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Thanks for requesting me. The acetabulum is the hip socket. Os acetabuli are unfused secondary ossification centers of bone. In other words, they are "bits" of bone that form where they shouldn't. Ossification is the process by which cartilage is turned into bone. Bilateral just means both sides. It can lead to osteoarthritis.
This sometimes happens when the hips aren't normal, i.e. when the femur doesn't fit into the socket properly. It can be congenital. It can also happen from stress overload. You may be more familiar with the imprecise term "stress fracture" although it isn't really a fracture. This is most likely how it came to be in your case.
Typical non-surgical treatment is rest of the hips and regular non-steroidal anti-inflammatory medication such as naprosyn, ibuprofen, diclofenac, etc. Arthroscopic surgery can remove the ossicle.
Please let me know if you have more questions about this.