This study is to analyse risk factors for wound complications or surgical site infections and to analyse whether risk factors for wound complications or surgical site infections are also factors for other complications. Based on the data from this study it will be investigated whether a risk score can be build up to predict individual risk for a complication after surgery.

Inclusion Criteria:

• Patients ≥ 50 years with ankle fractures surgically treated at the University Hospital Basel
• Sufficient Follow up at the University Hospital Basel in order to judge wound healing complications over a 4 weeks period and fracture related infection over a 3 months period

Exclusion Criteria:

• Existence of a documented dissent.
• Distal tibia fractures and Pilon fractures
• Followed up at another institution or with no follow up at our institution for any other reason

Patients with ankle fractures surgically treated at the University Hospital Basel starting with the patients operated in 2017 and then going backwards in time, until 120 patients with a surgical site infection or a wound complication are found. Then randomly collection of 120 controls among the remaining investigated patients .