The findings in this case are typical of mild osteogenesis imperfecta (type 1). 

The triradiate deformity of the pelvis (not to be confused with the triradiate cartilage in the pediatric pelvis) is a common finding in OI, but may also be see in other conditions such as Paget disase of bone, osteomalacia, rickets, inflammatory arthritidities (eg RA), or a number of other conditions that may have bilateral protrusio acetabuli.