A 3-Year-old child came with a history of pain and swelling in right thigh since 1month. He was treated for sepsis and ventilator-associated pneumonia 1.5 months back when he grew staphylococcus in his blood. At present his total counts is 23000, ESR-62, CRP - positive.

Ultrasound examination showed a collection in right hip and knee. X-ray is attached. What would your line of treatment be?