Ahmed Khalifa - ۱ Orthopaedic Department, Qena University Hospital, Qena, Egypt ۲ Orthopaedic Department, Assiut University Hospital, Assiut, Egypt
Hatem Bakr - Orthopaedic Department, Assiut University Hospital, Assiut, Egypt
Elsayed Said - Orthopaedic Department, Qena University Hospital, Qena, Egypt
Mohammad Mahran - Orthopaedic Department, Assiut University Hospital, Assiut, Egypt

Acetabular cup optimum position is paramount for total hip arthroplasty (THA) good outcomes. Although controversial,Lewinnek proposed safe zone for cup placement still the most widely accepted target. Cup placement can be improvedusing specific anatomical landmarks, computer navigation system and handheld navigation devices. As using asmartphone on daily bases became popular among orthopedic surgeons, in this technical note, we describe how to usesmartphone specific applications intraoperatively during total hip arthroplasty to adjust cup inclination angle, which webelieve to be easy, cheap and beneficial for young less experienced surgeons.Level of evidence: IV

cup, inclination, Smartphone, THA