Loosening of the porous coating of bicompartmental prostheses in patients with rheumatoid arthritis.

Rosenqvist, R; Bylander, Birger; Knutson, Kaj; Rydholm, Urban; Rööser, Bo; Egund, Niels; Lidgren, Lars

doi:10.2106/00004623-198668040-00009

Cited by 70 publications

(16 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Also, in vitro wear studies proved that PMMA bone cement particles can cause abrasive wear on the metal. [21][22][23] To identify whether there was PMMA-related wear in these retrieved knee joints, we divided the surface roughness data into two groups according to fixation method; one group used PMMA for component fixation, and the other was fixed by bone ingrowth. No significant surface roughness difference occurred between the two groups.…”

Section: Discussionmentioning

confidence: 99%

“…[21][22][23] Rosenqvist et al showed that 22 femoral and tibial components from 34 knees were associated with loose beads. In fact, 7 of them showed loose beads after only 3 months of implantation.…”

Section: Introductionmentioning

confidence: 99%

“…In fact, 7 of them showed loose beads after only 3 months of implantation. 23 Cooke discovered metal beads in the joint space and soft tissues after only 8 months of implantation. In Cooke's study, both the synovial membrane and fibrous connective tissue adhering to the tibial component contained discrete metal particles.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Surface roughness of retrieved CoCrMo alloy femoral components from PCA artificial total knee joints

Que

Topoleski

Parks

2000

J. Biomed. Mater. Res.

View full text Add to dashboard Cite

In this study, we analyzed the surface roughness of retrieved cobalt-chromium-molybdenum (CoCrMo) femoral components of porous coated anatomic (PCA) artificial total knee joints, using a white light interference surface profilometer (WLISP). Thirty-eight PCA retrieved specimens obtained from the Anderson Clinic (Arlington, VA) were used. The artificial knees were originally implanted between 1982-1993, and the specimens were retrieved during revision surgeries between 1988-1996. We examined specimens damaged by three wear modes: femoral component against the ultra high molecular weight polyethylene (UHMWPE) articular surface (mode I), femoral component against the metal tibial tray (because of UHMWPE tibial component wear-through) (mode II), and femoral component against metal-debris-embedded-UHMWPE (with metal debris from the porous coating) (mode III). The mean surface roughness of each femoral component was the average of 80 surface roughness measurements. The in vivo alloy femoral component surfaces were rougher by an order of magnitude over controls, and the alloy surfaces were predominantly worn by the formation of parallel scratches in the direction of articulation. There was no correlation between the surface roughness of the femoral components and patient age, sex, weight, and total time of implantation. Significant surface roughness increases accompanied mode II and mode III wear. Different carbide morphologies were found on different femoral component surfaces, indicating that a variety of sintering processes, with different times and temperatures, may have been applied to the alloy femoral components during manufacture. Metal component roughness may be important to the wear of UHMWPE components and the success of total artificial knee joint.

show abstract

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Surface roughness of retrieved CoCrMo alloy femoral components from PCA artificial total knee joints

Que

Topoleski

Parks

2000

J. Biomed. Mater. Res.

View full text Add to dashboard Cite

show abstract

“…The presence of the green brown deposited layer could be indicative of a form of chromium hydroxide. 22 Hydroxide of divalent chromium, or Cr(OH) 2 , is yellow in color while Cr(OH) 3 and Cr(OH) 4 are green and brown solid substances, respectively. However, Urban et al 23 have reported a similar corrosion product on retrieved modular hip prostheses as a chromium orthophosphate hydraterich material.…”

Section: Discussionmentioning

confidence: 99%

Effects of microstructure on the corrosion behavior of CoCr porous coatings on orthopedic implants

Placko

Brown

Payer

1998

J. Biomed. Mater. Res.

View full text Add to dashboard Cite

Cobalt-chromium alloy porous coatings have become increasingly popular as a means of achieving a stable, longer lasting fixation on orthopedic implants. However, sintering heat treatments cause changes in the microstructure that result in changes in the corrosion behavior of the porous coatings. Experiments were conducted to examine the effects of microstructure on the corrosion of CoCr porous coatings. Four distinct microstructures were characterized. Light microscopy revealed microstructures A and B had relatively fewer carbides and a large-grain structure, microstructures C and D displayed a finer grain size with significant carbide formation, predominantly within grains and fusion zones. Accelerated anodic corrosion experiments were conducted to study the localized attack of each microstructure. Experiments were conducted using metallographically polished porous-coated disks for durations of 1, 4, 16, 24, and 72 h. The disks were examined with SEM and EDS to observe preferential attack and element depletion. Results showed a progressive dissolution of the matrix, with preferential attack of the grain boundaries and regions adjacent to the carbides due to sensitization. A precipitation layer was found to be Cr-rich and possibly composed of chromium hydroxide or a chromium orthophosphate. In addition, the solution became yellow in color with longer exposure times, possibly due to the presence of chromate ions, as indicated by an increased chromium level detected by AAS.

show abstract

“…Clinical results with porous-coated joint implants can be satisfactory, but sintered bead technology has several disadvantages, including increased release of metal ions due to the large surface area (1,5,24,26), potential loss of coating (5, 43), and reduction in substrate fatigue strength due to the high temperatures inherent in manufacturing (32,34,49,55). While threedimensional ingrowth is theoretically possible with multiple layers of sintered beads, most retrieval studies have shown relatively poor bone growth into conventional porous coatings.…”

Section: Discussionmentioning

confidence: 99%

Influence of biomaterial surface texture on bone ingrowth in the rabbit femur

Friedman

Jing

et al. 1996

Journal Orthopaedic Research

View full text Add to dashboard Cite

The purpose of this study was to examine both the histologic and the mechanical characteristics of bone apposition to an experimental surface, arc-deposited titanium, in a rabbit model and to compare them with those of four previously studied surfaces: one layer of cobalt-chromium beads, three layers of cobalt-chromium beads, plasma-sprayed cobalt-chromium, and uncoated titanium alloy. Bilateral cylindrical implants were press-fit into the lateral femoral condyles of 70 adult New Zealand White rabbits, which were allowed unrestricted activity and then killed at 6 or 12 weeks. The distal femora were harvested, radiographed, and prepared for either mechanical or histologic evaluation. All of the implants with coated surfaces had significantly greater shear strength than the implants of grit-blasted titanium alloy after both 6 and 12 weeks. After 6 weeks, maximum bone apposition occurred in the beaded surfaces. After 12 weeks, the shear strengths and bone apposition of implants of arc-deposited titanium and of one and three layers of cobalt-chromium beads were significantly greater than those of implants of plasma-sprayed cobalt-chromium and grit-blasted titanium alloy. The histologic studies correlated with the mechanical results. After 12 weeks, the bone apposition and mechanical stability of arc-deposited titanium were similar to those of a single layer of beads. There appeared to be no advantage to multiple layers of beads, and the plasma-sprayed cobalt-chromium and grit-blasted titanium surfaces showed lower shear strength and bone apposition than the other groups.

show abstract

Loosening of the porous coating of bicompartmental prostheses in patients with rheumatoid arthritis.

Cited by 70 publications

References 0 publications

Surface roughness of retrieved CoCrMo alloy femoral components from PCA artificial total knee joints

Surface roughness of retrieved CoCrMo alloy femoral components from PCA artificial total knee joints

Effects of microstructure on the corrosion behavior of CoCr porous coatings on orthopedic implants

Influence of biomaterial surface texture on bone ingrowth in the rabbit femur

Contact Info

Product

Resources

About