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- EasyHip - Model E-640 - Cementless Stem
EasyHip - Model E-640 - Cementless Stem
For optimal results the surgery should be planned in advance using the appropriate templates. The templates are enlarged by a factor of 110%. The implant size should be choosen using good quality AP and ML X-rays with adequate contrast. Each X-ray should be large enough to apply the whole template.
Choice of stem size and stem type
The stem size is selected in a way that, in frontal plane, the outline fills as much of the proximal femoral metaphysis as possible. In the sagittal plane it must be ensured that the stem is suited to the anterior bow of the femur.
The stem is fixed proximally and therefore does not need to fit closely in the distal area. The size of prosthesis should be chosen so that the center of rotation is correctly situated in the middle of the head respectively at a level with greater trochanter. Anteversion must be checked in the sagittal plane.
The stem size and the level for resection of the femoral neck should be selected such that the tip of the greater trochanter is level with the center of the head of the prosthesis.
Lateralized stems are available to achieve an anatomical reconstruction, even in case a high offset (+7 mm compared to standard stem) is required. The templates for the EasyHip Cementless Stem show the centers of rotation for different head-neck-lengths (Fig. 1).