Proven Coating Fixation Technologies
Without initial and long–term component fixation, a surgeon’s efforts to restore joint function are lost. With the Pinnacle cup, fixation is achieved through 180° of either POROCOAT®, DUOFIX™ with Hydroxyapatite (HA) or GRIPTION® Coating.
The proven cementless coating fixation technologies1-3 are based on the outstanding clinical performance4-6 of POROCOAT Porous Coating, which was introduced with the AML® cup in 1977, with the DURALOC® cup 1980 and with the PINNACLE cup in 2000. Therefore it has been clinically tracked for over 30 years.4-6,7 The DUOFIX Fixation System was introduced with PINNACLE cups in 2003 being an evolutionary combination of POROCOAT Porous Coating and highly amorphous hydroxyapatite (HA). Finally, in 2009 the GRIPTION cup fixation technology emulated the reliable foundation of the POROCOAT Porous Coating being also an evolutionary development in implant fixation technology due to an advanced 3D structure.5,6,8-11
Commercially pure titanium sintered metal particles on a POROCOAT substrate.
GRIPTION fixation technology was introduced in 2009 and emulates the reliable foundation of the POROCOAT Porous Coating and is an evolutionary development in implant fixation technology. This advanced 3D structured fixation is designed to maximise initial ‘scratch fit’ stability due to an industry leading coefficient of friction,9 which can lead to long-term biological fixation.9,10
It is specifically engineered to maintain a clinically advantageous 80% surface volume porosity and 300-micron pore structure in average.5,9,10 This allows for good tissue growth and vascularisation onto and around an implant. Combined macrotexture and microtexture topographies can provide a favorable mechanical loading environment for bone reconstitution and enable greater cell adhesion and proliferation.12
Commercially pure titanium sintered beads.
The proprietary POROCOAT Porous Coating has been unchanged in structure since its introduction in 1977. It is composed of commercially pure titanium sintered metal beads, which allow bone to affix biologically into the porous coating. It has a pore size of 250 microns in average, which is documented in a laboratory study8 to be a beneficial size for penetration of bone tissue. The high coefficient of friction is designed to enhance the ‘scratch-fit’ and therefore to improve the initial stability of the PINNACLE acetabular cup.
With more than 30 years of clinical heritage and a 8 years follow-up showing 96.1% survivorship, PINNACLE cups with POROCOAT Porous Coating have been successful in achieving stability and long-term fixation.7
Combination of POROCOAT Porous Coating and highly amorphous hydroxyapatite (HA)
The DUOFIX Fixation System was introduced with the PINNACLE in 2003 and is a combination of Porocoat Porous Coating and highly amorphous hydroxyapatite (HA). It is composed of commercially pure titanium sintered metal beads, which allow bone to affix biologically into the porous coating. Plasma spray flame applications provide a consistent layer of HA to accelerate osteointegration and aid in achieving early fixation.11
- Onodera S, et al. Cementless total hip arthroplasty using the modular S-ROM prosthesis combined with corrective proximal femoral osteotomy. J Arthroplasty. 2006 Aug;21(5):664-9.
- Mattingly DA. The S-ROM modular stem for femoral deformities. Orthopedics. 2005 Sep;28(9 Suppl):s1059-62.
- Chiu KY, et al. Cementless total hip arthroplasty in young Chinese patients: a comparison of 2 different prostheses. J Arthroplasty. 2001 Oct;16(7):863-70.
- Grobler GP et al. Ten-year results of a press-fit, porous-coated acetabular component. J Bone Joint Surg Br 2005;87:786-9.
- Engh CA, et al. “Porous-Coated Total Hip Replacement.” CORR 298, 1994: 89-96.
- Engh CA, et al. ‘The Odyssey of Porous-Coated Fixation’. J Arthroplasty 2002;17(4) 102-107.
- DePuy Orthopaedics, Inc. Internal Study Update. PINNACLE Multi-Liner Acetabular Cup in a Prospective Multi-Center Study. May 2011.
- Bobyn JD, Pilliar RM, Cameron HU, Weatherly GC. The optimum pore size for the fixation of porous surfaced metal implants by the ingrowth of bone. Clin Orthop 1980;150:263-270.
- DePuy Internal Test Report: WR070146; 2007.
- DePuy Internal Test Report: WR070125; 2007.
- Frayssinet, P., et al. “Natural History of Bone Response to Hydroxyapatite-Coated Hip Prostheses Implanted in Humans.” Cells and Materials Feb. 1995: 125-138.
- Karageorgiou V, et al.: Porosity of 3D biomaterial scaffolds and osteogenesis. Biomaterials 2005;26:5474-91.