Biomet Hip Replacements

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Biomet Hip ImplantBiomet, a medical device company, was established in Indiana back in 1977. They manufacture products dealing primarily with the musculoskeletal system of the human body and can be used with surgical and non-surgical techniques. The company specializes in hip & knee products, extremity products, surgical products, bone cement & accessories. Biomet and its subsidiaries have thousands of employees and the company currently distributes products to approximately 90 countries.

Hip products

Following are the famous and commonly used hip products:

  • Active Articulation™ Dual Mobility Hip System
  • Arcos Modular Femoral Revision System
  • G7™ Acetabular System
  • ReCap Femoral Resurfacing System
  • Regenerex Porous Titanium Construct
  • Signature™ Hip Technology Personalized Patient Care
  • Taperloc Complete Hip Stem
  • Regenerex RingLoc + Modular Acetabular System
  • E1 Antioxidant Infused Technology
  • Echo™ Hip System
  • M2a-Magnum™ Large Metal Articulation
  • Biolox delta Ceramic Femoral Heads

Types of hip products

The Biomet hip products fall into the following categories:

  1. Femoral components
  2. Acetabular components
  3. Revision components which are post-surgically used products for replacing the faulty and failed components.

Metal-on-metal hip implants

Many types of materials have been used for implants with mixed results. Metal-on-metal and metal-on-polyethylene were very common with similar results. Nowadays, Biomet manufactures metal-on-metal implants using Cobalt (Co) and Chromium (Cr) metals. The famous products of this line include M2a Magnum hip implant, Stanmore and Exceed ABT. The metal-on-metal hip implants fall into following two categories:

1. Metal-on-metal total hip replacement systems

This system includes both femoral and acetabular components. The total hip joint is replaced by a metallic prostheses. An acetabular capsule is prepared on the pelvis and the complementary femoral component is properly placed in the shaft of the femur. These two surfaces articulate to produce a wide range of motions similar to natural hip joint. An example is M2a Magnum hip implant.

2. Metal-on-metal resurfacing hip systems

Metal-on-metal resurfacing hip systems are preferred sometimes because they preserve the bone on the femoral side. In case of a faulty or failed implant, the reserved bone can be used for a total hip replacement.

M2a magnum hip implants

Biomet offers seven different metal-on-metal implants. The prototype metal-on-metal hip implant was first introduced in May 1996 under the trade name, “M2a-RingLoc”. It was followed by 28mmM2a-Taper, 32mmM2a-Taper, M2a-38, ReCap-Femoral and M2a-Magnum in October 2004. The M2a-magnum has larger diameter heads for articulations.

Biomet has introduced the seventh and latest type of hip implant, “M2a-Magnum TriSpike” in 2006. It is designed for high stability. The Tri-Spike cup combines screw-like stability with the low wear, high range of motion and dislocation resistance of the M2a-Magnum cup.

Harmful effects of M2a Hip implants

The harmful effects of M2a Hip Implant system is diverse and include:

Pain:

It is very common complication especially in the younger patients. Almost 20% of patients complain of post-operative pain at the site of implantation. It is usually associated with signs of inflammation, redness, tenderness, swelling and warmth.

Metallosis:

The deposition of metal debris resulting in increased plasma concentration of metals, results from shaving off metals by friction. In a recent study, it was demonstrated that almost all the patients suffer from severe metallosis after 10 year of metal-on-metal implant.

Loosing and Dislocation:

Surfaces of the implant can wear down and loosen leading to complications and joint dislocation.

Fractures:

The bone can weaken and fracture while attempting to hold the implant in place. This complication is more common in post-menopausal females.

Revision Surgery After Device Failure:

There are a variety of problems than can lead to revision surgery. Mechanical failure, infection and recurrent hip dislocation can all prompt a doctor to consider a revision surgery. Often the revision surgery is more dangerous than the initial surgery and can further damage the area of the implant.

View Sources

  1. Zijlstra, W.P., et al., No superiority of cemented metal-on-metal vs metal-on-polyethylene THA at 5-year follow-up. Orthopedics, 2009. 32(7): p. 479. http://www.ncbi.nlm.nih.gov/pubmed/19634856
  2. Gross, T.P. and F. Liu, Hip resurfacing with the Biomet Hybrid ReCap-Magnum system: 7-year results. J Arthroplasty, 2012. 27(9): p. 1683-1689 e2. http://www.ncbi.nlm.nih.gov/pubmed/22595183
  3. Sturup, J., et al., Few adverse reactions to metal on metal articulation in total hip arthroplasty in a review study on 358 consecutive cases with 1 to 5 years follow-up. Open Orthop J, 2012. 6: p. 366-70. http://www.ncbi.nlm.nih.gov/pubmed/22930667
  4. Gross, T.P. and F. Liu, Incidence of adverse wear reactions in hip resurfacing arthroplasty: a single surgeon series of 2,600 cases. Hip Int, 2013. 23(3): p. 250-8. http://www.ncbi.nlm.nih.gov/pubmed/23760745
  5. Lardanchet, J.F., et al., One-year prospective comparative study of three large-diameter metal-on-metal total hip prostheses: serum metal ion levels and clinical outcomes. Orthop Traumatol Surg Res, 2012. 98(3): p. 265-74. http://www.ncbi.nlm.nih.gov/pubmed/22480865
  6. Bowsher, J.G., et al., Surface damage after multiple dislocations of a 38-mm-diameter, metal-on-metal hip prosthesis. J Arthroplasty, 2008. 23(7): p. 1090-6. http://www.ncbi.nlm.nih.gov/pubmed/18534503
  7. Beaule, P.E., et al., Jumbo femoral head for the treatment of recurrent dislocation following total hip replacement. J Bone Joint Surg Am, 2002. 84-A(2): p. 256-63. http://www.ncbi.nlm.nih.gov/pubmed/11861732
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