Total Hip Arthroplasty
THAplus – Cup position, leg length & offset
The OrthoPilot® THAplus module provides focused functionality without an additional tracker fixed to the femur: Besides the cup position and orientation also leg length and offset changes are navigated and can be simulated. The results of the implantation can be simulated – before the final components are implanted. After attaching one reference marker to the pelvis prior to the dislocation and resection of the femoral head the initial anatomic situation is recorded by the palpation of defined landmarks.
The result can be checked during stem preparation as well as after stem implantation. With the joint either reduced or dislocated!
Software Elements
Palpation of Landmarks
The camera tracks the position of the transmitter fixed rigidly to the pelvis. By palpation of exact defined landmarks, the individual anatomy of the patient is recorded as basis for all further navigation steps.
Navigation of the Acetabulum
With help of navigated instruments, the hip socket is prepared and the Cup component is implanted. This way the position and alignment of the cup implant, adapted to the individual anatomy of each patient, can be achieved. The reaming depth is displayed in relation to the medial wall and therefore allows a safe reaming and an avoidance of a protrusion.
Navigation of the Hip Stem
The preparation of the femur is also performed by means of navigated instruments. Aim is the control and correction of leg length discrepancies and offset changes in a mm-range.
At the end of the surgery, the result is recorded and all data is available for documentation purposes.