Review Question - QID 2199

During a medical mission to Guatemala, a 6-year-old child is brought to clinic for his first orthopaedic evaluation. His mother reports that he required major colorectal surgery shortly after birth and was never able to walk. He in unable to sit unsupported without using his hands to stabilize himself. He is otherwise cognitively normal and has excellent upper extremity strength. Radiographs of his pelvis are are shown in Figures A and B. Which of the following is accurate regarding his condition: