"Hospital ward admission for a broken hip"

My dad fell and broke his hip.  He had surgery, a pin put in to his hip.  He is type 2 diabetic.  He developed a pressure sore on his left heel within the first week of being on surgical ward.  The heel turned black.  He was in hospital for 10 wks. He also got an infection on the wound from surgery, but that cleared.  

He is home now, he has to attend podiatry weekly for his black heel.  They said it might not ever heal.  They stated that amputation may be one of the options if antibiotics don't help.  

I'm not very happy that it has come to this.  I feel that the level of care in the surgical ward was not up to standard in preventing pressure sores.  He came out of hospital worse than when he went in.