Coulomb frictional interfaces in modeling cemented total hip replacements: A more realistic model

Mann, Kenneth A.; Bartel, Donald L.; Wright, Timothy M.; Burstein, Albert H.

doi:10.1016/0021-9290(94)00158-z

Cited by 89 publications

(66 citation statements)

References 21 publications

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“…In fact, the hypothesis stating that debonded stems with high surface roughness values would damage the cement mantle to a lesser extent as compared to polished ones, as posed in the introduction, was contradicted. This seems to oppose result as produced by FEA studies [3][4][5][6]. However, FEA studies generally simulate variation of friction without changing the surface roughness.…”

Section: Discussionmentioning

confidence: 93%

“…Laboratory experiments [2] and finite element analysis (FEA) studies [3][4][5][6] have demonstrated Fig 1. (Left) Using a brass metal mould (1), the tapers (2) with circular cross sections were implanted in a cement mantle (3). The mould was closed by a Delrin stopper (4).…”

Section: Introductionmentioning

confidence: 99%

“…The alternative to this concept is to accept that stem-cement debonding does occur, and minimize its effect. Recent finite element analyses indicate that this can be accomplished by increasing stem-cement interface friction [6,10]. Increased stem-cement friction limits the effects of stem debonding by reducing the cement stresses and stem subsidence, and therefore represses the damage accumulation failure scenario.…”

Section: Introductionmentioning

confidence: 99%

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Surface roughness of debonded straight-tapered stems in cemented THA reduces subsidence but not cement damage

Verdonschot

Huiskes

1998

Biomaterials

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Although stress analyses have shown that the mechanical endurance of cemented femoral THA reconstructions is served by stems that firmly bond to their cement mantles, retrieval studies suggest that this may be difficult to achieve. Clinical studies with roentgen stereophotogrammetric analyses have shown that stems may gradually debond from their cement mantle. Accepting the fact that stem debonding is unavoidable, stem subsidence and cement stresses can be reduced by increasing stem-cement friction, as indicated by finite element stress analyses. Hence, it can be hypothesized that debonded stems with high surface roughness values would damage the cement mantle to a lesser extent as compared to polished ones. To confirm this hypothesis, tapered stems with polished and rough surface finishes were implanted in cement mantles and cyclically loaded for 1.7 million times. It was investigated how surface roughness affected the damage in the cement mantle, and how it was related to prosthetic subsidence.The polished taper subsided considerably more than the rough one (630 vs. 270 m at the end of the experiments). In addition, it was found that the polished taper displayed step-wise subsidence, which is probably due to the interaction of stick-slip processes at the interface, associated with creep of the acrylic cement. The rough taper subsided monotonously. Scanning Electron Microscopic (SEM) analysis of the taper-cement structures showed that the rough taper was completely debonded from the cement mantle, creating a gap at the interface, and that many large cement cracks and particles were created. Around the polished taper, only a few cracks were found and the taper-cement interface seemed undamaged.It was concluded that an increased surface roughness does not necessarily lead to a reduction in cement damage. On the contrary, compared to polished ones, debonded rough stems may produce more cement cracks and acrylic cement debris, and provide routes to transport these wear products. Hence, after failure of the stem-cement interface, straight-tapered stems with an increased surface roughness accelerate the failure process due to inferior fail-safe features. Consequently, in vivo subsidence patterns at the stem-cement interface should be considered in combination with the surface finish of the implant. An amount of post-operative subsidence of a rough stem may be much more damaging for the reconstruction than the same amount for a polished stem.

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Section: Discussionmentioning

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Surface roughness of debonded straight-tapered stems in cemented THA reduces subsidence but not cement damage

Verdonschot

Huiskes

1998

Biomaterials

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“…(A) (B) [13] Cancellous bone -screw 0.5 [14] Fracture plane 0.5 [15] In fact, the peak von Mises stresses (PVMS) of 27MPa was aspsessed at the screw-bone junction in the cancellous bone with NC. This exceeded its yield strength of 22MPa suggesting the likelihood of micro-fracture in this region.…”

Section: Resultsmentioning

confidence: 99%

“…Rather we took it as continuity (i.e., the nodes are shared) and no micromotion was assessed here. It should be noted that at the interface between screw and cement, we adopted the friction coefficient value of 0.3 as suggested by Mann et al [13], which was lower than the that of screw-bone interface (µ = 0.5, suggested by Shrazi-Adl et al [14]). The initial micromotion assessed immediately after surgery has been cited as one of the indicators whether successful bony healing can take place.…”

Section: Discussionmentioning

confidence: 99%

Biomechanics of Bone Cement Augmentation with Compression Hip Screw System for the Treatment of Intertrochanteric Fractures

Lee

Kim

Kwon

et al. 2004

Computational Science - ICCS 2004

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Abstract.Recently, cement augmentation technique was introduced to enhance screw fixation within the femoral head. This study investigates biomechanical efficacies of cement augmentation technique. Finite element models of the femur with sliding hip screw assemblies were constructed with and without bone cement augmentation. Appropriate contact conditions with varying friction coefficients were assigned to simulate the fracture planes and other interfacial regions. With cement augmentation, 80% reduction in stresses was found in the cancellous bone, suggesting reduced possibility of cancellous bone fracture and screw cut-outs. The peak von Mises stress within the cement mantle was about 1/3 of its fatigue strength, which suggested the longevity of the cement mantle and less likelihood of osteolysis due to cement debris. Micromotions at the hip screw interfaces were also dwon from 0.275mm to 0.008mm, an indication for strong fixation after the surgery.

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Effects of prosthesis surface roughness on the failure process of cemented hip implants after stem-cement debonding

Verdonschot

Tanck

Huiskes

1998

J. Biomed. Mater. Res.

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Retrieval studies suggest that the loosening process of the cemented femoral components of total hip arthroplasties is initiated by failure of the bond between the prosthesis and the cement mantle. Finite element (FE) analyses have demonstrated that stem-cement debonding has stress-producing effects in the cement mantle. High interface friction, which corresponds to a degree of surface roughness, reduces these stresses. In experiments, however, debonded rough stems produced more cement damage than polished ones; in the Swedish Hip Register polished stems were clinically superior with respect to stems with a mat surface finish. The purpose of the present study was to investigate this contradiction. For this purpose, global and local FE models with debonded stem-cement interfaces were used to study the effects of prosthesis surface roughness on the cement stresses on a global scale and microscale, respectively. Similar to earlier numerical studies, the global FE model predicted that an increased surface roughness of the stem reduced the stresses in the cement mantle. The local model provided insight in the load-transfer mechanism on a microscale and could explain the experimental and clinical findings. The local cement peak stresses around the asperities of the surface roughness profile increased with increasing surface roughness and decreased again beyond a particular roughness value. Cement abrasion is caused by localized stresses in combination with micromotion. From this study it can be concluded that to minimize cement abrasion, debonded stems should either have a polished microstructure to minimize the local cement stresses or have a profiled macrostructure to minimize micromotions at the stem-cement interface.

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Coulomb frictional interfaces in modeling cemented total hip replacements: A more realistic model

Cited by 89 publications

References 21 publications

Surface roughness of debonded straight-tapered stems in cemented THA reduces subsidence but not cement damage

Surface roughness of debonded straight-tapered stems in cemented THA reduces subsidence but not cement damage

Biomechanics of Bone Cement Augmentation with Compression Hip Screw System for the Treatment of Intertrochanteric Fractures

Effects of prosthesis surface roughness on the failure process of cemented hip implants after stem-cement debonding

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