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The Stryker Rejuvenate and ABG II modular-neck hip stems are components of metal-on-metal hip replacement systems that connect the “stem” portion of the implant (that anchors the implant in the thigh bone) to the head or “ball” portion (that rests in the socket to complete the joint). Components are manufactured of a proprietary cobalt-chrome alloy developed by Stryker known as GADS (Gas Atomized Dispersion Strengthened) Vitallium.
According to Stryker, the devices are designed to give surgeons the ability to better match the implant with the patient’s anatomy. Each system comes with an array of options to fit different biomechanical needs, and were marketed as especially suited to cases where patients suffer from hip dysplasia, post-traumatic arthritis, and other deformities that pose challenges when fitting standard components. 1
Reports of problems with modular-neck hip stems led the company to voluntarily issue recalls of certain Stryker components.
Surgical Options for Stryker Implants
Metal on metal bearings can produce small metallic wear debris or corrosion can take place with the constant movement between the two metal surfaces.
Surgical options depend on the surgeon’s preferences and a variety of patient factors. Each surgeon can use the surgical approach for total hip arthroplasty with which he or she is most familiar. Also, patient positioning, prepping and draping, the skin incision, soft tissue dissection, and hip dislocation is often performed according to the surgeon’s preferred technique.
Each procedure will differ based on the essential preoperative planning. Optimal femoral stem fit, prosthetic neck length, angle and version can be more closely evaluated with the use of preoperative X-ray analysis. Patients and family members should be sure to talk with surgeons during the planning and preoperative analysis to ensure that they understand the choices the surgeon is making for them.
Stryker Implants: Rejuvenate and ABG II Systems
The Rejuvenate and ABG II modular systems were designed for primary and revision total hip arthroplasty, compatible with other Howmedica Osteonics (later Stryker Orthopaedics) products at the time of their introduction. The company recommends use with cementless implantation, meaning their design allows bone to knit itself to the implant rather than utilizing bone cement for fixation.
The systems are implemented in the following ways:
- Non-inflammatory degenerative joint disease including osteoarthritis and avascular necrosis
- Rheumatoid arthritis
- Correction of functional deformity
- Revision procedures where other treatments or devices have failed
- Treatment of nonunion, femoral neck and trochanteric fractures of the proximal femur with head involvement that are unmanageable using other techniques