrain, do not pass between the bull and his herd. The bull is not always the biggest animal, but he is the one whose horns cover almost all of his forehead.
Sometimes a musk ox, with its poor eyesight, might think you are in fact a musk ox, as it can only see your silhouette. In this case, it might approach you. If this happens, do not retreat from the musk ox in a straight line. Instead, walk at a 90 degree angle to the line between you and the musk ox. This way, the musk ox will know that the silhouette it sees is not a musk ox, but a person, and will most often flee.
When hiking in areas with many musk oxen, consider whether it is safer to go with a local experienced guide, who is used to being in musk ox territory and knows about the behaviour of the animals and how to read them.