Hello , My father is 40 years old and went through a terrible accident in 2003 because of which his left leg was braked at several places including his hip section. 15 years later, in begining of 2018 , a bit of pus started coming out of his hip's section where the IM injection is made. Due to very less quantity he did not take it into concern. In march 2020, he went to doctor and found that it was elsewhere managed case of infective arthritis of left hip chronic osteomyelitis. The doctor excised arthroplasty of femoral head and applied antibiotic spaces and did sequestectomy of left femur shoft and debedement of dead bone and tissues. Gave antibiotic and discharged aftet some days. After stitch removal , some days later , the whole place filled and swelled. When pressed , a lot of pus came out. Doctor changed the antibiotic but it caused digestive and energy problems so doctors said to stop it. The pus still comes when dressing is being done. Why it is so? And what type of precautions and medications should be given for this? Because the doctor said he could not figure out why it was so.