Cementless Press-Fit Cup Principles, Experimental Data, and Three-Year Follow-Up Study

Morscher, E; Bereiter, H.; Lampert, C.

doi:10.1097/00003086-198912000-00003

Cited by 48 publications

(18 citation statements)

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“…Axial forces and displacement were 586b / 8h15$$586b 07-14-98 12:04:51 jbma W-JBM in metal backed models, which ranged from 3.2 to 6.3 MPa. 30,31 Also, interfacial tensile strength of the best osteointegrated interface between the porous metal surface and bone is about the same order of magnitude as the maximum strength observed in this study. 49 The relative amount of the chemical bonding and mechanical interdigitation between the PMMA layer and the UHMWPE surface are not directly quantified at this time, but they are in progress in the form of chemical analyses by ATR-FTIR and ESCA on tomographically sectioned surface layers.…”

Section: Methodssupporting

confidence: 75%

“…Thus, value of 6.3 MPa between UHMWPE and titanium, it is quite significant. 30 Among samples of 60 min, 20 and 40% even at a lower temperature of 100 ЊC, the solution with higher monomer concentration can possibly prevent further (v/v) monomer concentrations showed slightly low tensile strength values of 8.73 and 11.32 MPa, respectively, with MMA diffusion as the treatment time increases. This trend can also be observed from Figure 5 where samples under no statistically significant differences from that of the 50%-60-min sample.…”

Section: Methodsmentioning

confidence: 91%

“…To improve the fixation, the outer term. 30 Some clinical studies showed that the all PE cup performed better than the metal-backed cemented surface of the acetabular cup or the tibial plateau was designed with deep grooves for mechanical interlocking with cups. 3,34,38,39 Therefore, the metal-backed cup, which is designed to reduce the stresses in the bone-bone cement the bone cement.…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, studies on metal-back cups revealed that preservation of some elasticthe surface of the UHMWPE and PMMA bone cement was stressed for the improvement of prosthesis fixation in the ity lost from hard metal shell liners is necessary for longterm success. 5,30 long term. Furthermore, fixation with screws, pegs, and metal backings were introduced to minimize the inherent Previous studies have reported that the main cause of the long-term total hip revision (THR) failure is from aseptic loosening.…”

Section: Introductionmentioning

confidence: 99%

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Precoating of ultrahigh molecular weight polyethylene with polymethylmethacrylate: Interfacial strength

Kang

Park

1998

J. Biomed. Mater. Res.

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Fixation of polymeric implants, especially an ultrahigh molecular weight polyethylene (UHMWPE) acetabular cup, to a host bone site has been a challenge since its first conception from the Charnley low friction total hip arthroplasty. Destabilization of the acetabular cup, similar to the well-documented cases of femoral stems, is caused mainly by aseptic loosening; the mobile loosened particles further contribute to the progression of aseptic loosening. Although the obvious fixation problems lie in the bone-bone cement interface, little work has been done to reduce the loosening by improving the acetabular components as a whole in cemented procedures. Most of the grooved outer surface, external fixation devices, and metal backings have been introduced to avoid problematic fixation of the cup to bone cement; nevertheless, the designs themselves to some degree became the source of the loosening problems. One possible way to improve the adhesion of acrylic bone cement to the UHMWPE acetabular cup is precoating the surface with polymethylmethacrylate (PMMA). This study successfully precoated the UHMWPE surface with PMMA, showing good chemical and mechanical stability, and suggests the optimal conditions of variables involved in the newly developed precoating process. The highest interfacial tensile strength was 11.51 +/- 0.65 MPa, which is stronger than those of UHMWPE and metal in metal-backed cups (6.3 MPa) and bone-bone cement (8.5 MPa). Further chemical analysis and mechanical testing are in progress, yet the present result of the mechanical tensile strength test showed that the precoating process for the UHMWPE surface could be a viable means toward stable fixation of the polymeric implants by using PMMA bone cement.

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Section: Methodssupporting

confidence: 75%

Section: Methodsmentioning

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Precoating of ultrahigh molecular weight polyethylene with polymethylmethacrylate: Interfacial strength

Kang

Park

1998

J. Biomed. Mater. Res.

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“…The contralateral side was identical to the uncoated implants. This implant modification was chosen because of its similarity to clinically used implants [12,13].…”

Section: Methodsmentioning

confidence: 99%

Bone ingrowth behaviour of hydroxyapatite-coated, polyethylene-intruded and uncoated, sandblasted pure titanium implants in an infected implantation site: an experimental study in miniature pigs

Wilke

Orth

Kraft

et al. 1993

J Mater Sci: Mater Med

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We studied the dynamics of bone tissue ingrowth into the pores of hydroxyapatite-coated (plasma-spraying technique) and uncoated wire meshes of pure Ti in an infected implantation site. Samples of the test materials were implanted into the femora of 15 adult G6ttingen minipigs. Just before implantation they were contaminated with Staphylococcus aureus. The pigs were killed after 4, 8, 12 or 24 weeks. Undecalcified ground sections of bone tissue were prepared and stained with toluidine blue for comparative histological evaluation. The hydroxyapatite-coated implants already demonstrated advanced new bone formation after 4 weeks. By 12 weeks most of the implant pores were filled with newly formed bone although all samples showed macro-as well as microscopic signs of persistent infection. Comparable reactions of the uncoated implants could be observed only after 24 weeks. Signs of degradation of the hydroxyapatite coating were seen in contact with soft tissue. This was more extensive in the infected than in the uninfected site. The results and possible clinical consequences are discussed.

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Interfacial strength of compression-molded specimens between PMMA powder and PMMA/MMA monomer solution-treated ultra-high molecular weight polyethylene (UHMWPE) powder

Park

2000

J. Biomed. Mater. Res.

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The interface between bone cement and ultra-high molecular weight polyethylene (UHMWPE) has been considered a weak link of cemented UHMWPE acetabular cup in total hip replacement (THR). For the improvement of this weak interface, adhesion between the UHMWPE acetabular cup and bone cement made of polymethylmethacrylate (PMMA) has been investigated in our laboratory. Virgin UHMWPE powders were treated with methyl methacrylate (MMA) monomer and PMMA/MMA solution. The treated UHMWPE powders were then compression-molded with virgin UHMWPE powders or PMMA powders, creating two different interfaces, i. e., treated/virgin UHMWPE powder and treated UHMWPE/PMMA powder. For the present study, the interfacial strengths between PMMA powder and the treated UHMWPE power were investigated following the same protocol previously set. The maximum interfacial strength was 17.0 +/- 0.25MPa with the same molding condition of 166.5 degrees C, 38.7 MPa and l h. In addition to the molding condition, we tested the strengths for the treated UHMWPE powders, which have different ratios between PMMA/MMA solution and MMA-treated UHMWPE powders. Significant differences on the interfacial strengths resulted due to the ratio change; more PMMA in the PMMA/MMA solution-treated UHMWPE powder exhibited higher interfacial strength. Scanning electron microscopic (SEM) pictures showed that the interface is composed of three major portions: PMMA powder, UHMWPE, and coated PMMA, indicating strong mechanical interlocking of UHMWPE and PMMA powder matrix and chemical bonding between PMMA powder and the precoated PMMA onto the UHMWPE. In addition, another interfacial strength between PMMA powder, which is equivalent to the outermost part of the cup, and bone cement was investigated. The average strength reached up to 42.4 +/- 3.6 MPa, close to the tensile strength of bone cement itself.

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Cementless Press-Fit Cup Principles, Experimental Data, and Three-Year Follow-Up Study

Cited by 48 publications

References 0 publications

Precoating of ultrahigh molecular weight polyethylene with polymethylmethacrylate: Interfacial strength

Precoating of ultrahigh molecular weight polyethylene with polymethylmethacrylate: Interfacial strength

Bone ingrowth behaviour of hydroxyapatite-coated, polyethylene-intruded and uncoated, sandblasted pure titanium implants in an infected implantation site: an experimental study in miniature pigs

Interfacial strength of compression-molded specimens between PMMA powder and PMMA/MMA monomer solution-treated ultra-high molecular weight polyethylene (UHMWPE) powder

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