The number of screws, bone quality, and friction coefficient affect acetabular cup stability

Hsu, Jung-Mao; Chang, Chih Han; Huang, Hsuan‐Jung; Zobitz, Mark E.; Chen, Weng Pin; Lai, Kuo-An; An, Kai Nan

doi:10.1016/j.medengphy.2006.11.005

Cited by 96 publications

(83 citation statements)

References 22 publications

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“…The results obtained in Fig. 10 indicate that the impact momentum is correlated to the contact area, which is an important parameter for the implant success [6,30]. These results indicate that the impact momentum may constitute an important parameter to determine the insertion condition of the AC implant because it is related to the contact area.…”

Section: Discussionmentioning

confidence: 76%

“…However, failures still occur [2] and may have dramatic consequences such as pain, additional surgery and immobilization periods [3][4][5]. Aseptic loosening has been identified as one of the most current causes of implant failure [6,7] and may be related to the implant primary stability, which is determinant for the quality of osseointegration phenomena [8]. A compromise must be found between i) a sufficient primary stability necessary to reduce the relative micromotions at the bone-implant interface, which may lead to the formation of fibrous tissue around the implant [9] and ii) excessive stresses around the implant, which may lead to bone tissue necrosis [10].…”

Section: Introductionmentioning

confidence: 99%

“…The AC implant stability has also been assessed in simulation studies through the measurement of relative micromotion occurring at the bone-implant interface during simulated gait cycles or others daily activities [6,16,17] or using other biomechanical tests such as push-in [18], pull-out and edge loading tests [19]. Experimental methods have been developed to assess the femoral stem stability [20, Finite element model of the impaction of a press-fitted acetabular cup: estimation of the contact area.…”

Section: Introductionmentioning

confidence: 99%

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Finite element model of the impaction of a press-fitted acetabular cup

Michel

Nguyen

Bosc

et al. 2016

Med Biol Eng Comput

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Finite element model of the impaction of a press-fitted acetabular cup: estimation of the contact area. Finite element model of the impaction of a press-fitted acetabular cup: estimation of the contact area. 2 AbstractPress-fit surgical procedures aim at providing primary stability to acetabular cup (AC) implants. Impact analysis constitutes a powerful approach to retrieve the AC implant insertion properties. The aim of this numerical study was to investigate the dynamic interaction occurring between the hammer, the ancillary and bone tissue during the impact and to assess the potential of impact analysis to retrieve AC implant insertion conditions. A dynamic two-dimensional axisymmetric model was developed to simulate the impaction of the AC implant into bone tissue assuming friction at the bone-implant interface and large deformations. Different values of interference fit (from 0.5 to 2 mm) and impact velocities (from 1 to 2 m.s -1 ) were considered. For each configuration, the variation of the force applied between the hammer and the ancillary was analyzed and an indicator I was determined based on the impact momentum of the signal.The simulated results are compared to the experiments. The value of the polar gap decreases versus the impact velocity and increases versus the interference fit. The bone implant contact area was significantly correlated with the resonance frequency (R 2 =0.94) and the indicator (R 2 =0.95).The results show the potential of impact analyses to retrieve the bone-implant contact properties.Keywords: Acetabular cup; hip replacement; impact; finite element; bone; Biomechanics; bone Author Biographies:Adrien Michel has completed his PhD in biomechanics in the MSME laboratory. Romain Bosc and Philippe Hernigou are experienced surgeons. Vu-Hieu Nguyen and Salah Naili are experts in mechanical modeling and simulation. Romain Vayron and Guillaume Haiat are specialized in biomechanical engineering of implants.Finite element model of the impaction of a press-fitted acetabular cup: estimation of the contact area.3

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Section: Discussionmentioning

confidence: 76%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Finite element model of the impaction of a press-fitted acetabular cup

Michel

Nguyen

Bosc

et al. 2016

Med Biol Eng Comput

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“…The stability of the acetabular component also could be affected by bone quality and bone stock [5,15]. Multiplescrew fixation could also affect micromotion of the acetabular component in situations where the host bone quality is poor or acetabular deficiency is severe.…”

Section: Discussionmentioning

confidence: 99%

Effect of screw fixation on acetabular component alignment change in total hip arthroplasty

Fujishiro

Hayashi

Kanzaki

et al. 2014

International Orthopaedics (SICOT)

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Purpose The use of screws can enhance immediate cup fixation, but the influence of screw insertion on cup position has not previously been measured. The purpose of this study was to quantitatively evaluate the effect of intra-operative screw fixation on acetabular component alignment that has been inserted with the use of a navigation system. Methods We used a navigation system to measure cup alignment at the time of press-fit and after screw fixation in 144 hips undergoing total hip arthroplasty. We also compared those findings with factors measured from postoperative radiographs. Results The mean intra-operative change of cup position was 1.78°for inclination and 1.81°for anteversion. The intraoperative change of anteversion correlated with the number of screws. The intra-operative change of inclination also correlated with medial hip centre. Conclusion The insertion of screws can induce changes in cup alignment, especially when multiple screws are used or if a more medial hip centre is required for rigid acetabular fixation.

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“…Therefore, many studies have directly assessed cadavers in an invasive manner [8,11,12,[19][20][21]. In contrast to cadaver-based studies, CT imaging is a useful approach to obtaining spatial information on bony structures in vivo [18,22]. The present study evaluated the morphology of the mandibular fossa using CT in an Asian population.…”

Section: Discussionmentioning

confidence: 99%

Assessments of inclinations of the mandibular fossa by computed tomography in an Asian population

Shen

Chen

et al. 2011

Clin Oral Invest

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This study aims to evaluate the inclinations of right and left sides the mandibular fossa in Asian population using computed tomography (CT) images and determine its effects according to the parameters of gender, age, and asymmetry. CT images of the heads of 198 Asian subjects [95 females aged 44.2 ± 20.7 years, range 11-88 years; and 103 males aged 44.5 ± 19.7 years, range 15-98 years] were selected. The following eight parameters characterizing the inclinations of the mandibular fossa were measured by medical imaging software: anterior and posterior inclinations on the left and right sides on a sagittal view, and medial and lateral inclinations on the left and right sides on a coronal view. The anterior inclination was significant steeper in males than in females on both the left and right sides. A moderate positive correlation was found between age and anterior inclinations on the left and right sides. None of the other parameters were significantly affected by age or gender. None of the parameters differed significantly between the right and left sides of the mandibular fossa in males, females, or all subjects. The anterior inclination of the mandibular fossa was affected by aging and gender becoming steeper in Asians males than females. Besides, there were no asymmetry in the right and left side inclinations of the mandibular fossa.

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The number of screws, bone quality, and friction coefficient affect acetabular cup stability

Cited by 96 publications

References 22 publications

Finite element model of the impaction of a press-fitted acetabular cup

Finite element model of the impaction of a press-fitted acetabular cup

Effect of screw fixation on acetabular component alignment change in total hip arthroplasty

Assessments of inclinations of the mandibular fossa by computed tomography in an Asian population

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