While it's possible to have unique and unusual phobias, I'm not aware of a specific phobia related to one's own ribs. Phobias are intense, irrational fears of specific objects, situations, or concepts. While there are phobias related to body parts or medical procedures, like tomophobia (fear of surgery) or ommetaphobia (fear of eyes), there doesn't seem to be a widely recognized phobia specifically related to one's own ribs.
That being said, people can have different levels of discomfort or anxiety about certain body parts or medical conditions. It's not uncommon for people to feel uneasy about medical procedures or the idea of having certain health issues. The fear you described when researching Slipping Rib Syndrome and the Hooking Maneuver could be related to medical anxiety or health-related concerns rather than a traditional phobia.
If you find that your fear or discomfort is significantly affecting your daily life or causing you distress, it's essential to consider seeking support from a mental health professional. They can help you explore your fears, cope with anxiety, and develop strategies to manage your feelings surrounding health-related topics.