A Study to Verify if the Surgery for the Proximal Femur Fracture Can be Improved With the Help of a Navigation System

Inclusion Criteria: * Patients undergoing unilateral primary intramedullary nailing at the Ospedale Regionale di Lugano. * Patients aged 50-85 years old. * Patients with a BMI \>18 and \<35. * Patients able to provide informed consent and follow all the study procedures as indicated by the protocol. * Radiological evidence of proximal fracture of the femur, AO classified as 31 A1.3, 31 A2.1, 31 A2.2, 31 A2.3, 31 A3.1, 31 A3.2, 31 A3.3. Exclusion Criteria: * Other clinically significant concomitant disease states (e.g. renal failure, major hepatic dysfunction, life-threatening cardiovascular disease, etc..). * Known or suspected non-compliance, drug or alcohol abuse. * Inability to follow the procedures of the study, e.g. due to language problems, psychological disorders, dementia, etc. of the participant. * Previous enrolment into the current study. * Enrolment of the investigator, his/her family members, employees and other dependent persons.