Effect of swing phase load on metal-on-metal hip lubrication, friction and wear

Williams, Sophie; Jalali-Vahid, D.; Brockett, Claire; Zhang, Jin; Stone, Martin; Ingham, Eileen; Fisher, John

doi:10.1016/j.jbiomech.2005.07.011

Cited by 64 publications

(54 citation statements)

References 19 publications

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“…Acute dislocation and joint laxity with subluxations and microseparations can induce local and systemic release of chromium and cobalt particles (Williams et al 2006, Brown et al 2007). Simulator studies have shown that there is a substantial release of particles when microseparation is introduced into the gait cycle (Williams et al 2006).…”

Section: Discussionmentioning

confidence: 99%

Outcome and serum ion determination up to 11 years after implantation of a cemented metal-on-metal hip prosthesis

et al. 2009

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Background and purpose Little is known about the long-term outcome of cemented metal-on-metal hip arthroplasties. We evaluated a consecutive series of metal-on-metal polyethylene-backed cemented hip arthroplasties implanted in patients under 60 years of age.Methods 109 patients (134 joint replacements) were followed prospectively for mean 9 (7–11) years. The evaluation included clinical score, radiographic assessment, and blood sampling for ion level determination.Results At the final review, 12 hips had been revised, mainly because of aseptic loosening of the socket. Using revision for aseptic loosening as the endpoint, the survival rate at 9 years was 91% for the cup and 99% for the stem. In addition, 35 hips showed radiolucent lines at the bone-cement interface of the acetabulum and some were associated with osteolysis. The median serum cobalt and chromium levels were relatively constant over time, and were much higher than the detection level throughout the study period. The cobalt level was 1.5 μg/L 1 year after implantation, and 1.44 μg/L 9 years after implantation.Interpretation Revisions for aseptic loosening and radiographic findings in the sockets led us to halt metal-on-metal-backed polyethylene cemented hip arthroplasty procedures. If the rigidity of the cemented socket is a reason for loosening, excessive release of metal ions and particles may be involved. Further investigations are required to confirm this hypothesis and to determine whether subluxation, microseparation, and hypersensitivity also play a role.

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Section: Discussionmentioning

confidence: 99%

Outcome and serum ion determination up to 11 years after implantation of a cemented metal-on-metal hip prosthesis

et al. 2009

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“…Friction measurements were performed with swing phase loads of 25, 100, and 300 N. A previous study 39 including theoretical analysis has predicted a reduced fluid film thickness with increasing swing phase load, which may be associated with less effective entrainment of fluid during the swing phase of the gait cycle. Studies with MoM implants demonstrated increases in both friction and wear with increase in swing phase load.…”

Section: Discussionmentioning

confidence: 99%

Friction of total hip replacements with different bearings and loading conditions

et al. 2006

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Metal-on-ultra-high molecular weight polyethylene (UHMWPE) total hip replacements have been the most popular and clinically successful implants to date. However, it is well documented that the wear debris from these prostheses contributes to osteolysis and ultimate failure of the prosthesis, hence alternative materials have been sought. A range of 28 mm diameter bearings were investigated using a hip friction simulator, including conventional material combinations such as metal-on-UHWMPE, ceramic-on-ceramic (CoC), and metal-on-metal (MoM), as well as novel ceramic-on-metal (CoM) pairings. Studies were performed under different swing-phase load and lubricant conditions. The friction factors were lowest in the ceramic bearings, with the CoC bearing having the lowest friction factor in all conditions. CoM bearings also had low friction factors compared with MoM, and the trends were similar to CoC bearings for all test conditions. Increasing swing phase load was shown to cause an increase in friction factor in all tests. Increased serum concentration resulted in increased friction factor in all material combinations, except MoM, where increased serum concentration produced a significant reduction in friction factor.

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“…These moments are not only determined by the patient’s activities and, thus, the frequency and magnitude of the contact forces but also by the amount of friction in the joint. In vitro studies using different test conditions [7–18] demonstrated that the materials of the implant head and inlay primarily influenced the friction. In several studies, the stability of cup-bone bonding was investigated in cadavers or using plastic bone substitutes.…”

Section: Introductionmentioning

confidence: 99%

In vivo measured joint friction in hip implants during walking after a short rest

Damm¹,

Bender²,

Duda³

et al. 2017

PLoS ONE

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IntroductionIt has been suspected that friction in hip implants is higher when walking is initiated after a resting period than during continuous movement. It cannot be excluded that such increased initial moments endanger the cup fixation in the acetabulum, overstress the taper connections in the implant or increase wear. To assess these risks, the contact forces, friction moments and friction coefficients in the joint were measured in vivo in ten subjects. Instrumented hip joint implants with telemetric data transmission were used to access the contact loads between the cup and head during the first steps of walking after a short rest.ResultsThe analysis demonstrated that the contact force is not increased during the first step. The friction moment in the joint, however, is much higher during the first step than during continuous walking. The moment increases throughout the gait cycle were 32% to 143% on average and up to 621% individually. The high initial moments will probably not increase wear by much in the joint. However, comparisons with literature data on the fixation resistance of the cup against moments made clear that the stability can be endangered. This risk is highest during the first postoperative months for cementless cups with insufficient under-reaming. The high moments after a break can also put taper connections between the head and neck and neck and shaft at a higher risk.DiscussionDuring continuous walking, the friction moments individually were extremely varied by factors of 4 to 10. Much of this difference is presumably caused by the varying lubrication properties of the synovia. These large moment variations can possibly lead to friction-induced temperature increases during walking, which are higher than the 43.1°C which have previously been observed in a group of only five subjects.

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Effect of swing phase load on metal-on-metal hip lubrication, friction and wear

Cited by 64 publications

References 19 publications

Outcome and serum ion determination up to 11 years after implantation of a cemented metal-on-metal hip prosthesis

Outcome and serum ion determination up to 11 years after implantation of a cemented metal-on-metal hip prosthesis

Friction of total hip replacements with different bearings and loading conditions

In vivo measured joint friction in hip implants during walking after a short rest

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