Final answer:
In children older than 18 months, DDH treatment may involve closed reduction with casting, open surgical reduction, or osteotomies followed by immobilization and possibly physical therapy.
Step-by-step explanation:
Treatment of Developmental Dysplasia of the Hip (DDH) in children older than 18 months often requires more invasive interventions than in younger children. The treatment options may include closed reduction with casting, open surgical reduction, or pelvic and femoral osteotomies, depending on the severity of the condition. Postoperative care typically involves a period of immobilization and may require physical therapy to regain strength and mobility.