Fig. 2

Intraoperative leg length measurement. The thigh plate (a) was positioned laterally on the distal thigh (not shown) and secured with an incision foil, not fixed to the femoral bone. After inserting the femoral implants and hip reduction, the limb was repositioned in the initial neutral reference position by the laser projection aligned with the marking on the vertical target (b), and the femur screw (c) was re-registered using the registration probe (d)