Acetabular Implant Materials & Coating

Shells are titanium alloy treated with a unique dual layer of titanium particles: an inner layer of spherical beads is covered with irregular shaped beads which are then sintered together to form a coating that is both hihgly porous (58%) and exceptionally rough.

SEM Image at 50x magnification

APEX Interface™ Acetabular Cup Design

APEX INTERFACE™ Cups and liners feature proporional rim flare for peripheral loading and increased initial implant-to-bone stability.

Implant Screw Hole Options

Cups are available with and without screw holes, depending on bone strength and surgeon preference.

Interface™ Acetabular Cup Liners

The INTERFACE Acetabular Cup system employs a locking design that delivers excellent liner retention with unsurpassed congruency. Improved surface contact between liner and shell results in fewer gaps, significantly reducing potential for poly debris generation. The locking mechanism allows infinitely variable orientation of hooded liners.

ApeX-LNK™ Highly Cross-linked Polyethylene

INTERFACE Liners are available in Standard Ultra High Molecular Weight Polyethylene (UHMWPE) as well as ApeX-LNK™ Highly Cross-linked (UHMWPE), that has been sterilized without irradiation to assure maximum resistance to oxidation.

Highly crosslinked polyethylene is rapidly becoming the gold standard material for hip replacement bearing surfaces. OMNI life science’s patent pending process for the production of it’s proprietary ApeX-LNK Highly Cross-linked polyethylene acetabular cup liners represents the state of the art in polyethylene technology for orthopaedic applications.

ApeX-LNK Highly Cross-linked Polyethylene represents the state of the art in polyethylene technology for Orthopaedic Applications. Not all highly cross-linked polyethylenes are the same. The ApeX-LNK polyethylene used in Interface Acetabular liners has been specifically formulated and processed to optimize its performance in hip replacement applications.

Results:

The ApeX-LNK process provides 88% wear reduction in hip simulator testing compared to standard polyethylene*. The patent pending ApeX-LNK annealing and packaging system virtually eliminates free radicals and prevents oxidation. You can be confident that ApeX-LNK Polyethylene is optimally cross linked, packaged, and sterilized for performance and safety.

36mm ApeX-LNK Hihgly Cross-linked Polyethylene liners used in conjunction with 36mm 12/14 taper femoral heads provide an improved head/neck ratio, which leads to excellent range of motion prior to impingement.

Range of motion shown for Apex Modular and Apex K2 hip stem with 12/14 taper modular neck (worst case).

Acetabular Cup Implant Surgical Instrumentation

The instrument system is designed to be simple and conventional, yet very accurate. Femoral canal preparation essentially consists of a femoral neck osteotomy, a distal reaming operation, a proximal tapered conical reamer, and a rasp. The cutting area of the rasp is primarily in the medial calcar region: most of the stem body consists of cylinder and a cone, including the proximal anterior, posterior, and lateral surfaces that match the tapered reamer. The rasp serves as the stem trial, with the modular neck trials that attach to the broach. The modular neck trials engage both the stem trial (rasp) and the femoral implant, which will allow the surgeon to perform a range of motion and stability check prior to final neck selection.