No one has really answered the question which came first: the broken bone or the fall?
Older adults with brittle or osteoporotic bones are at increased risk for hip fractures. In theory, the forces applied to the bones during a hip joint replacement could cause a fracture. If a patient has extremely weak bones, he or she usually isn't a good candidate for a joint replacement.
minimally invasive total hip replacement means the opening or incision is very small (about 2 to 2 1/2 inches long). The surgeon can't really see inside the joint using this method. X-rays are taken to see the placement of the implant. The X-rays also show the condition of the bone. A fracture would have been noticed at the time of the operation.
You may want to ask the physician to review the X-rays with you to satisfy your concerns about this point.