MetaFix
Cementless Total Hip Replacement
The use of cementless total hip replacements has increased over recent years. In 2004 the UK national joint registry reported that 21% of hip replacements used a cementless implant; by 2008 this had grown to 35%(1). Similar growth trends have been reported across Europe and globally. With this increase in demand for cementless hip prostheses, the MetaFix stem design and instrument platform are ideally positioned to become the universal choice for a cementless total hip replacement.
MetaFix is a collarless, cementless, fully coated hydroxyapatite implant that utilises world class stem design principles proven over 20 years(2).
Design
The double-taper trapezoidal design resists axial and torsional displacement, providing excellent stability. The tapered distal region is supported and stabilised by the proximal loading of the stem.
The low modulus of elasticity of titanium reduces the mismatch with the cortical bone and minimises thigh pain(3).
- MetaFix is manufactured from forged titanium alloy (Ti-6Al-4V), ensuring high fatigue resistance, strength and biocompatibility.
- Low profile polished neck increases the head-neck ratio, reducing impingement and increasing the range of motion for the patient.
- Low profile shoulder is bone conserving in the greater trochanteric region and allows for ease of use in smaller incision surgery.
- Metaphyseal flare ensures maximum fixation and load transfer into the proximal femur.
- Hydroxyapatite coating thickness of 155μm provides an initial press-fit and promotes rapid fixation(4). The horizontal and vertical grooves in the stem also ensure fixation is maximised by increasing the area for bone contact.
- Horizontal grooves in the proximal stem, supported by dense cancellous bone, provide axial stability preventing subsidence.
- The three neck offset options allow the surgeon to restore the patient’s natural biomechanics. All three neck varieties are available in sizes 0-10, offering a total of 33 different stem solutions: 135° Standard, 135° Lateralised and 125° Coxa Vara.
Versatility
Patients with high activity levels demand a high range of motion from their hip. For this reason the MetaFix total hip replacement is designed with a low profile neck to maximise the range of motion without compromise to the strength of the implant. The implant neck has also been designed to meet the highest international standards for fatigue strength.
References:
1. National Joint Registry – 6th Annual Report.
2. Hallan G, Lie SA, Furnes O, Engesaeter LB, Vollset SE, Havelin LI. Medium and long
term performance of 11516 uncemented femoral primary stems from the Norwegian
arthroplasty register. J Bone Joint Surg [Br] 2007 Dec;89(12):1574-80.
3. Chambers B, St. Clair SF, Froimson MI. Hydroxyapatite-coated tapered cementless
femoral components in total hip arthroplasty. J Arthroplasty 2007 Jun. Vol. 22 No. 4
Suppl.: 71-74.
4. Hardy D, Frayssinet P. Hydroxyapatite-coated femoral arthroplasties: A long term
study through 29 Corail prostheses explanted during a ten-year survey. Surgical
Technology International X. 2003.
Important: Not all products are available or cleared for distribution in all international markets. For more details, please contact your local subsidiary or distributor by visiting the Corin worldwide section.
