Informatie voor medisch specialisten | Biomet

Copeland™ EAS™ Humeral Resurfacing Head

The Copeland™ EAS™ (Extended Articular Surface) Humeral Resurfacing Head is based on the clinically proven Copeland™ Humeral Resurfacing Head.

The standard Copeland™ Shoulder prosthesis has been used for the treatment of rotator cuff arthropathy by implanting the prosthesis in a superior fashion which provides a smooth articulation to the humerus with the acromium, which will relieve pain. This however, requires a manual repositioning of the prosthesis. The new Copeland™ EAS™ system uses the standard positioning of the prosthesis, and with one extra set of chamfer cuts, the new prosthesis resurfaces the whole of the head and greater tuberosity site.

The EAS™ Head for metal-on-bone articulation provides a conservative stemless option, to benefit patients who have Humeral/Acromioclavicular impingement pain due to a deficient Rotator Cuff.

Design

The design of the Copeland™ EAS™ Shoulder has the same key features as the Copeland™ Shoulder, with the addition of a superior Extended Articular Surface for Humeral-Acromioclavicular Articulation.

Key Design Features include:

Extended Skirted Rim and Tapered Cruciform Peg to ensure secure Press Fit Fixation

Closed Pore Porous Coating and Hydroxyapatite for minimal wear debris ingress and long term fixation(2,3)

Titanium Porous Coating for excellent biocompatibility(2)

Top Loading System

8 Sizes of Prostheses available to mimic normal anatomy as closely as possible

Easy Conversion to a Stemmed Component:
• Remove resurfacing component only and replace with a stemmed implant; or
• Resect the Humeral Head and component together and continue with a stemmed implant

Instrumentation and Technique

The Copeland™ Shoulder technique is minimally invasive and preserves bone stock, with the added benefit of simple colour-coded instrumentation to aid the surgical team. The surgical technique is based on a 4-Step Bone Preparation:

1. Locate the centre of the Humeral Head
2. Ream to define and restore Humeral Head shape
3. Drill for central peg.
4. Use cutting guide to shape head for extended articular surface placement.

Proven Clinical Results

(1) Mullett H, Levy O, Raj D, Even T, Abraham R, Copeland S A, Copeland Surface Replacement of the Shoulder – Results of an Hydroxyapatite-Coated Cementless Implant in Patients over 80 years of age, International Congress of Shoulder and Elbow Society, Brazil, 2007
Highlights of this study include:

Between 1993 and 2002 a series of 209 shoulders underwent resurfacing arthroplasty.
==> 180 hemi arthroplasty
==> 29 total shoulders

	Pre-Op Scores	Post-Op Scores
Constant Score	12	63.1
Forward Flexion (degrees)	68.1	115.9

• No humeral radio-luciencies witnessed throughout this series

• The survival rate of HA coating is 98% @ 10 years

• Kaplan Mier Analysis suggests 96.4% survival rate for the prosthesis @ 10 years

• The revision rate for the HA coated Mark IV, launched in 1993 is 2.6%. Moreover, revisions in OA are 0.7%, amounting to one revised prosthesis!

• Hemi and total arthroplasty were no different in terms of functional outcome in this series.

Conclusion

There are still no luciencies reported since introduction of HA Coating.

OA patients still achieve the best functional scores

16% of the patients in this series had total shoulder arthroplasty, proving you can replace the glenoid with a Copeland Shoulder!

(1) Mullett H, Levy O, Raj D, Even T, Abraham R, Copeland S A, Copeland Surface Replacement of the Shoulder – Results of an Hydroxyapatite-Coated Cementless Implant in Patients over 80 years of age, International Congress of Shoulder and Elbow Society, Brazil, 2007
(2) Bourne RB, Rorabeck CH, Burkart BC, Kirk PG. Ingrowth Surfaces. Plasma spray Coating to Titanium Alloy Hip Replacements. Clin. Orthop 1994 Jan; 298: 37-46
(3) Soballe K, Toksvig-Larsen S, Gelinek J, Fruengaard S, Hansen S, Ryd L, Lucht U, Bunger C. Migration of Hydroxyapatite Coated Femoral Prosthesis. JBJS Vol. 75-B. No 5. Sept. 1993