This prospective study (including patients with an intertrochanteric or subtrochanteric fractures type 31A1, 31A2 and 31A3) is to assess the effect of an educational intervention for operating surgeons with respect to an improvement of the quality of reduction and internal stabilisation of intertrochanteric fractures. A historic cohort of patients operated at the University Hospital Basel for an intertrochanteric fracture from 2014-2015 will be used for comparison.

Intertrochanteric fractures are one of the most frequent fracture type in the elderly population usually occurring in patients older than 60 years of age. Almost all fractures are treated operatively with reduction and stabilisation of the fracture using either a dynamic hip screw or an intramedullary nail. The reduction of the fracture and positioning of the implant are surgeon dependent factors and can be influenced by educational interventions. The investigators hypothesized that a structured educational program on the optimal use of intraoperative fluoroscopy to control the quality of reduction and the position of the implant, as well as the provision of a practical algorithm intraoperatively guiding reduction and stabilisation of intertrochanteric fractures would improve the radiologic outcome.

Inclusion Criteria:

• Patients presenting with an intertrochanteric fracture type 31A1 or 31A2 or subtrochanteric fracture type 31A3
• Surgeon must have completed the teaching video on how to evaluate intraoperatively the fracture, the reduction and the implant positioning and complete the reduction algorithm documenting that all intraoperative steps have been correctly accomplished

Exclusion Criteria:

• Patients operated without adherence to the reduction algorithm
• Patients operated by surgeons who did not attend the teaching session

Patients presenting with an intertrochanteric fracture or subtrochanteric fracture at the Department of Orthopaedic and Traumatology, University Hospital Basel