Evolving Safety
Mpact System is a comprehensive hemispherical cup platform featuring different shell and liner designs and materials allowing for efficiently treating the majority of the clinical cases from primary to revision surgeries, according to patients’ needs.
The Mpact system makes use of different advanced materials and manufacturing technologies.
Both MectaGrip and 3D Metal allow for designing and manufacturing implants featuring a high friction coefficient, increasing grip at the bone interface, thereby obtaining a superior primary stability.[2] Moreover, the porous structure parameters in line with the commonly accepted parameters[2,5] create a favorable environment for the bone.[6,7,8,9] The efficient connection with the bone has been validated by means of an animal study in young sheep.[2]
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MectaGrip is a 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). Titanium porous coating allows for an enhanced biocompatibility, thanks to the pure titanium composition and optimized porosity.
3D Metal is an advanced biomaterial structure that is finely engineered for the bone. It is made of Titanium alloy (Ti6Al4V), and it is obtained by means of 3D printing technology, an innovative one-step layer-by-layer additive manufacturing process (not a coating).
This advanced technology allows for designing different engineered 3D net structures starting from a CAD model in a precise, predictable and reproducible manner. By means of a single technology it is possible to efficiently face most clinical cases, from standard primary to complex revision surgeries.
No-Hole
Mpact No-hole
From size 42 mm to size 66 mm
Two-Hole
Mpact Two-hole
From size 42 mm to size 66 mm
Mpact 3D Metal Two-hole
From size 42 mm to size 66 mm
Mpact Multi-hole
From size 42 mm to size 76 mm
Mpact 3D Metal Multi-hole
From size 46 mm to size 72 mm
Mpact 3D Metal Multi-hole Thin
From size 42 mm to size 60 mm
The MULTI-HOLE SHELLS allow for the use of cancellous bone screws in 13 to 17 locations (size dependent) on the dome and equatorial region.
CANCELLOUS BONE SCREW
Ø 6,5 mm from L 15 mm to L 70 mm
COMPRESSION POLYAXIAL LOCKING SCREW
Ø 6,5 mm from L 15 mm to L 70 mm
Compatible with Mpact 3D Metal Multi-hole only
(non-Thin version)
DM
Mpact DM
From size 42 mm to size 66 mm
Flat
UHMWPE Highcross Liner
Hooded
UHMWPE Highcross Liner
Offset 4 mm
UHMWPE Highcross Liner
Face-Changing 10°
UHMWPE Highcross Liner
Double Mobility
UHMWPE Highcross Liner
Ceramic Liner
Compatible with No-hole, Two-hole, 3D Metal Two-hole and 3D Metal Two-hole
The Clipping system for the polyethylene liners is placed outside 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 in case of impingement.[1]
Therefore, the match between the anti-rotation tabs in the liner and the indentations on the shell limits rotational micro-movements and potential backside wear.[2,3]
18° taper angle has been demonstrated to have a lower malseating rate if compared to different ceramic taper angle versions.[3,4] This tapered surface has been successfully adopted for all Medacta cups since 2005.[2]
[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.
