This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Pediatric orthopedics, Subject name: Orthopaedics
[{'content': 'Bachelors&; cast is used in Which of the following condition ? \nSelect and explain. \nA. Fracture radius, B. Club foot, C. DDH, D. Fracture calceneum', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Bachelor&;s cast is used in DDH( developmental dysplasia of hip) . once the hip is reduced by closed manipulation under general anaesthesia or by open reduction (indicated if closed reduction fails ,which can be due to *presence of fibrofatty tissue in acetabulum *presence of a fold of capsule and acetabular labrum/inveed limbus between femoral head and superior pa of acetabulum. In this case hip is exposed ,soft tissues obstructing the head is excised or released,& head is repositioned in the acetabulum.) After reduction head is maintained inside the acetabulum by * plaster cast-Bachelor&;s cast or frog leg/ Lorenz cast *splint - von Rosen&;s splint ; external splints can be removed once the acetabulum develops to a round shape.& kept under observation for a period of 2-3yr for any recurrence. REF:Essential ohopaedics, Maheshwari,9th edition', 'role': 'assistant'}]