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Clinical Fallout – Hip Resurfacing – The Corin Involvement

This YouTube video clip from the very respected McMinn Centre in the UK – the original developers of the Birmingham Hip Resurfacing – is quite enlightening.

The video highlights metal-on-metal problems in replacement hips have been known for 20 – 30 years or more.

It appears from this scientific report that Corin was involved with the early manufacture and that they or their contractor made changes to the manufacturing process, apparently without the surgeon’s knowledge and this contributed to metallosis and failure compared to the original “as cast” cobalt chrome implants.

It will be illuminating to chart Corin’s development from there and what other little skeletons are lying around…

Corin Hip Products

Website – click here

Cormet

Advanced Hip Resurfacing System

Activity

Today’s younger patients demand more from their surgery – a long-lasting implant and a return to previous levels of activity. Cormet offers the choice of both cementless and cemented femoral components with optimised geometry, allowing minimal bone removal. The stable low-wear bearing forms an enduring bone-conserving implant, facilitating patient expectations of a return to an active lifestyle.

History

From the pioneers of modern day hip resurfacing, the Cormet is founded on over 20 years’ expertise in metal-on-metal hip resurfacing. Based on an early vision in the late 1980s, the Cormet advanced hip resurfacing system was launched in 1997 and today offers surgeons a wide range of implants, including the only proven cementless head, to treat the young, active patient.

Technology

Incorporating advanced bearing technology, the Cormet hip resurfacing system demonstrates:

  • Optimised design specifications – based on the effects of sphericity, bearing clearances, metallurgy, adverse gait and acetabular inclination – to optimise clinical performance.
  • Precision-machined components are designed to ensure sphericity and minimum surface roughness, delivering a high performance, low-wear articulation.
  • Low-wear metallurgy for a more forgiving, high-performance bearing(1).
  • Stability through large diameter design, minimising dislocation and optimising range of motion(1).

References:

1. Angadji A, Royle M, Collins SN, Shelton JC. A hip simulator study on the effect of cup inclination on the wear of ‘as cast’ and ‘double heat-treated’ metal-on-metal hip replacements. ORS March 2007: Poster.

Optimom

Large Diameter Metal-on-Metal Hip System

Optimom, part of Corin’s Total Cementless Hip System is a large metal bearing that locates on a femoral stem (such as Corin’s MiniHip or MetaFix), and is articulated against the Cormet resurfacing cup to create a large diameter metal-on-metal (LDMOM) bearing for use in a total hip replacement.

LDMOM bearings are intended for use in young, active patients, as a revision option for patients with resurfacing heads or as a primary option for patients not suitable for resurfacing. The large diameter heads produce lower dislocation rates and an increased range of motion when compared to conventional total hip replacements, which together permit the patient to return to high activity levels(1).


References:

1. Nevelos J, Nelson R, Shelton J, Krikler S, Bishay M, Banan H, Pring D, Richardson J, Spencer R. Development validation and multi-centre follow-up of a modern metal-metal hip resurfacing prosthesis. AAOS 2004 Scientific Exhibit SE005.

Early intervention hips

Revision hips

Ligament reconstruction

Primary hips

References:

1. Wood PLR, Deakin S. Total ankle replacement. The results in 200 ankles. J Bone Joint Surg (Br) 2003; 85-B:3:334.

2. Saxler G, Temmen D, Bontemps G. Medium-term results of AMC-unicompartmental knee arthroplasty. The Knee 2004; 11:39-355.

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