Corrosion at the Interface of Cobalt-Alloy Heads on Titanium-Alloy Stems

Collier, John; Surprenant, Victor A.; Jensen, Robert E.; Mayor, Michael B.

doi:10.1097/00003086-199110000-00042

Cited by 165 publications

(79 citation statements)

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“…Crevice corrosion at the head-spigot interface of retrieved modular femoral components with a taper-fit method of head attachment has recently been detected (Collier et al 1991, Mathiesen et al 1991. In our study also, corrosion was detected at the interface.…”

Section: Taper-fit Attachmentsupporting

confidence: 72%

Wear of the polyethylene acetabular cup: Metallic and ceramic heads compared in a hip simulator

Saikko¹,

Paavolainen

Slätis

1993

Acta Orthopaedica Scandinavica

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and modular alumina ceramic femoral heads for 3 million walking cycles. The mean wear rate of cups against alumina heads (range 0-5.7 mg/1 O6 cycles, corresponding to 06.008 mdyear) was usually lower than against metallic heads (range 3.9-178 mg/106 cycles, corresponding to 0.005-0.24 mdyear). In the . _ _ _~ __ Vesa 0 Saikko', Pekka 0 Paavolainen2 and Par Slatis2 ___ metal-head prostheses, the mean wear rate was highest against stainless steel heads, and lowest against ion-implanted Ti-6AI-4V heads.As the wear rates are compared with published clinical observations, it can be concluded that the hip joint simulator is capable of producing realistic wear rates; it is a useful instrument in the study of the wear behavior of new designs, materials, surface treatments and coatings prior to clinical trials. However, the taper-fit attachment of modular heads proved problematical, showing corrosion and wear at the conical head-spigot interface.

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Section: Taper-fit Attachmentsupporting

confidence: 72%

Wear of the polyethylene acetabular cup: Metallic and ceramic heads compared in a hip simulator

Saikko¹,

Paavolainen

Slätis

1993

Acta Orthopaedica Scandinavica

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“…When the elastic modulus was held constant across all taper geometries to examine only the effects of taper geometry on flexural rigidity, we found there was still substantial variability among the different designs. Early retrieval analyses were particularly concerning for the potential for corrosion with stems with a 6°taper [9,10,13], which is a small design with low flexural rigidity. This taper geometry was associated with some of the least rigid trunnions in our study (Tables 4, 5).…”

Section: Discussionmentioning

confidence: 99%

Modern Trunnions Are More Flexible: A Mechanical Analysis of THA Taper Designs

Porter

Urban

Jacobs

et al. 2014

Clin Orthop Relat Res

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Background There is renewed concern surrounding the potential for corrosion at the modular head-neck junction to cause early failure in contemporary THAs. Although taper corrosion involves a complex interplay of many factors, a previous study suggested that a decrease in flexural rigidity of the femoral trunnion may be associated with an increased likelihood of corrosion at retrieval. Questions/purposes By analyzing a large revision retrieval database of femoral stems released during a span of three decades, we asked: (1) how much does flexural rigidity vary among different taper designs; (2) what is the contribution of taper geometry alone to flexural rigidity of the femoral trunnion; and (3) how have flexural rigidity and taper length changed with time in this group of revised retrievals? Methods A dual-center retrieval analysis of 85 modular femoral stems released between 1983 and 2012 was performed, and the flexural rigidity and length of the femoral trunnions were determined. These stems were implanted between 1991 and 2012 and retrieved at revision or removal surgery between 2004 and 2012. There were 10 different taper designs made from five different metal alloys from 16 manufacturers. Digital calipers were used to measure taper geometries by two independent observers. Results Median flexural rigidity was 228 N-m 2 ; however, there was a wide range of values among the various stems spanning nearly an order of magnitude between the most

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“…[1][2][3][4][5][6][7][8][9][10][11][12] Initially, corrosion was thought to result from a galvanic process due to the coupling of Ti-6Al-4V alloy with CoCrMo alloy. 2 This hypothesis was rejected by the finding of comparable corrosion products in similar alloy (CoCrMo/CoCrMo) couples. Gilbert et al found evidence of moderate to severe corrosion in 16% of necks and 35% of heads in mixed metal couples, and 14% of necks and 23% of heads in similar metal couples, in a retrieval study of 148 modular hip implants of several designs.…”

Section: Introductionmentioning

confidence: 99%

Effect of impact assembly on the fretting corrosion of modular hip tapers

Mroczkowski¹,

Hertzler²,

Humphrey³

et al. 2005

Journal Orthopaedic Research

112

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The goal of this study was to determine the effect of assembly load and local assembly environmental conditions on the fretting corrosion of modular femoral stem tapers. Femoral head/ taper assemblies in both similar (CoCrMo/CoCrMo) and mixed (CoCrMo/Ti-6Al-4V) alloy combinations were evaluated using an electrochemical test method. Specimens were assembled under impact loading and by hand, in both wet and dry conditions. Incremental cyclic loads ranging from 89 to 5,340 N were applied at a frequency of 3 Hz in Ringer's solution at ambient temperature. During the test, both the open circuit potential (OCP) and fretting current (i fret ) were measured using a saturated calomel electrode (SCE) and counter electrode, respectively. The results were comparable for both mixed and similar alloy couples. Decreases in OCP and increases in i fret (indicators of oxide film fracture and repassivation) were seen with increasing load magnitude, often occurring at loads well below those expected clinically. OCP at the 5,340 N cyclic load ranged from À30.4 to À103.7 mV versus SCE for similar alloy couples, and À19.1 to À181.4 mV versus SCE for mixed alloy couples. Mean peak fretting currents ranged from 0.84 to 1.42 mA and 1.06 to 3.12 mA for similar and mixed alloy couples, respectively. The larger current magnitudes and more negative shifts in OCP for mixed alloy couples indicate the difference in oxide film fracture behavior between titanium and cobalt alloys. The load at which OCP began to drop (onset of fretting) was dependent upon the assembly conditions for both material couples. Specimens assembled with impact loads in air showed the highest resistance to fretting. The results of this study indicate that the assembly load and the environment both play a role in the initial stability of modular hip taper connections.

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Corrosion at the Interface of Cobalt-Alloy Heads on Titanium-Alloy Stems

Cited by 165 publications

References 0 publications

Wear of the polyethylene acetabular cup: Metallic and ceramic heads compared in a hip simulator

Wear of the polyethylene acetabular cup: Metallic and ceramic heads compared in a hip simulator

Modern Trunnions Are More Flexible: A Mechanical Analysis of THA Taper Designs

Effect of impact assembly on the fretting corrosion of modular hip tapers

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