Infection
Risk factors
Patient
Advanced age
Immunosuppression - steroids / Rheumatoid / DM
Malnutrition - Lymphocyte count / Transferrin / Albumin
Vascular disease
Obesity
Poor skin i.e. psoriasis
Previous infection in joint
Infection elsewhere - i.e. UTi
Prolonged hospital admission
Revision surgery
Operative Factors
Preoperative