Bicontact® Hip Stem System

The Bicontact® Hip Stem System: The bone-preserving operation technique for cementless or cemented implantation. For primary and revision surgery.
The Bicontact® philosophy is maximum preservation and protection of the existing bone substance. Based on the simple but crucial fact that the success of the prosthesis Fixation depends on both – implant and bone. To do this, instruments were developed that compress the bone instead of removing it. The Bicontact® system comprises various stem types – for different anatomic morphologies. Many surgeons worldwide confirm that Bicontact® is one of the most successful hip endoprostheses they have ever implanted. The modern modular head and cup programm completes the Bicontact® system.

Design cementless
Direct contact with the bone: Titanium and Plasmapore® support the integration in the proximal bone structures. The 0.35 mm microporous pure titanium coating with pores of 50-200 μm diameter and 35 % porosity leads to direct bone apposition. This is confirmed by clinical experience with Plasmapore®.

Design cemented
The cemented Bicontact® stems are made of a cobalt-based alloy with a smooth prosthesis surface. The Bicontact® supports the formation of a complete cement mantle. The distal PMMA centraliser and the bilateral flanges guide the stem into the intramedullary canal.

Stem types
For normal medullary canal conditions, the Bicontact® stem design offers the standard stem type S or type H (high of set). For other conditions the Bicontact® SD stems are the suitable choice. For exceptional cases such as extremely severe dysplastic changes with very narrow conditions in the femoral canal, the unique range of Bicontact® N stems can be choosen.
The characteristic bilateral Bicontact® flanges ensure secure proximal anchoring of all stem variants. The design solutions differ mainly in the upper medial section, which is responsible for anchoring the prosthesis. For all stem types, the distal stem is tapered into a flat, tapered end.

Instruments
The A-Osteoprofiler compress the metaphysal bone, define the axial stem position and antetorsion and thus obtain a figure for the distal dimension of the medullary canal. With the B-Osteoprofilers the bone will be prepared at the site where the prosthesis will be fixed. For this reason, the proximal part of the B-Osteoprofiler shows the Bicontact® design. Due to the proximal anchoring concept, the B-Osteoprofiler determines the dimension of the implant. Therefore, a Bicontact® stem does not fix distally but proximally. The Bicontact® can be implanted with the Osteoprofilers in a minimally invasive procedure. As a muscle sparing measure, the trochanteric wing is only prepared in a last step.

Revision stem
The revision of a hip prosthesis requires a particularly careful procedure. The revision should preserve as much substance as possible and support the reconstruction of the bone. For a revision the implant requires bone substance, for stable fixation. Therefore, the principle of Bicontact® revision is: bridging the defect zones. With secure locking with screws, if necessary. And, of course, with the proximal Bicontact® design with different stem lengths, straight, curved or SD type for narrow bone conditions.