Medacta Corporate

Evolving Safety

EVOLVING SAFETY

Mpact offers a system of hemispherical press-fit acetabular shells in titanium alloy that provides different solutions according to patient needs, addressing primary and revision indications.

Cementless hemispherical shell design with porous coating surface treatment has a long and successful clinical history.[1,2]
The Mpact shells follow this philosophy, enhancing primary and biological secondary stability thanks to Mectagrip, highly porous plasma spray coating.[3]

OPTIMAL PRIMARY AND SECONDARY STABILITY
Thanks to the coefficient of friction, pore size and distribution of Mectagrip[3, 4]

LOCKING SYSTEM FOR THE LINER
Which minimizes micro-movements, preventing backside wear[5,6]

CERAMIC LINERS FOR REVISION CASES
Due to the optimized thickness of the Rim-Hole shell

EASY INSTRUMENTATION
For a straight forward surgery for any preferred approach

MULTIPLE SHELL VERSIONS
Available to secure adequate fixation to the available bone stock

OPTIMIZED FEMORAL HEAD/SHELL DIAMETER RATIO
Head 36 mm available from shell size 52 mm

TWO-HOLE SHELL

From size 46 mm to size 66 mm

MULTI-HOLE SHELL

From size 46 mm to size 76 mm

RIM-HOLE SHELL

From size 56 to size 76 mm

POLYETHYLENE LINERS

Are available in Highcross crosslinked UHMWPE both in flat and hooded version

CERAMIC LINERS

Are available in BIOLOX delta by CeramTec

CANCELLOUS BONE SCREWS

Are available in lengths of 15 mm to 70 mm

CORTICAL BONE SCREWS

Are available in lengths of 25 mm to 55 mm

MECTAGRIP TECHNOLOGY

Mectagrip is the porous coating treatment applied to the Mpact shells, consisting of a layer of commercially pure titanium deposited through a special Vacuum Plasma Spray technique (VPS). The VPS method used to deposit the Titanium porous coating on the implant shows potential advantages:

Pure titanium composition for optimal biocompatibility;
High friction coefficient increasing grip at the bone interface with bone;
[4]
Favourable environment for bone:[3,7,8,9]

  • pore sizes of 100-350 μm
  • open pores with high porosity level
  • continuous interconnected pores.

ADVANCED LOCKING MECHANISM

Locking systems for the polyethylene liners:

  • A clipping system placed out of the equatorial weight bearing area in the thickest region of the liner. This design reduces stresses at the liner/shell interface and minimizes the risk of the liner rim fracture should impingement occur.[10]
  • The match between anti-rotation tabs in the liner and indentions on the shell limits rotational micro-movement and potential backside wear.[5,6]

MULTIPLE REVISION OPTIONS

The MULTI-HOLE SHELL allows for the use of cancellous bone screws in 12 to 17 locations (size dependant) on the dome and equatorial region.

 

The RIM-HOLE SHELL allows use of cancellous and cortical bone screws
CERAMIC LINERS are available with the Rim-Hole shell from size 56 to size 70 mm

REDEFINING THR: THE AMIS SYNERGY

The anterior approach, strengthened by several years of clinical experience, is the only technique which follows a path both intermuscular and internervous and therefore reduces considerably the risk of damaging periarticular structures such as muscles, tendons, vessels and nerves.

Medacta International is the world leader for educating and supporting surgeons in their pursuit of Anterior Minimally Invasive Surgery (AMIS). Reference Centers, located throughout the world, provide the necessary AMIS educational experience and Medacta offers continuous support for surgeons, as well as constantly improving and developing the industries most specialised instrumentation platform.Using AMIStem you can enter Medacta International’s world of AMIS.

Discover:

  • The definitive MIS approach: AMIS;
  • Dedicated AMIS instrumentation;
  • The AMIS Mobile Leg Positioner: the original orthopaedic extension table included as part of the instrumentation that makes the surgery easier and reproducible;
  • The AMIS Education Program based on Medacta’s proven educational methods.

The AMIS Mobile Leg Positioner will be supplied as part of the instrumentation to help ensure effective and reliable positioning of the leg during surgery. Traction, adduction and hyperextension have never been so easy.

[1] C Anderson Engh, Cementless acetabular components,JBJS (Br), vol. 72-b, No. 1, Jan 1990, 53-60. 
[2] S. J. Incavo, F. A. Di Fazio, J. G. Howe, Cementless Hemispherical Acetabular Components, JoA Vol. 8, no. &, 1993, 573-80.
[3] P. Robotti, A. Sabbioni, L. Glass, B. George, Macroporous Titanium Coatings, by Thermal Plasma Spray, ITSC 2013, International Thermal Spray Conference, May 13 –15, 2013, Busan, Korea.
[4] Friction testing of the Mpact and Versafitcup coating samples. Data on file Medacta.
[5] Mpact liner wear test. Data on file Medacta.
[6] Push-out, lever-out and torsion test on the Mpact shell. Data on file Medacta.
[7] J. E. Biemond et al, In vivo Assessment of Bone Ingrowth Potential of 3-Dimensional E-Beam Produced Implant Surfaces and the Effect of Additional Treatments by Acid-Etching and Hydroxyapatite Coating, J. Biomat. Appl, published on line January 27, 2011, 0885328210391495.
[8] R. Ferro de Godoy et al., In vivo Evaluation of Titanium Macro-Porous Structures Manufactured Through an Innovative Powder Metallurgy Approach. Proceedings eCM XIII: Bone Fixation, Repair & Regeneration, June 24–26, 2012, Davos, Switzerland.
[9] A. Goodship et al, In-vivo Assessment of the Ingrowth Potential of Engineered Surface Topographies Produced by Spark Plasma Sintering, Proceedings 9th World Biomaterial Congress, June 1-5, 2012, Chengdu, China.
[10] Michael DR, MD, Review of the Evolution of the Cementless Acetabular Cup, ORTHOSuperSite December 1, 2008.