The HipNavigator is a CT-less navigation system for hip replacement. Total hip prosthesis consists of several components for which separate navigation may be desirable. Owing to its modular design, the LOCALITE HipNavigator can individually support navigation for replacing hip cup and stem or for femur head resurfacing.

Main Problems in Hip Arthroplasty
Optimal hip cup replacement depends on the correct inclination and anteversion of the implant. The literature provides guidance on the optimal orientation of the hip cup in the acetabulum. Studies show that significant deviation from these guidelines, or a patient's anomalous anatomy, may lead to luxation of the hip.
Correspondingly, antetorsion and varus-valgus of the femur must be adjusted correctly. A particular problem here is to reconstruct the length of the leg.
In femur head resurfacing, notching must be avoided. At the same time, the surgeon aims to achieve load transmission in the largest possible CCD angle – conflicting demands hard to reconcile.
Incidents of malpractice in these areas may make corrective operations necessary; they lead to premature failure of the implant due to abrasion, loosening or luxation. Computer-based navigation support for the surgeon significantly reduces the risk of mal-positioning implants and thus improves the long-term results of hip arthroplasty.

CT-less Navigation Without Preoperative Planning
The data needed in the navigation are acquired intraoperatively by locating anatomical landmarks and by scanning the corticalis, using different, novel methods in the three navigation modules. Thus extra radiation exposure through preoperative CTs or intraoperative radioscopy can be avoided or minimized. Working with the LOCALITE HipNavigator, the surgeon can reduce time-consuming preoperative planning, freeing time for improved patient care.

Navigation for Hip Cup Replacement
In a hip cup arthroplasty without navigation support, to guide the acetabulum reamer and the cup introducer, the surgeon needs to determine exactly how the patient is lying on the operating table. As misjudgments here may lead to incorrectly positioning the implant, the quality of the surgery depends largely on the surgeon's level of expertise.
To use navigation support, the surgeon needs to acquire position data for a few anatomical landmarks. From these data the navigation system determines the optimal inclination and anteversion, taking into account hints from the surgeon about the patient's anatomy. Regardless of the typical variations in the patient's position on the operating table, the navigation system helps the surgeon to guide the reamer and the cup introducer at the angle needed to correctly position the implant.

Navigation for Femur Head Resurfacing
Navigation for femur head resurfacing is based on precise scans of spots or areas of the relevant corticalis. Calculations based on these scan data are presented in a way that allows the surgeon to assess the situation very accurately. A specific navigation scene helps the surgeon to align the implant to the patient's anatomy.

Independent of Makes of Prostheses
The LOCALITE HipNavigator provides an open platform that can be used with any make of hip endoprostheses. Thus the surgeon can select, even mix and match, the best-suited implant for the case at hand, without any restrictions from the navigation system. Hospitals where different makes of prostheses are routinely used need just one navigation system: LOCALITE HipNavigator.